Alliance for Pandemic Preparedness

July 6, 2020

Retrospective Screening for SARS-CoV-2 RNA in California, USA, Late 2019

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  • Hogan et al. retrospectively tested 1,700 nasopharyngeal swab samples from persons with respiratory signs/symptoms seen at Stanford Health Care, Palo Alto, California, USA, during October 31, 2019–December 31, 2019. They found no evidence that SARS-CoV-2 infections occurred earlier than was previously recognized. 

Hogan et al. (July 3, 2020). Retrospective Screening for SARS-CoV-2 RNA in California, USA, Late 2019. Emerging Infectious Diseases. https://doi.org/10.3201/eid2610.202296