For all four vaccines, they were able to find that having been previously infected with SARS-CoV-2 and then vaccinated conferred “additional protection once morest symptomatic infections and severe cases in individuals already previously infected”, note the authors.
Note: Conducted between February 2020 and November 2021, the study does not take into account the Omicron variant, which is more contagious and less sensitive to vaccines.
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