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How 4 U.S. Cities Helped Slow Coronavirus Spread
The number of people leaving their homes fell gradually but persistently as officials closed schools, restaurants and bars in New York City, New Orleans, San Francisco and Seattle, according to a study published by the U.S. Centers for Disease Control and Prevention.
"The CDC report shows that when successive mitigation steps were put into place, individuals tended to heed them," said Dr. Amesh Adalja, a senior scholar at the Johns Hopkins Center for Health Security, in Baltimore.
The percentage of people leaving home in each of the four cities started around 80%, but that declined as officials layered on orders designed to promote social distancing.
Mobility decreased each time a new social distancing order was issued, starting with bans on mass gatherings, then restaurant and school closings, and finally stay-at-home orders. By April 1, the percentage leaving home was 42% in New York City, 47% in San Francisco, 52% in Seattle, and 61% in New Orleans.
Even better, as more social distancing measures were added, "there was a contemporaneous decrease in the percent change of the three-day average of new cases, suggesting that a positive effect may have occurred," Adalja said.
Led by Kathleen Ethier, head of the CDC's community mitigation task force for the COVID-19 response, the researchers tracked community mobility in each of the four cities using cellphone data that shows when a device has not moved more than 500 feet from its common nighttime location.
The researchers then created a timeline showing how the social distancing measures rolled out in the cities, and how those measures affected both the number of people leaving home as well as the daily and cumulative counts of COVID-19 patients.
Initial emergency declarations in the states where the cities are located did not do much to encourage people to stay home, the study showed.
SOURCE:
By Dennis Thompson HealthDay Reporter, "www.webmd.com", https://www.webmd.com/lung/news/20200414/how-4-us-cities-helped-slow-coronavirus-spread#1
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