Early Detection of Covid-19 through a Citywide Pandemic Surveillance Platform

persons enrolled online and were sent kits, by rapid-delivery services, for home collection of a midnasal swab; samples were returned by mail. After identification of the first case of Covid-19 in Washington State, the samples that were collected were also tested for SARS-CoV-2.

Of these, 2353 (66.8%) completed all the study procedures, including testing; SARS-CoV-2 was detected in 25 (1.1%), of whom 2 were children

https://www.nejm.org/doi/full/10.1056/NEJMc2008646?query=featured_coronavirus