One thing we know for sure about SARS-CoV-2, the virus that causes COVID-19, is that it is changing constantly. Since the beginning of the pandemic, we've seen a number of prominent variants, including Alpha, Beta, Delta, and Omicron.
SARS-CoV-2, the virus that causes COVID-19.
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病毒名: SARS-CoV-2 疾病名: covid-19.
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03/13/2023 postreply
17:52:17