COVID-19 variants: What's the concern? - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-variant/faq-20505779
WebNov 4, 2023 · Answer From Daniel C. DeSimone, M.D. Concern over variants, sometimes called strains, of the virus that causes COVID-19 is based on how the virus might change. A virus could get better at infecting people, spread faster or cause people to get sicker. As a virus infects a group of people, the virus copies itself.
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