People might mistakenly think the Covid-19 vaccines will completely block infection, but the shots are mainly designed to prevent severe illness, says Louis Mansky, a virus researcher at the University of Minnesota.
Two doses of the Pfizer-BioNTech or Moderna vaccines or one dose of the Johnson & Johnson vaccine still offer strong protection against serious illness from omicron. While those initial doses aren’t very good at blocking Omicron infection, boosters—particularly with the Pfizer and Moderna vaccines—rev up levels of the antibodies to help fend off infection.
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