NEW YORK, Oct 5 ― The effectiveness of the Pfizer Inc/BioNTech SE vaccine in preventing infection by the coronavirus dropped to 47 per cent from 88 per cent six months after the second dose, according to data published yesterday that US health agencies considered when deciding on the need for booster shots.
The data suggests that the drop is due to waning efficacy, rather than more contagious variants, researchers said. A potential limitation of the study was a lack of data on adherence to masking guidelines and occupations in the study population, which could have affected frequency of testing and likelihood of exposure to the virus.
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