Evolving Virulence? Decreasing COVID-19 Complications among Massachusetts Healthcare Workers: A Cohort Study

  1. Fan-Yun Lan
  2. Robert Filler
  3. Soni Mathew
  4. Eirini Iliaki
  5. Rebecca Osgood
  6. Lou Ann Bruno-Murtha
  7. Stefanos N. Kales
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Abstract

The hypothesis of attenuating SARS-CoV-2 virulence has been raised. We examined the temporal distribution of COVID-19 complications (ER visits, hospitalization, intubation/code, and/or death) among healthcare workers in one system that applied uniform screening criteria throughout the research period, and found the complication rate significantly decreased after April 15, 2020.

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