BA.2, where are you? Dominant strain hasn't shown signs of starting a surge

BA.2, where are you? Dominant strain hasn't shown signs of starting a surge

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Key Facts

  • The Omicron subvariant caused as many as 3 in 4 cases of Covid-19 in the United States last week, according to the latest genomic surveillance from the US Centers for Disease Control and Prevention, but so far, there are no signs of a looming surge in the US.
  • Andy Pekosz, who studies viruses at Johns Hopkins University, says the new wave of cases in Europe may have more to do with timing than any features of BA.2.
  • If BA.2 does go quietly, it may be because the US did such a poor job of stopping transmission of Omicron and the variants that came before it, that we have failed upward, bungling our way to a high level of immune protection.
  • Matus says Omicron and Delta swept through the population in a matter of weeks, while BA.2 has been creeping up for a few months.

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