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並前往https://www.mayoclinic.org/diseases-conditions/coronavirus/expert-answers/covid-variant/faq-20505779

COVID-19 variants: What's the concern? - Mayo Clinic

Currently, one variant of the virus (SARS-CoV-2) that causes coronavirus disease 2019 (COVID-19) is creating concern in the U.S.. Delta (B.1.617.2).

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