In public health, social distancing, also called physical distancing, is a set of non-pharmaceutical interventions or measures intended to prevent the spread of a contagious disease by maintaining a physical distance between people and reducing the number of times people come into close contact with each other. It typically involves keeping a certain distance from others (the distance specified may differ from time to time and country to country) and avoiding gathering together in large groups.
By minimising the probability that a given uninfected person will come into physical contact with an infected person, the disease transmission can be suppressed, resulting in fewer deaths. The measures may be used in combination with others, such as good respiratory hygiene, face masks and hand washing. During the COVID-19 pandemic, the World Health Organization (WHO) suggested favoring the term "physical distancing" as opposed to "social distancing", as it is a physical separation which prevents transmission; people can remain socially connected via technology. To slow down the spread of infectious diseases and avoid overburdening healthcare systems, particularly during a pandemic, several social-distancing measures are used, including the closing of schools and workplaces, isolation, quarantine, restricting the movement of people and the cancellation of mass gatherings.
Although the term was introduced only in the 21st century, social-distancing measures date back to at least the 5th century BC. The Bible contains one of the earliest known references to the practice in the Book of Leviticus 13:46: "And the leper in whom the plague is... he shall dwell alone; [outside] the camp shall his habitation be." During the Plague of Justinian of 541 to 542, Emperor Justinian enforced an ineffective quarantine on the Byzantine Empire, including dumping bodies into the sea; he predominantly blamed the widespread outbreak on "Jews, Samaritans, pagans, heretics, Arians, Montanists and homosexuals". In modern times, social distancing measures have been successfully implemented in several epidemics. In St. Louis, shortly after the first cases of influenza were detected in the city during the 1918 flu pandemic, authorities implemented school closures, bans on public gatherings and other social-distancing interventions. The influenza fatality rates in St. Louis were much less than in Philadelphia, which had fewer cases of influenza but allowed a mass parade to continue and did not introduce social distancing until more than two weeks after its first cases. Authorities have encouraged or mandated social distancing during the COVID-19 pandemic.
Social distancing measures are most effective when the infectious disease spreads via one or more of the following methods:
- droplet contact (coughing or sneezing)
- direct physical contact (including sexual contact)
- indirect physical contact (such as by touching a contaminated surface)
- airborne transmission (if the microorganism can survive in the air for long periods); the efficacy of social distancing to contain airborne viruses compared to other measures, such as widespread mask usage, is disputed[better source needed]
The Centers for Disease Control and Prevention (CDC) have described social distancing as a set of "methods for reducing frequency and closeness of contact between people in order to decrease the risk of transmission of disease". During the 2009 flu pandemic the WHO described social distancing as "keeping at least an arm's length distance from others, [and] minimizing gatherings". It is combined with good respiratory hygiene and hand washing, and is considered the most feasible way to reduce or delay a pandemic.
During the COVID-19 pandemic, the CDC revised the definition of social distancing as "remaining out of congregate settings, avoiding mass gatherings, and maintaining distance (approximately six feet or two meters) from others when possible". The WHO prefers the term physical distancing. It is not clear why six feet was chosen. Recent studies have suggested that droplets from a sneeze or forceful breathing during exercise can travel over six meters. Some have suggested the required distance is based on debunked research from the 1930s and 1940s or confusion regarding units of measurement. Researchers and science writers have recommended that larger social distances and/or both mask wearing and social distancing be required.
Several social distancing measures are used to control the spread of contagious illnesses. Research indicates that measures must be applied rigorously and immediately in order to be effective.
Avoiding physical contactEdit
Keeping a set physical distance from each other and avoiding hugs and gestures that involve direct physical contact, reduce the risk of becoming infected during outbreaks of infectious respiratory diseases (for example, flu pandemics and the COVID-19 pandemic of 2020.) These distances of separation, in addition to personal hygiene measures, are also recommended at places of work. Where possible it may be recommended to work from home.
The distance advised by authorities can vary. During the COVID-19 pandemic, for example, the World Health Organization recommends that a distance of 1 m (3.3 ft) or more is safe. Subsequently, China, Denmark, Hong Kong, Lithuania and Singapore adopted a 1 m social distancing policy. South Korea adopted 1.4 m (4 ft 7 in). Australia, Belgium, Germany, Greece, Italy, Netherlands, Portugal and Spain adopted 1.5 m (4.9 ft). The United States adopted 6 ft (1.8 m) distancing, and Canada adopted a policy of 2 m (6.6 ft) distancing. While the United Kingdom first advised a distance of at least 2 m, this was reduced to a "1m+" policy from July 4, 2020, reducing the safe distance to 1 m (3.3 ft), where other methods to mitigate virus transmission, for example face masks or plastic screens, were in place.
The WHO's one-meter recommendation stems from research into droplet-based transmission of tuberculosis by William F. Wells, which had found that droplets produced by exhalation, coughs, or sneezes landed an average of 3 ft (0.91 m) from where they were expelled. Quartz speculated that the U.S. CDC's adoption of 6 ft (1.8 m) may have stemmed from a study of SARS transmission on an airplane, published in The New England Journal of Medicine. When contacted, however, the CDC did not provide any specific information.
Various alternatives have been proposed for the tradition of handshaking. The gesture of namaste, placing one's palms together, fingers pointing upwards, drawing the hands to the heart, is one non-touch alternative. During the COVID-19 pandemic in the United Kingdom, this gesture was used by Prince Charles upon greeting reception guests, and has been recommended by the Director-General of the WHO, Dr. Tedros Adhanom Ghebreyesus, and Israeli Prime Minister Benjamin Netanyahu. Other alternatives include the popular thumbs up gesture, the wave, the shaka (or "hang loose") sign, and placing a palm on your heart, as practiced in parts of Iran.
Floor markings can help people maintain distance in public places, especially when queueing.
Mathematical modeling has shown that transmission of an outbreak may be delayed by closing schools. However, effectiveness depends on the contacts children maintain outside of school. Often, one parent has to take time off work, and prolonged closures may be required. These factors could result in social and economic disruption.
Modeling and simulation studies based on U.S. data suggest that if 10% of affected workplaces are closed, the overall infection transmission rate is around 11.9% and the epidemic peak time is slightly delayed. In contrast, if 33% of affected workplaces are closed, the attack rate decreases to 4.9%, and the peak time is delayed by one week. Workplace closures include closure of "non-essential" businesses and social services ("non-essential" means those facilities that do not maintain primary functions in the community, as opposed to essential services).
Canceling mass gatheringsEdit
Cancellation of mass gatherings includes sports events, films or musical shows. Evidence suggesting that mass gatherings increase the potential for infectious disease transmission is inconclusive. Anecdotal evidence suggests certain types of mass gatherings may be associated with increased risk of influenza transmission, and may also "seed" new strains into an area, instigating community transmission in a pandemic. During the 1918 influenza pandemic, military parades in Philadelphia and Boston may have been responsible for spreading the disease by mixing infected sailors with crowds of civilians. Restricting mass gatherings, in combination with other social distancing interventions, may help reduce transmission. A recent peer-reviewed study in the British Medical Journal (BMJ) also suggested it as one of the key components of an effective strategy in reducing the burden of COVID-19.
Border restrictions or internal travel restrictions are unlikely to delay an epidemic by more than two to three weeks unless implemented with over 99% coverage. Airport screening was found to be ineffective in preventing viral transmission during the 2003 SARS outbreak in Canada and the U.S. Strict border controls between Austria and the Ottoman Empire, imposed from 1770 until 1871 to prevent persons infected with the bubonic plague from entering Austria, were reportedly effective, as there were no major outbreaks of plague in Austrian territory after they were established, whereas the Ottoman Empire continued to suffer frequent epidemics of plague until the mid-nineteenth century.
A Northeastern University study published in March 2020 found that "travel restrictions to and from China only slow down the international spread of COVID-19 [when] combined with efforts to reduce transmission on a community and an individual level. [...] Travel restrictions aren't enough unless we couple it with social distancing." The study found that the travel ban in Wuhan delayed the spread of the disease to other parts of mainland China only by three to five days, although it did reduce the spread of international cases by as much as 80 percent.
Shielding measures for individuals include limiting face-to-face contacts, conducting business by phone or online, avoiding public places and reducing unnecessary travel. During the COVID-19 pandemic in the United Kingdom, shielding referred to special advisory measures put in place by the UK Government to protect those at the highest risk of serious illness from the disease. Until June 1, 2020, those shielding were strongly advised not to leave home for any reason at all, including essential travel, and to maintain a 2 m (6.6 ft) distance from anyone else in their household. Supermarkets quickly made priority grocery delivery slots available to those shielding, and the Government arranged for food boxes to be sent to those shielding who needed additional assistance, for example elderly people shielding on their own. This was gradually relaxed from June to allow shielders to spend more time outside, before being suspended indefinitely from August 1.
During the 2003 SARS outbreak in Singapore, approximately 8000 people were subjected to mandatory home quarantine and an additional 4300 were required to self-monitor for symptoms and make daily telephone contact with health authorities as a means of controlling the epidemic. Although only 58 of these individuals were eventually diagnosed with SARS, public health officials were satisfied that this measure assisted in preventing further spread of the infection. Voluntary self-isolation may have helped reduce transmission of influenza in Texas in 2009. Short and long-term negative psychological effects have been reported.
The objective of stay-at-home orders is to reduce day-to-day contact with between people and thereby reduce the spread of infection During the COVID-19 pandemic, early and aggressive implementation of stay-at-home orders was effective in "flattening the curve" and provided the much needed time for healthcare systems to increase their capacity while reducing the number of peak cases during the initial wave of illness. It is important for public health authorities to follow disease trends closely to re-implement appropriate social distancing policies, including stay-at-home orders, if secondary COVID-19 waves appear.
In 1995, a cordon sanitaire was used to control an outbreak of Ebola virus disease in Kikwit, Zaire. President Mobutu Sese Seko surrounded the town with troops and suspended all flights into the community. Inside Kikwit, the World Health Organization and Zaire's medical teams erected further cordons sanitaires, isolating burial and treatment zones from the general population and successfully containing the infection.
During the 1918 influenza epidemic, the town of Gunnison, Colorado, isolated itself for two months to prevent an introduction of the infection. Highways were barricaded and arriving train passengers were quarantined for five days. As a result of the isolation, no one died of influenza in Gunnison during the epidemic. Several other communities adopted similar measures.
Other measures include shutting down or limiting mass transit and closure of sport facilities (community swimming pools, youth clubs, gymnasiums). Due to the highly interconnected nature of modern transportation hubs, a highly contagious illness can achieve rapid geographic spread if appropriate mitigation measures are not taken early. Consequently, highly coordinated efforts must be put into place early during an outbreak to proactively monitor, detect, and isolate any potentially infectious individuals. If community spread is present, more aggressive measures may be required, up to and including complete cessation of travel in/out of a specific geographic area.
Leper colonies and lazarettos were established as a means of preventing the spread of leprosy and other contagious diseases through social distancing, until transmission was understood and effective treatments invented.
Two lepers denied entrance to town. Woodcut by Vincent of Beauvais, 14th century
New York City parks and playgrounds were closed during a 1916 polio epidemic.
Passenger without mask being refused boarding of a streetcar amid 1918 flu pandemic. (Seattle, Washington, 1918)
1916 New York City polio epidemicEdit
During the 1916 New York City polio epidemic, when there were more than 27,000 cases and more than 6,000 deaths due to polio in the United States, with more than 2,000 deaths in New York City alone, movie theaters were closed, meetings were cancelled, public gatherings were almost non-existent, and children were warned not to drink from water fountains, and told to avoid amusement parks, swimming pools and beaches.
Influenza, 1918 to presentEdit
During the influenza pandemic of 1918, Philadelphia saw its first cases of influenza on 17 September. The city continued with its planned parade and gathering of more than 200000 people on 28 September and over the subsequent three days, the city's 31 hospitals became fully occupied. During the week ending 16 October, over 4500 people died. Social distancing measures were introduced on 3 October, on the orders of St. Louis physician Max C. Starkloff, more than two weeks after the first case. Unlike Philadelphia, St. Louis experienced its first cases of influenza on 5 October and the city took two days to implement several social distancing measures, including closing schools, theatres, and other places where people get together. It banned public gatherings, including funerals. The actions slowed the spread of influenza in St. Louis and a spike in cases and deaths, as had happened in Philadelphia, did not occur. The final death rate in St. Louis increased following a second wave of cases, but remained overall less than in other cities. Bootsma and Ferguson analyzed social distancing interventions in sixteen U.S. cities during the 1918 epidemic and found that time-limited interventions reduced total mortality only moderately (perhaps 10–30%), and that the impact was often very limited because the interventions were introduced too late and lifted too early. It was observed that several cities experienced a second epidemic peak after social distancing controls were lifted, because susceptible individuals who had been protected were now exposed.
School closures were shown to reduce morbidity from the Asian flu by 90% during the 1957–1958 pandemic, and up to 50% in controlling influenza in the U.S., 2004–2008. Similarly, mandatory school closures and other social distancing measures were associated with a 29% to 37% reduction in influenza transmission rates during the 2009 flu epidemic in Mexico.
During the swine flu outbreak in 2009 in the UK, in an article titled "Closure of schools during an influenza pandemic" published in The Lancet Infectious Diseases, a group of epidemiologists endorsed the closure of schools to interrupt the course of the infection, slow the further spread and buy time to research and produce a vaccine. Having studied previous influenza pandemics including the 1918 flu pandemic, the influenza pandemic of 1957 and the 1968 flu pandemic, they reported on the economic and workforce effect school closure would have, particularly with a large percentage of doctors and nurses being women, of whom half had children under the age of 16. They also looked at the dynamics of the spread of influenza in France during French school holidays and noted that cases of flu dropped when schools closed and re-emerged when they re-opened. They noted that when teachers in Israel went on strike during the flu season of 1999–2000, visits to doctors and the number of respiratory infections dropped by more than a fifth and more than two fifths respectively.
During the SARS outbreak of 2003, social distancing measures such as banning large gatherings, closing schools and theaters, and other public places, supplemented public health measures such as finding and isolating affected people, quarantining their close contacts, and infection control procedures. This was combined with wearing masks for certain people. During this time in Canada, "community quarantine" was used to reduce transmission of the disease with moderate success.
During the COVID-19 pandemic, social distancing and related measures are emphasized by several governments as alternatives to an enforced quarantine of heavily affected areas. According to UNESCO monitoring, more than a hundred countries have implemented nationwide school closures in response to COVID-19, impacting over half the world's student population. In the United Kingdom, the government advised the public to avoid public spaces, and cinemas and theaters voluntarily closed to encourage the government's message.
With many people disbelieving that COVID-19 is any worse than the seasonal flu, it has been difficult to convince the public—especially teens and young adults—to voluntarily adopt social distancing practices. In Belgium, media reported a rave was attended by at least 300 before it was broken up by local authorities. In France, teens making nonessential trips are fined up to US$150. Beaches were closed in Florida and Alabama to disperse partygoers during spring break. Weddings were broken up in New Jersey and an 8 p.m. curfew was imposed in Newark. New York, New Jersey, Connecticut and Pennsylvania were the first states to adopt coordinated social distancing policies which closed down non-essential businesses and restricted large gatherings. Shelter in place orders in California were extended to the entire state on 19 March. On the same day Texas declared a public disaster and imposed statewide restrictions.
These preventive measures such as social-distancing and self-isolation prompted the widespread closure of primary, secondary, and post-secondary schools in more than 120 countries. As of 23 March 2020, more than 1.2 billion learners were out of school due to school closures in response to COVID-19. Given low rates of COVID-19 symptoms among children, the effectiveness of school closures has been called into question. Even when school closures are temporary, it carries high social and economic costs. However, the significance of children in spreading COVID-19 is unclear. While the full impact of school closures during the coronavirus pandemic are not yet known, UNESCO advises that school closures have negative impacts on local economies and on learning outcomes for students.
In early March 2020, the sentiment "Stay The Fuck Home" was coined by Florian Reifschneider, a German engineer and was quickly echoed by notable celebrities such as Taylor Swift, Ariana Grande and Busy Philipps in hopes of reducing and delaying the peak of the outbreak. Facebook, Twitter and Instagram also joined the campaign with similar hashtags, stickers and filters under #staythefhome, #stayhome, #staythefuckhome and began trending across social media. The website claims to have reached about two million people online and says the text has been translated into 17 languages.
Impact on mental healthEdit
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There are concerns that social distancing can have adverse affects on participants' mental health. It may lead to stress, anxiety, depression or panic, especially for individuals with preexisting conditions such as anxiety disorders, obsessive compulsive disorders, and paranoia. Widespread media coverage about a pandemic, its impact on economy, and resulting hardships may create anxiety. Change in daily circumstances and uncertainty about the future may add onto the mental stress of being away from other people.
People with autism also suffer impact from social distancing. Adjusting to a new routine can be stressful for everyone within the spectrum but especially for children who have trouble with change. Children with autism may not know what is going on or might not be able to express their fears and frustrations. They also may need extra support to understand what's expected of them in some situations. The adjustment to a new situation can lead to challenging behavior uncharacteristic of the autistic individual's true character. In some countries and demographics, teenagers and young adults within the autistic spectrum disorder (ASD) receive support services including special education, behavioral therapy, occupational therapy, speech services, and individual aides through school, but this can be a major challenge, particularly since many teenagers with ASD already have social and communication difficulties. Aggressive and self-injurious behaviors may increase during this time of fear and uncertainty.
Portrayal in literatureEdit
In his 1957 science fiction novel The Naked Sun, Isaac Asimov portrays a planet where people live with social distancing. They are spread out, miles from each other, across a sparsely-populated world. Communication is primarily through technology. A male and a female still need to engage in sex to make a baby, but it is seen as a dangerous, nasty chore. In contrast, when communication is through technology the situation is the reverse: there is no modesty, and casual nudity is frequent. The novel's point of departure is a murder: this seemingly idyllic world, in fact, has serious social problems.
From the perspective of epidemiology, the basic goal behind social distancing is to decrease the effective reproduction number, or , which in the absence of social distancing would equate to the basic reproduction number, i.e. the average number of secondary infected individuals generated from one primary infected individual in a population where all individuals are equally susceptible to a disease. In a basic model of social distancing, where a proportion of the population engages in social distancing to decrease their interpersonal contacts to a fraction of their normal contacts, the new effective reproduction number is given by:
Where the value of can be brought below 1 for sufficiently long, containment is achieved, and the number infected should decrease.
For any given period of time, the growth in the number of infections can be modeled as:
- is the number of infected individuals after incubation periods (5 days, in the case of COVID-19)
Using COVID-19 as an example, the following table shows the infection spread given:
- A: No social distance mitigation
- B: 50% reduction in social interaction
- C: 75% reduction in social interaction
(1 incubation period)
(6 incubation periods)
An empirical study published in July 2020 in The BMJ (British Medical Journal) analyzed data from 149 countries, and reported an average of 13% reduction in COVID-19 incidence after the implementation of social distancing policies.
- Maier, Benjamin F.; Brockmann, Dirk (2020-05-15). "Effective containment explains subexponential growth in recent confirmed COVID-19 cases in China". Science. 368 (6492): 742–746. doi:10.1126/science.abb4557. ("...initial exponential growth expected for an unconstrained outbreak.")
- Harris, Margaret; Adhanom Ghebreyesus, Tedros; Liu, Tu; Ryan, Michael "Mike" J.; Vadia; Van Kerkhove, Maria D.; Diego; Foulkes, Imogen; Ondelam, Charles; Gretler, Corinne; Costas (2020-03-20). "COVID-19" (PDF). World Health Organization. Archived (PDF) from the original on 2020-03-25. Retrieved 2020-03-29.
- Hensley, Laura (2020-03-23). "Social distancing is out, physical distancing is in – here's how to do it". Global News. Corus Entertainment Inc. Archived from the original on 2020-03-26. Retrieved 2020-03-29.
- Venske, Regula (2020-03-26). Schwyzer, Andrea (ed.). "Die Wirkung von Sprache in Krisenzeiten" [The effect of language in times of crisis] (Interview). NDR Kultur (in German). Norddeutscher Rundfunk. Archived from the original on 2020-03-27. Retrieved 2020-03-27. (NB. Regula Venske is president of the PEN Centre Germany.)
- Johnson, Carolyn Y.; Sun, Lena; Freedman, Andrew (2020-03-10). "Social distancing could buy U.S. valuable time against coronavirus". The Washington Post. Archived from the original on 2020-03-27. Retrieved 2020-03-11.
- Pearce, Katie (2020-03-13). "What is social distancing and how can it slow the spread of COVID-19?". The Hub. Johns Hopkins University. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- "Risk Assessment and Management". Centers for Disease Control and Prevention. 2020-03-22. Archived from the original on 2020-03-04. Retrieved 2020-03-29.
- "Pandemic influenza prevention and mitigation in low resource communities" (PDF). World Health Organization. 2009-05-02. Retrieved 2020-03-29.
- "Guidance on social distancing for everyone in the UK". GOV.UK. Archived from the original on 2020-03-24. Retrieved 2020-03-29.
- Tangermann, Victor (2020-03-24) [20 March 2020]. "It's Officially Time to Stop Using The Phrase 'Social Distancing'". science alert (Futurism / The Byte). Archived from the original on 2020-03-26. Retrieved 2020-03-29. 
- Kumar, Satyendra (2020-03-28). "Corona Virus Outbreak: Keep Physical Distancing, Not Social Distancing". Rochester, NY. SSRN 3568435. Cite journal requires
- Kinlaw, Kathy; Levine, Robert J. (2007-02-15). "Ethical guidelines in Pandemic Influenza—Recommendations of the Ethics Subcommittee of the Advisory Committee to the Director, Centers for Disease Control and Prevention" (PDF). Centers for Disease Control and Prevention. Archived (PDF) from the original on 2020-02-05. Retrieved 2020-03-23. (12 pages)
- "social distancing". Merriam-Webster. Retrieved 2020-05-07.
- "Bible Gateway passage: Leviticus 13 - Authorized (King James) Version". Bible Gateway.
- Drews, Kelly (2013-05-01). "A Brief History of Quarantine". The Virginia Tech Undergraduate Historical Review. 2. doi:10.21061/vtuhr.v2i0.16. ISSN 2165-9915.
- Ryan, Jeffrey R. (2008-08-01). "Chapter 6.3.3. Response and Containment: Lessons from the 1918 Pandemic Can Help Communities Today". Pandemic Influenza: Emergency Planning and Community Preparedness. CRC Press. pp. 123–133 . ISBN 978-1-4200-6088-1. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Zhang, Renyi; Li, Yixin; Zhang, Annie L.; Molina, Mario J. (2020-06-11). "Identifying airborne transmission as the dominant route for the spread of COVID-19". Proceedings of the National Academy of Sciences. doi:10.1073/pnas.2009637117. Retrieved 2020-06-13.
- "Interim Pre-Pandemic Planning Guidance: Community Strategy for Pandemic Influenza Mitigation in the United States – Early, Targeted, Layered Use of Nonpharmaceutical Interventions" (PDF). Centers for Disease Control and Prevention. February 2007. CS10848. Archived (PDF) from the original on 2020-03-19. Retrieved 2020-03-29.
- Brooks, Samantha K.; Webster, Rebecca K.; Smith, Louise E.; Woodland, Lisa; Wessely, Simon; Greenberg, Neil; Rubin, Gideon James (2020-03-14). "The psychological impact of quarantine and how to reduce it: rapid review of the evidence". The Lancet. 395 (10227): 912–920. doi:10.1016/S0140-6736(20)30460-8. ISSN 0140-6736. PMC 7158942. PMID 32112714. Archived from the original on 2020-03-13. Retrieved 2020-03-20.
- "Winning together: Novel coronavirus (COVID-19) infographic". ResearchGate. Retrieved 2020-05-16.
- Xie, X.; Li, Y.; Chwang, A. T.; Ho, P. L.; Seto, W. H. (June 2007). "How far droplets can move in indoor environments – revisiting the Wells evaporation–falling curve". Indoor Air. 17 (3). pp. 211–25. doi:10.1111/j.1600-0668.2007.00469.x. PMID 17542834.
- Setti, L.; Passarini, F.; De Gennaro, G. (2020-04-23). "Airborne Transmission Route of COVID-19: Why 2 Meters/6 Feet of Inter-Personal Distance Could Not Be Enough". Int. J. Environ. Res. Public Health. 17 (8): 2932. doi:10.3390/ijerph17082932. PMC 7215485. PMID 32340347.
- Thoelen, J. (2020-04-08). "Belgian-Dutch Study: Why in times of COVID-19 you should not walk/run/bike close behind each other". Medium. Retrieved 2020-04-01.
- Letzter, R. (2020-03-31). "Is 6 feet enough space for social distancing? Not everyone thinks that's enough distance". Live Science. Retrieved 2020-04-01.
- Reynolds, G. (2020-04-15). "For Runners, Is 15 Feet the New 6 Feet for Social Distancing? When we walk briskly or run, air moves differently around us, increasing the space required to maintain a proper social distance". New York Times. Retrieved 2020-04-01.
- Sheikh, K.; Gorman, J.; Chang, K. (2020-04-14). "Stay 6 Feet Apart, We're Told. But How Far Can Air Carry Coronavirus? Most of the big droplets travel a mere six feet. The role of tiny aerosols is the 'trillion-dollar question.'". New York Times. Retrieved 2020-04-01.
- Huang, S. (2020-03-26). "Why we should all wear masks – There is new scientific rationale". Medium. Retrieved 2020-04-01.
- "The 2019–2020 Novel Coronavirus (Severe Acute Respiratory Syndrome Coronavirus 2) Pandemic: A Joint American College of Academic International Medicine‑World Academic Council of Emergency Medicine Multidisciplinary COVID‑19 Working Group Consensus Paper". ResearchGate. Retrieved 2020-05-16.
- Wiles, Siouxsie (2020-03-09). "The three phases of Covid-19—and how we can make it manageable". The Spinoff. Morningside, Auckland, New Zealand. Archived from the original on 2020-03-27. Retrieved 2020-03-09.
- Wiles, Siouxsie (2020-03-14). "After 'Flatten the Curve', we must now 'Stop the Spread'. Here's what that means". The Spinoff. Morningside, Auckland, New Zealand. Archived from the original on 2020-03-26. Retrieved 2020-03-13.
- Anderson, Roy Malcom; Heesterbeek, Hans J. A. P.; Klinkenberg, Don; Hollingsworth, T. Déirdre (2020-03-09). "How will country-based mitigation measures influence the course of the COVID-19 epidemic?". The Lancet. 395 (10228): 931–934. doi:10.1016/S0140-6736(20)30567-5. ISSN 0140-6736. PMC 7158572. PMID 32164834. Archived from the original on 2020-03-27. Retrieved 2020-03-28.
A key issue for epidemiologists is helping policy makers decide the main objectives of mitigation—e.g., minimising morbidity and associated mortality, avoiding an epidemic peak that overwhelms health-care services, keeping the effects on the economy within manageable levels, and flattening the epidemic curve to wait for vaccine development and manufacture on scale and antiviral drug therapies.
- Islam, Nazrul; Sharp, Stephen J; Chowell, Gerardo; Shabnam, Sharmin; Kawachi, Ichiro; Lacey, Ben; Massaro, Joseph M; D’Agostino, Ralph B; White, Martin (2020-07-15). "Physical distancing interventions and incidence of coronavirus disease 2019: natural experiment in 149 countries". BMJ. 370: m2743. doi:10.1136/bmj.m2743. ISSN 1756-1833. PMC 7360923.
- Maharaj, Savi; Kleczkowski, Adam (2012). "Controlling epidemic spread by social distancing: Do it well or not at all". BMC Public Health. 12 (1): 679. doi:10.1186/1471-2458-12-679. PMC 3563464. PMID 22905965.
- "Guidance on Preparing Workplaces for an Influenza Pandemic". Occupational Safety and Health Act of 1970. United States Department of Labor. OSHA 3327-02N 2007. Archived from the original on 2020-03-25. Retrieved 2020-03-18. 
- "Social Distancing". safety-security.uchicago.edu. Department of Safety & Security, The University of Chicago. 2015. Archived from the original on 2020-03-24. Retrieved 2020-03-29.
- Shukman, David (2020-06-23). "Is it safe to relax the 2m rule?". BBC News. Retrieved 2020-07-01.
- Foley, Katherine Ellen. "Where does the six-foot guideline for social distancing come from?". Quartz. Retrieved 2020-08-04.
- Riley, R. L. (1983-01-22). "The contagiosity of tuberculosis". Schweizerische Medizinische Wochenschrift. 113 (3): 75–79. ISSN 0036-7672. PMID 6338584.
- Wells, W. F. (1934-11-01). "ON AIR-BORNE INFECTIONSTUDY II. DROPLETS AND DROPLET NUCLEI". American Journal of Epidemiology. 20 (3): 611–618. doi:10.1093/oxfordjournals.aje.a118097. ISSN 0002-9262.
- Olsen, Sonja J.; Chang, Hsiao-Ling; Cheung, Terence Yung-Yan; Tang, Antony Fai-Yu; Fisk, Tamara L.; Ooi, Steven Peng-Lim; Kuo, Hung-Wei; Jiang, Donald Dah-Shyong; Chen, Kow-Tong; Lando, Jim; Hsu, Kwo-Hsiung (2003-12-18). "Transmission of the Severe Acute Respiratory Syndrome on Aircraft". New England Journal of Medicine. 349 (25): 2416–2422. doi:10.1056/NEJMoa031349. ISSN 0028-4793. PMID 14681507.
- Barajas, Julia; Etehad, Melissa (2020-03-13). "Joined palms, hands-on hearts, Vulcan salutes: Saying hello in a no-handshake era". Los Angeles Times. Archived from the original on 2020-03-27. Retrieved 2020-03-18.
- "2009 Press Releases". Health Protection Agency. 2009-12-24. Archived from the original on 2010-03-03. Retrieved 2009-12-24.
- Zumla, Alimuddin; Yew, Wing-Wai; Hui, David S. C. (2010-08-31). Emerging Respiratory Infections in the 21st Century, An Issue of Infectious Disease Clinics. 24. Elsevier Health Sciences. p. 614. ISBN 978-1-4557-0038-7. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Cauchemez, Simon; Ferguson, Neil Morris; Wachtel, Claude; Tegnell, Anders; Saour, Guillaume; Duncan, Ben; Nicoll, Angus (August 2009). "Closure of schools during an influenza pandemic". The Lancet Infectious Diseases. 9 (8): 473–481. doi:10.1016/S1473-3099(09)70176-8. ISSN 1473-3099. PMC 7106429. PMID 19628172. Retrieved 2020-03-29.
- Rousculp, Matthew D.; Johnston, Stephen S.; Palmer, Liisa A.; Chu, Bong-Chul; Mahadevia, Parthiv J.; Nichol, Kristin L. (October 2010). "Attending Work While Sick: Implication of Flexible Sick Leave Policies". Journal of Occupational and Environmental Medicine. 52 (10): 1009–1013. doi:10.1097/jom.0b013e3181f43844. PMID 20881626.
- Kumar, Supriya; Crouse Quinn, Sandra; Kim, Kevin H.; Daniel, Laura H.; Freimuth, Vicki S. (January 2012). "The Impact of Workplace Policies and Other Social Factors on Self-Reported Influenza-Like Illness Incidence During the 2009 H1N1 Pandemic". American Journal of Public Health. 102 (1): 134–140. doi:10.2105/AJPH.2011.300307. PMC 3490553. PMID 22095353.
- "Social Distancing Support Guidelines For Pandemic Readiness" (PDF). Colorado Department of Public Health and Environment. March 2008. Archived from the original (PDF) on 2017-02-13. Retrieved 2017-02-13.
- Booy, Robert; Ward, James (2015). "Evidence compendium and advice on social distancing and other related measures for response to an influenza pandemic" (PDF). Paediatric Respiratory Reviews. National Centre for Immunisation Research and Surveillance. 16 (2): 119–126. doi:10.1016/j.prrv.2014.01.003. PMID 24630149. Archived from the original (PDF) on 2015-05-15. Retrieved 2015-05-15. (13 pages)
- Inglesby, Thomas V.; Nuzzo, Jennifer B.; O'Toole, Tara; Henderson, Donald Ainslie (2006). "Disease Mitigation Measures in the Control of Pandemic Influenza". Biosecurity and Bioterrorism: Biodefense Strategy, Practice, and Science. 4 (4): 366–375. CiteSeerX 10.1.1.556.2672. doi:10.1089/bsp.2006.4.366. PMID 17238820.
- Davis, Kenneth C. (2018-09-21). "Philadelphia Threw a WWI Parade That Gave Thousands of Onlookers the Flu". Smithsonian Magazine. Archived from the original on 2020-03-27. Retrieved 2020-03-27.
- "The Flu in Boston". American Experience. WGBH Educational Foundation. Archived from the original on 2020-03-20. Retrieved 2020-03-28.
- Ishola, David A.; Phin, Nick (December 2011). "Could Influenza Transmission Be Reduced by Restricting Mass Gatherings? Towards an Evidence-Based Policy Framework". Journal of Epidemiology and Global Health. 1 (1): 33–60. doi:10.1016/j.jegh.2011.06.004. PMC 7104184. PMID 23856374.
- Ferguson, Neil Morris; Cummings, Derek A. T.; Fraser, Christophe; Cajka, James C.; Cooley, Philip C.; Burke, Donald S. (2006). "Strategies for mitigating an influenza pandemic". Nature. 442 (7101): 448–452. Bibcode:2006Natur.442..448F. doi:10.1038/nature04795. PMC 7095311. PMID 16642006.
- Bell, David M. (2004). "Public health interventions and SARS spread, 2003". Emerging Infectious Diseases. 10 (11): 1900–1906. doi:10.3201/eid1011.040729. PMC 3329045. PMID 15550198. Archived from the original on 2009-11-05.
- Cetron, Martin (2004). "Isolation and Quarantine: Containment Strategies for SARS, 2003". Learning from SARS: Preparing for the Next Disease Outbreak. National Academy of Sciences. ISBN 0-30959433-2.
- Kohn, George Childs, ed. (2008) [2001, 1998]. Encyclopedia of Plague and Pestilence: From Ancient Times to the Present. Facts On File—Library Of World History (3 ed.). New York: Infobase Publishing. p. 30. ISBN 978-1-43812923-5. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Byrne, Joseph P., ed. (2008). Encyclopedia of Pestilence, Pandemics, and Plague (PDF). 1&2. Westport, Connecticut / London: Greenwood Publishing Group, Inc. / Greenwood Press. LCCN 2008019487. 978–0–313–34102–1 (vol 1), 978–0–313–34103–8 (vol 2). Archived (PDF) from the original on 2020-02-15. Retrieved 2020-03-29.
- Arntsen, Emily (2020-03-06). "Closing borders can delay, but can't stop the spread of COVID-19, new report says". News@Northeastern. Northeastern University. Archived from the original on 2020-03-23. Retrieved 2020-03-28.
- Chinazzi, Matteo; Davis, Jessica T.; Ajelli, Marco; Gioannini, Corrado; Litvinova, Maria; Merler, Stefano; Pastore y Piontti, Ana; Mu, Kunpeng; Rossi, Luca; Sun, Kaiyuan; Viboud, Cécile; Xiong, Xinyue; Yu, Hongjie; Halloran, M. Elizabeth; Longini, Jr., Ira M.; Vespignani, Alessandro (2020-03-06). "The effect of travel restrictions on the spread of the 2019 novel coronavirus (COVID-19) outbreak". Science. 368 (6489): 395–400. doi:10.1126/science.aba9757. PMC 7164386. PMID 32144116.
- Glass, Robert J.; Glass, Laura M.; Beyeler, Walter E.; Min, H. Jason (November 2006). "Targeted Social Distancing Designs for Pandemic Influenza". Emerging Infectious Diseases. Centers for Disease Control and Prevention. 12 (11): 1671–1681. doi:10.3201/eid1211.060255. PMC 3372334. PMID 17283616. Archived from the original on 2020-03-23. Retrieved 2020-03-29.
- "Social Distancing Guidelines (for workplace communicable disease outbreaks)". Society for Human Resource Management. 2017. Archived from the original on 2017-04-23. Retrieved 2017-04-23.
- "What's the difference between shielding, self-isolation and social distancing?". www.bhf.org.uk. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Tan, Chorh-Chuan (May 2006). "SARS in Singapore—Key Lessons from an Epidemic" (PDF). Annals Academy of Medicine. 35 (5): 345–349. PMID 16830002. Archived from the original (PDF) on 2017-04-24. Retrieved 2017-04-23.
- Teh, Benjamin; Olsen, Karen; Black, Jim; Cheng, Allen C.; Aboltins, Craig; Bull, Kirstin; Johnson, Paul D. R.; Grayson, M. Lindsay; Torresi, Joseph (2012) [2011-11-22, 2011-09-26, 29 June 2011]. "Impact of swine influenza and quarantine measures on patients and households during the H1N1/09 pandemic". Scandinavian Journal of Infectious Diseases. 44 (4): 289–296. doi:10.3109/00365548.2011.631572. PMID 22106922.
- "Staying at home and away from others (social distancing)". GOV.UK.
- Garrett, Laurie (2014-08-14). "Heartless but Effective: I've Seen 'Cordon Sanitaire' Work Against Ebola". The New Republic. Archived from the original on 2017-09-10. Retrieved 2017-06-05.
- "Outbreak of Ebola Viral Hemorrhagic Fever—Zaire, 1995". Morbidity and Mortality Weekly Report. 44 (19). 1995-05-19. pp. 381–382. Archived from the original on 2019-08-25. Retrieved 2017-06-05.
- Kaplan Hoffmann, Rachel; Hoffmann, Keith (2015-02-19). "Ethical Considerations in the Use of Cordons Sanitaires". Clinical Correlations. NYU Langone, New York: New York University. eISSN 1944-0030. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Garrett, Laurie (2011). Betrayal of Trust: The Collapse of Global Public Health. Hachette Books. ISBN 978-1-40130386-0.
- "Gunnison: Case Study". Center for the History of Medicine. University of Michigan Medical School. Archived from the original on 2018-06-15. Retrieved 2017-06-06.
- Markel, Howard; Stern, Alexandra Minna; Navarro, J. Alexander; Michalsen, Joseph R.; Monto, Arnold S.; DiGiovanni, Jr., Cleto (December 2006). "Nonpharmaceutical Influenza Mitigation Strategies, US Communities, 1918–1920 Pandemic" (PDF). Emerging Infectious Diseases. 12 (12): 1961–1964. doi:10.3201/eid1212.060506. PMC 3291356. PMID 17326953. Archived (PDF) from the original on 2017-02-16. Retrieved 2017-06-06.
- Taylor, Kate (2020-03-20) [2020-03-17]. "No Bus Service. Crowded Trains. Transit Systems Struggle With the Virus.—U.S. cities with public transit systems are being forced to adapt to the risks posed by the coronavirus, implementing new sanitation protocols while contending with fewer riders and workers". The New York Times. ISSN 0362-4331. Archived from the original on 2020-03-25. Retrieved 2020-03-25.
- "Flu Pandemic Mitigation—Social Distancing". globalsecurity.org. Archived from the original on 2020-03-22. Retrieved 2020-03-23.
- Souvay, Charles Léon (1913). "Leprosy". Catholic Encyclopedia. 9. Archived from the original on 2020-03-28. Retrieved 2020-03-28.
- Popular science monthly. New York: D. Appleton. 1916. p. 400.
- Pabst Battin, Margaret; Francis, Leslie P.; Jacobson, Jay A.; Smith, Charles B. (2009). The Patient as Victim and Vector: Ethics and Infectious Disease. Oxford University Press. p. 351. ISBN 978-0-19-533583-5. Archived from the original on 2020-03-28. Retrieved 2020-03-28.
- Melnick, Joseph L. (1996-07-01). "Current Status of Poliovirus Infections" (PDF). Clinical Microbiology Reviews. American Society for Microbiology. 9 (3): 293–300. doi:10.1128/CMR.9.3.293. PMC 172894. PMID 8809461. Archived (PDF) from the original on 2019-04-30. Retrieved 2020-03-28.
- Hatchett, Richard J.; Mecher, Carter E.; Lipsitch, Marc (2007-05-01) [2007-04-06, 2007-02-14, 9 December 2006]. Singer, Burton H. (ed.). "Public health interventions and epidemic intensity during the 1918 influenza pandemic". Proceedings of the National Academy of Sciences of the United States of America. 104 (18): 7582–7587. Bibcode:2007PNAS..104.7582H. doi:10.1073/pnas.0610941104. PMC 1849867. PMID 17416679.
- Starr, Isaac (1976-10-01). "Influenza in 1918: Recollections of the Epidemic in Philadelphia". Annals of Internal Medicine. 85 (4): 516–518. doi:10.7326/0003-4819-85-4-516. PMID 788585.
- McKinsey, David S.; McKinsey, Joel P.; Enriquez, Maithe (Jul–Aug 2018). "The 1918 Influenza in Missouri: Centennial Remembrance of the Crisis". Missouri Medicine. 115 (4): 319–324. ISSN 0026-6620. OCLC 7850378090. PMC 6140242. PMID 30228752.
- Smith, Richard (2007-06-30). "Social measures may control pandemic flu better than drugs and vaccines". British Medical Journal. 334 (7608): 1341. doi:10.1136/bmj.39255.606713.DB. ISSN 0959-8138. PMC 1906625. PMID 17599996.
- Kalnins, Irene (September 2006). "The Spanish influenza of 1918 in St. Louis, Missouri". Public Health Nursing. Boston, Massachusetts. 23 (5): 479–483. doi:10.1111/j.1525-1446.2006.00586.x. ISSN 0737-1209. PMID 16961567.
- Bootsma, Martin C. J.; Ferguson, Neil Morris (2007-05-01) [2007-03-13, 13 December 2006]. Singer, Burton H. (ed.). "The effect of public health measures on the 1918 influenza pandemic in U.S. cities". Proceedings of the National Academy of Sciences of the United States of America. 104 (18): 7588–7593. Bibcode:2007PNAS..104.7588B. doi:10.1073/pnas.0611071104. PMC 1849868. PMID 17416677.  (6 pages)
- Chin, Tom D. Y.; Foley, John F.; Doto, Irene L.; Gravelle, Clifton R.; Weston, Jean (February 1960). "Morbidity and mortality characteristics of Asian strain influenza". Public Health Reports. Sage Publications, Inc. 75 (2): 149–158. doi:10.2307/4590751. JSTOR 4590751. PMC 1929395. PMID 19316351. (19 pages)
- Wheeler, Colleen C.; Erhart, Laura M.; Jehn, Megan L. (November–December 2010). "Effect of School Closure on the Incidence of Influenza Among School-Age Children in Arizona". Public Health Reports. 125 (6): 851–859. doi:10.1177/003335491012500612. PMC 2966666. PMID 21121230.
- "Flu Pandemic Study Supports Social Distancing". NIH Research Matters. National Institutes of Health. 2011-06-06. Archived from the original on 2017-04-23. Retrieved 2017-04-22.
- Wardrop, Murray (2009-07-21). "Swine flu: schools should close to halt spread of virus, ministers told". The Telegraph. ISSN 0307-1235. Archived from the original on 2020-02-16. Retrieved 2020-03-17.
- Walsh, Eric, ed. (2009-07-20). "Closing schools won't stop pandemics: study". Reuters. Archived from the original on 2020-04-04. Retrieved 2020-03-17.
- Bell, David M. (November 2004). "Public Health Interventions and SARS Spread, 2003". Emerging Infectious Diseases. 10 (11): 1900–1906. doi:10.3201/eid1011.040729. ISSN 1080-6040. PMC 3329045. PMID 15550198.
- Bondy, Susan J.; Russell, Margaret L.; Laflèche, Julie M. L.; Rea, Elizabeth (2009-12-24). "Quantifying the impact of community quarantine on SARS transmission in Ontario: estimation of secondary case count difference and number needed to quarantine". BMC Public Health. 9 (1): 488. doi:10.1186/1471-2458-9-488. PMC 2808319. PMID 20034405.
- Stevens, Harry (2020-03-14). "These simulations show how to flatten the coronavirus growth curve". Washington Post. Archived from the original on 2020-03-30. Retrieved 2020-03-29.
- "COVID-19 Educational Disruption and Response". UNESCO. 2020-03-04. Archived from the original on 2020-03-29. Retrieved 2020-03-23.
- "Most UK cinemas shut after virus advice". BBC News. 2020-03-17. Archived from the original on 2020-03-23. Retrieved 2020-03-21.
- 'We're going to have more deaths': Influenza kills more people than the coronavirus so everyone is overreacting, right? Wrong—and here's why Archived 8 April 2020 at the Wayback Machine, MarketWatch, Quentin Fottrell, 9 March 2020.
- "Parents, police struggle to social distance the young in coronavirus outbreak". 2020-03-20. Archived from the original on 2020-03-23. Retrieved 2020-03-23.
- Young, Elise; Baker, David R. (2020-03-20). "Uh-Oh Moment Finally Hits States Slow to Adopt Social Distancing". Bloomberg News. Bloomberg L.P. Archived from the original on 2020-03-23. Retrieved 2020-03-29.
- Frieden, Tom. "Lessons from Ebola: The secret of successful epidemic response". CNN. Archived from the original on 2020-03-23. Retrieved 2020-03-23.
- "Coronavirus deprives nearly 300 million students of their schooling: UNESCO". The Telegram. Archived from the original on 2020-03-28. Retrieved 2020-03-23 – via Reuters.
- Lipsitch, Marc; Swerdlow, David L.; Finelli, Lyn (2020-03-26) [2020-02-19]. "Defining the Epidemiology of Covid-19—Studies Needed". New England Journal of Medicine. 382 (13): 1194–1196. doi:10.1056/NEJMp2002125. ISSN 0028-4793. PMID 32074416.
- Zimmermann, Petra; Curtis, Nigel (2020-03-18). "Coronavirus Infections in Children Including COVID-19: An Overview of the Epidemiology, Clinical Features, Diagnosis, Treatment and Prevention Options in Children". The Pediatric Infectious Disease Journal. Online First (5): 355–368. doi:10.1097/INF.0000000000002660. ISSN 0891-3668. PMC 7158880. PMID 32310621.
- "Adverse consequences of school closures". UNESCO. 2020-03-10. Archived from the original on 2020-03-25. Retrieved 2020-03-23.
- Ehrlich, Brenna (2020-03-15). "Taylor Swift Urges Fans to Stay Home Amid COVID-19 Outbreak: "I love you so much and I need to express my concern that things aren't being taken seriously enough right now," superstar writes". Rolling Stone. Archived from the original on 2020-03-19. Retrieved 2020-03-28.
- Reifschneider, Florian (2020). "A Movement to Stop the COVID-19 Pandemic". #StayTheFuckHome. Archived from the original on 2020-03-29. Retrieved 2020-03-29.
- Hudson, Alex (2020-03-17). "Busy Philipps Joins Cameo to Record "Stay the Fuck Home" Messages for Coronavirus". exclaim.ca. Archived from the original on 2020-03-27. Retrieved 2020-03-29.
- "AMA, AHA, ANA: #StayHome to confront COVID-19". Chicago, USA: American Medical Association. Archived from the original on 2020-03-28. Retrieved 2020-03-30.
- Berg, Madeline. "No, Netflix Is Not Spoiling Its Own Shows To Fight Coronavirus". Forbes. Archived from the original on 2020-03-27. Retrieved 2020-03-30.
- Sayej, Nadja (2020-03-25). "'It feels like wartime': how street artists are responding to coronavirus—The pandemic may have closed museums and galleries down but artists have found other ways to comment on the crisis". The Guardian. Street art. Archived from the original on 2020-03-29. Retrieved 2020-03-30.
- Solis, Jorge (2020-03-16). "The #StayTheF***kHome movement just wants you to, well, you know". Newsweek. Culture. Archived from the original on 2020-03-27. Retrieved 2020-03-30.
- Ao, Bethany (2020-03-19). "Social distancing can strain mental health. Here's how you can protect yourself". The Philadelphia Inquirer. Archived from the original on 2020-03-26. Retrieved 2020-03-24.
- "Stress and Coping". Coronavirus Disease 2019 (COVID-19). Centers for Disease Control and Prevention. 2020-03-23 [2020-02-11]. Archived from the original on 2020-03-29. Retrieved 2020-03-24.
- Willis, Olivia (2020-03-22). "Coronavirus: Social distancing and isolation can take a toll on your mental health, here's how some people are coping—Managing mental health in the time of coronavirus". ABC News. Archived from the original on 2020-03-28. Retrieved 2020-03-24.
- Treadwell-Deering, Diane E. (July 2020). "Coronavirus (COVID-19): Helping Kids With Autism Cope". KidsHealth.org. Retrieved 2020-07-26.
- Farmer, Sam (2020-05-08). "Coronavirus and social distancing through an autistic lens". The Hill. Retrieved 2020-07-26.
- Thom, Robyn; McDougle, Chris (2020-04-24). "Strategies to support teens and young adults with autism spectrum disorder during COVID-19". Harvard University. Retrieved 2020-07-26.
- Becker, Niels (2015). Modeling to Inform Infectious Disease Control. CRC Press. p. 104. ISBN 978-1-49873107-2.
- "Ending coronavirus lockdowns will be a dangerous process of trial and error". Science. 2020-04-14. Retrieved 2020-04-20.
- Lu, Marcus (2020-03-28). "The Math Behind Social Distancing". Visual Capitalist. Retrieved 2020-04-16.
- CDC Social Distancing
- American Red Cross: How to Social Distance
- Johns Hopkins: Social and Physical Distancing
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