Changes in SARS-CoV-2 Positivity Rate in Outpatients in Seattle and Washington State, March 1-April 16, 2020.

JAMA · 2020

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Abstract

This population epidemiology study characterizes trends in polymerase chain reaction (PCR) test positivity for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in Washington State and the Seattle area between March 1 and April 16, 2020, before and after statewide physical distancing guidelines and stay-at-home orders.