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CLAIM: The Pfizer vaccine is only 42% effective against COVID-19.
THE FACTS: As the Pfizer vaccine gained official FDA approval Monday, some social media users pointed to a recent finding that the shot was only 42% effective at preventing COVID-19 infection in July. The posts used that figure to suggest the vaccine is ineffective and to question why it earned the regulatory agency’s highest stamp of approval. The 42% figure comes from an Aug. 8 study that has not yet been peer reviewed or published in a scientific journal. It was conducted by the health care technology company nference and the Mayo Clinic in Minnesota. The study tracked vaccinated and unvaccinated people from January to July to compare the Pfizer and Moderna vaccines’ effectiveness at preventing any type of infection — asymptomatic and symptomatic.
However, he said the research does point to the need to develop booster shots to bolster waning immunity over time, an issue experts predicted early on.
Effectiveness is expected to wane over time
Pfizer reported in late July that six months into its original study, the vaccine remained 97% protective against severe COVID-19. Protection against milder infection decreased slightly, from a peak of 96% two months after the second dose to 84% by six months.
Recent data released by the Health Ministry shows that those who were first to receive their two doses of the Pfizer COVID vaccine are more likely now to be infected, as the vaccine appears to lose protection potency over time.
Data released by the Health Ministry last week suggested that people vaccinated in January have just 16% protection against infection now, while in those vaccinated in April, the effectiveness was at 75%.
Over a 4-week period (20 June to 17 July 2021), Pfizer's general effectiveness decreased as the time before exposure increased: efficacy was 79% for those who received their second dose in April, 69% for March, 44% for February, and 16% for people who were fully-vaccinated back in January.
originally posted by: fiora
a reply to: infolurker
I think, this could be considered good news in some sense. If you remember, in the earlier days of vaccination, some scientists were concerned about the vaccine effects on female fertility. Given that the efficacy wanes with time, would imply theoretically that potential vaccine side effects on fertility are only temporary. Profit.