Study Shows Pfizer Vaccine Efficacy Declines in Six Months

Pfizer-BioNTech’s study showed that the efficacy of its COVID-19 vaccine reduced by 13 percent over six months after the second dose, which means booster shots might be necessary in the future.

The vaccine’s efficacy diminished from 96% to 84% in six months which indicates a need for Pfizer to administer a supplemental dose to strengthen the protection.

More than 46,000 in the United States, Turkey, Brazil, Argentina, South Africa and Germany were observed for the study but were not peer-reviewed. 2,306 of the participants were between ages 12 and 15, while the rest were 16 or older, 51 being the median age. 

“Ongoing follow-up is needed to understand persistence of the vaccine effect over time, the need for booster dosing, and timing of such a dose,” the study’s authors wrote.

The World Health Organization (WHO) called to suspend administering booster shots at least until the end of September so that poorer countries will have a chance to immunize their populations with the first dose, which is part of WHO Director-General Tedros Adhanom Ghebreyesus’ plan to vaccinate 40% of the world by December.


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