Update: This article was updated March 1.
The United States has entered a different stage in the pandemic. Four years after the virus emerged, the covid-19 landscape has changed dramatically. The virus is no longer the emergency it once was, when the population had no protection against the novel pathogen SARS-CoV-2. By the end of 2023, 98 percent of people in the United States had disease-fighting antibodies from vaccination, prior infection or both, which confers the strongest immunity.
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