Study indicates factors that could have contributed to delayed detection of SARS-Cov-2 in the US, Europe

Study indicates factors that could have contributed to delayed detection of SARS-Cov-2 in the US, Europe

Study indicates factors that could have contributed to delayed detection of SARS-Cov-2 in the US, Europe

SARS-CoV-2 arrived in Washington State somewhere between late January and early February 2020, sparking rapid community transmission of the virus that went undetected for several weeks before this community spread became evident, prompting a change in testing criteria to emphasize individuals with no travel history.