Pfizer’s CEO says Covid vaccine effectiveness drops to 84% after six months
2021-07-29 10:00:07 source：CNBC
July 28, 2021
The effectiveness of Pfizer’s Covid-19 vaccine steadily declines over time, dropping to about 84% for vaccinated people about four to six months after getting their second dose, according to CEO Albert Bourla.
The comments, made on Wednesday on CNBC’s “The Exchange,” are based on the findings of a new company-funded study that has yet to be peer reviewed. It comes as the drugmaker clashes with U.S. health officials over the need for a third Covid vaccine dose to boost immunity protection.
The study found the vaccine’s effectiveness was strongest, at 96.2%, between one week and two months after receiving the second dose. It declined an average of 6% every two months, according to the study, which signed up more than 44,000 people across the U.S. and other countries. The efficacy after “four to six months was approximately 84%,” Bourla said.
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