- Liittynyt
- 16.10.2016
- Viestejä
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Pfizer-Biontechin rokotteen teho 84% 6kk rokotteiden jälkeen?
www.theguardian.com
Pfizer jab just 84% effective after six months, data shows
The efficacy of the Covid-19 vaccine developed by Pfizer and BioNTech fell from 96% to 84% over six months, according to a preprint not yet peer-reviewed.
Stat News reports that an ongoing Pfizer study of more than 44,000 people, the vaccine’s efficacy in preventing any Covid-19 infection that causes even minor symptoms appeared to decline by an average of 6% every two months after administration.
Moderna’s jab was 90% effective against symptomatic Covid-19 and 95% effective against severe disease after six months, the company said in April, but Johnson & Johnson has not disclosed six-month efficacy data, Stat News reports.
The Pfizer study, which enrolled volunteers in Europe and the Americas, does not address whether the vaccine is less effective against the Delta variant.
The pharmaceutical company’s chief of research and development said he expected a third dose to be “somewhat more long lasting” than second dose.

Pfizer jab efficacy drops to 84% over six months – as it happened
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