Science 29 Jul 2021 Efficacy of Pfizer/B ...

Efficacy of Pfizer/BioNTech Covid vaccine drops to 84 per cent after 6 months

ANI
Published Jul 29, 2021, 9:34 am IST
Updated Jul 29, 2021, 9:34 am IST
Ongoing follow-up is needed to understand the persistence of the vaccine effect over time
A nurse prepares a dose of the Pfizer-BioNTech vaccine against COVID-19 at the Cecilia Rivadeneira Foundation in Quito. (Photo: AFP/File)
 A nurse prepares a dose of the Pfizer-BioNTech vaccine against COVID-19 at the Cecilia Rivadeneira Foundation in Quito. (Photo: AFP/File)

Washington: The efficacy of the Pfizer/BioNTech coronavirus vaccine fell from 96% to 84% after six months, a new preprint report by medRxiv showed on Wednesday.

"Efficacy peaked at 96.2 percent during the interval from 7 days to <2 months post-dose 2, and declined gradually to 83.7 percent from 4 months post-dose 2 to the data cut-off, an average decline of ~6 percent every 2 months," the report said.

 

Ongoing follow-up is needed to understand the persistence of the vaccine effect over time, it added.

According to data that has not been reviewed, the vaccine was initially 91% effective at preventing COVID-19 over the course of six months.

The US health-oriented news outlet Stat suggested that if the vaccine efficacy keeps declining at the rate described in the study, it will end up being less than 50% within 18 months from the date of vaccination and so a third dose would be required.

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