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Early COVID-19 and Severity of Subsequent Omicron Infection in Ontario Canada

Caroline Kassee1, Altynay Shigayeva1, Christopher Kandel2,3

  • 1Department of Microbiology, Sinai Health, Toronto, Canada.

Influenza and Other Respiratory Viruses
|January 13, 2026
PubMed

Keywords:
Omicronactivities of daily living (ADL)pre‐existing immunityprior infectionreinfectionseverity

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