Evolving Virulence? Decreasing COVID-19 Complications among Massachusetts Healthcare Workers: A Cohort Study
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OA: gold
CC-BY-ND-4.0
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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- europepmc
- last seen: 2026-05-19T01:45:01.086888+00:00
- unpaywall
- last seen: 2026-05-21T05:10:58.409756+00:00
License: CC-BY-ND-4.0