LATEST: Pfizer COVID-19 vaccine 90% effective at preventing hospitalization, even with delta variant, new study finds.
has found. This is true even in the face of the delta variant as well as if the person has not received a booster shot.wanes rapidly as time passes, the study found. After five months, it is just 47% effective at preventing infection.
"The effectiveness of the vaccine against the delta and non-delta variants remained high during the study, suggesting that the vaccines worked well even when a variant was present," Dr. Simone Wildes, an infectious disease specialist and ABC News contributor, said.In this file photo a sign for Pfizer pharmaceutical company is seen on a building in Cambridge, Massachusetts.
Vaccines might be less effective for older adults and people with underlying medication conditions, the study found. MORE: The EU's drug regulator says it supports giving booster shots of Pfizer's COVID-19 vaccine to people 18 and older
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