The protection from Pfizer's COVID-19 vaccine may begin to wane against infection after 2 months, but it still prevents hospitalization and death for at least 6 months, according to two new studies published Wednesday in The New England Journal of Medicine.
The new findings support what Pfizer, the CDC, and top health officials have said in recent weeks: Initial protection against getting the coronavirus itself may drop over time, but people who get the vaccine avoid the worst effects of severe disease.
In the first study, researchers in Qatar estimated vaccine efficacy against COVID-19 infection and severe, critical, or fatal cases between Jan. 1 and Sept. 5. They based the report on infections among 900,000 vaccinated people in Qatar.
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