Johns Hopkins Bloomberg School of Public Health

COVID-19 Study Links Strict Social Distancing to Much Lower Chance of Infection

Researchers say that similar studies could be used to predict local trends in infectious outbreaks

Newswise — Using public transportation, visiting a place of worship, or otherwise traveling from the home is associated with a significantly higher likelihood of testing positive with the coronavirus SARS-CoV-2, while practicing strict social distancing is associated with a markedly lower likelihood, suggests a study from researchers at the Johns Hopkins Bloomberg School of Public Health.

For their analysis, the researchers surveyed a random sample of more than 1,000 people in the state of Maryland in late June, asking about their social distancing practices, use of public transportation, SARS-CoV-2 infection history, and other COVID-19-relevant behaviors. They found, for example, that those reporting frequent public transport use were more than four times as likely to report a history of testing positive for SARS-CoV-2 infection, while those who reported practicing strict outdoor social distancing were just a tenth as likely to report ever being SARS-CoV-2 positive.

The study is believed to be among the first large-scale evaluations of COVID-19-relevant behaviors that is based on individual-level survey data, as opposed to aggregated data from sources such as cellphone apps.

The results were published online on September 2 in Clinical Infectious Diseases.

“Our findings support the idea that if you’re going out, you should practice social distancing to the extent possible because it does seem strongly associated with a lower chance of getting infected,” says study senior author Sunil Solomon, MBBS, PhD, MPH, an associate professor in the Bloomberg School’s Department of Epidemiology and an associate professor of medicine at Johns Hopkins School Medicine. “Studies like this are also relatively easy to do, so we think they have the potential to be useful tools for identification of places or population subgroups with higher vulnerability.”

The novel coronavirus SARS-CoV-2 has infected nearly 27 million people around the world, of whom some 900,000 have died, according to the World Health Organization. In the absence of a vaccine, public health authorities have emphasized practices such as staying at home, and wearing masks and maintaining social distancing while in public. Yet there hasn’t been a good way to monitor whether—and among which groups—such practices are being followed.

Solomon and colleagues, including first author Steven Clipman, a PhD candidate in the Bloomberg School’s Department of International Health, quickly accessed willing survey participants via a company that maintains a large nationwide pool of potential participants as a commercial service for market research. The 1,030 people included in the study were all living in Maryland, which has logged more than 113,000 SARS-CoV-2 confirmed cases and nearly 3,700 confirmed deaths, according to the Maryland Department of Health.

The researchers asked the survey participants questions about recent travel outside the home, their use of masks, social distancing and related practices, and any confirmed infection with SARS-CoV-2 either recently or at all.

The results indicated that 55 (5.3 percent) of the 1,030 participants had tested positive for SARS-CoV-2 infection at any time, while 18 (1.7 percent) reported testing positive in the two weeks before they were surveyed.

The researchers found that when considering all the variables they could evaluate, spending more time in public places was strongly associated with having a history of SARS-CoV-2 infection. For example, an infection history was about 4.3 times more common among participants who stated that they had used public transportation more than three times in the prior two weeks, compared to participants who stated they had never used public transportation in the two-week period.

An infection history also was 16 times more common among those who reported having visited a place of worship three or more times in the prior two weeks, compared to those who reported visiting no place of worship during the period. The survey did not distinguish between visiting a place of worship for a religious service or other purposes, such as a meeting, summer camp or meal.

Conversely, those who reported practicing social distancing outdoors “always” were only 10 percent as likely to have a SARS-CoV-2 history, compared to those who reported “never” practicing social distancing.

An initial, relatively simple analysis linked many other variables to SARS-CoV-2 infection history, including being Black or Hispanic. But a more sophisticated, “multivariable” analysis suggested that many of these apparent links were largely due to differences in movement and social distancing.

“When we adjusted for other variables such as social distancing practices, a lot of those simple associations went away, which provides evidence that social distancing is an effective measure for reducing SARS-CoV-2 transmission,” Clipman says.

The data indicated a greater adoption of social distancing practices among some groups who are especially vulnerable to serious COVID-19 illness, suggesting that they were relatively aware of their vulnerability. For example, 81 percent of over-65 participants reported always practicing social distancing at outdoor activities, while only 58 percent of 18-24 year olds did so.

The results are consistent with the general public health message that mask-wearing, social distancing, and limiting travel whenever possible reduce SARS-CoV-2 transmission. The researchers suggest, though, that studies such as these, employing similarly rapid surveys of targeted groups, could also become useful tools for predicting where and among which groups infectious diseases will spread most quickly.

“We did this study in Maryland in June, and it showed among other things that younger people in the state were less likely to reduce their infection risk with social distancing—and a month later a large proportion of the SARS-CoV-2 infections detected in Maryland was among younger people,” says Solomon. “So, it points to the possibility of using these quick, inexpensive surveys to predict where outbreaks are going to happen based on behaviors, and then mobilizing public health resources accordingly.”

Solomon and his team are now conducting similar surveys in other states and are studying the surveys’ potential as predictive epidemiological tools.

“Rapid real-time tracking of non-pharmaceutical interventions and their association with SARS-CoV-2 positivity: The COVID-19 Pandemic Pulse Study” was written by Steven Clipman, Amy Wesolowski, Dustin Gibson, Smisha Agarwal, Anastasia Lambrou, Gregory Kirk, Alain Labrique, Shruti H. Mehta, and Sunil Solomon.

Support for the research and for some of the individual researchers came from the Johns Hopkins COVID-19 Research Response Program, the Burroughs Wellcome Fund, and the National Institutes of Health (DP2LM013102, DP2DA040244).

 




Filters close

Showing results

110 of 4204
Newswise: Pediatric ER Saw Steep Drop in Asthma Visits During Spring COVID-19 Lockdown
1-Dec-2020 8:00 AM EST
Pediatric ER Saw Steep Drop in Asthma Visits During Spring COVID-19 Lockdown
American Thoracic Society (ATS)

A new study published online in the Annals of the American Thoracic Society discusses a steep drop off from prior years in asthma-related emergency department (ED) visits at Boston Children’s Hospital during the spring 2020 COVID-19 surge and lockdown.

access_time Embargo lifts in 2 days
Embargo will expire: 9-Dec-2020 4:00 PM EST Released to reporters: 3-Dec-2020 4:50 PM EST

A reporter's PressPass is required to access this story until the embargo expires on 9-Dec-2020 4:00 PM EST The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

access_time Embargo lifts in 2 days
Embargo will expire: 9-Dec-2020 4:00 PM EST Released to reporters: 3-Dec-2020 3:50 PM EST

A reporter's PressPass is required to access this story until the embargo expires on 9-Dec-2020 4:00 PM EST The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

Newswise: 250384_web.jpg
Released: 3-Dec-2020 3:05 PM EST
Study finds COVID-19 hindering US academic productivity of faculty with young children
University of Tennessee Health Science Center

The academic productivity of higher education faculty In the United States in the science, technology, engineering, mathematics, and medicine (STEMM) fields with very young children suffered as a result of the stay-at-home orders during the early months of the coronavirus pandemic, according to a new study by researchers at the University of Tennessee Health Science Center, the University of Florida College of Medicine, and the University of Michigan School of Medicine.

Released: 3-Dec-2020 2:50 PM EST
Kidney disease leading risk factor for COVID-related hospitalization
Geisinger Health System

An analysis of Geisinger's electronic health records has revealed chronic kidney disease to be the leading risk factor for hospitalization from COVID-19.

Newswise: Identity Verification During the Age of COVID-19
Released: 3-Dec-2020 2:25 PM EST
Identity Verification During the Age of COVID-19
Homeland Security's Science And Technology Directorate

S&T's Biometric Technology Rally focused on the ability of acquisition systems and matching algorithms to recognize travelers without asking them to remove their masks, thereby reducing risk for frontline workers.

access_time Embargo lifts in 2 days
Embargo will expire: 10-Dec-2020 11:00 AM EST Released to reporters: 3-Dec-2020 2:20 PM EST

A reporter's PressPass is required to access this story until the embargo expires on 10-Dec-2020 11:00 AM EST The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

access_time Embargo lifts in 2 days
Embargo will expire: 7-Dec-2020 4:45 PM EST Released to reporters: 3-Dec-2020 2:10 PM EST

A reporter's PressPass is required to access this story until the embargo expires on 7-Dec-2020 4:45 PM EST The Newswise PressPass gives verified journalists access to embargoed stories. Please log in to complete a presspass application. If you have not yet registered, please Register. When you fill out the registration form, please identify yourself as a reporter in order to advance to the presspass application form.

Released: 3-Dec-2020 2:00 PM EST
Testosterone May Contribute to More Severe COVID-19 Disease
American Physiological Society (APS)

New research suggests that levels of the sex hormones estrogen and testosterone could contribute to infection risk and severity of COVID-19.


Showing results

110 of 4204

close
1.14132