https://www.sciencedaily.com/releases/2020/07/200702100547.htm

The decline in the number of daily trips people made as tracked by mobile phone data helped slow the spread of the virus, according to findings published today in The Lancet Infectious Diseases journal from the Johns Hopkins team that created the world-famous online coronavirus tracking map.

"Our results strongly support the conclusion that social distancing played a crucial role in the reduction of case growth rates in multiple U.S. counties during March and April, and is therefore an effective mitigation policy for COVID-19 in the United States," said Lauren Gardner, co-director of the Center for Systems Science and Engineering at Johns Hopkins, who led the research team.