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Breakthrough COVID-19 infections among the vaccinated may not be a severe threat
As the COVID-19 vaccination drive continues to expand throughout the world, SARS-CoV-2 variant mutations and breakthrough infections have posed a new public...
COVID-19 herd immunity: Current status
Herd immunity is a key concept for epidemic control, which states that only a proportion of a population needs to be immune to an infectious agent for it to...