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The Pfizer jab’s effectiveness against a Covid infection completely disappears after six months.
Its protection wanes dramatically; it is still 47 percent effective between months four and six, but this had been as far as scientists had tracked it.
Researchers from Umea University in Sweden analysed the rates of severe Covid infections, which needed hospital care or resulted in death, in 1.68 million vaccinated and unvaccinated people between January and October this year.
Overall, the Pfizer jab’s effectiveness was around 92 percent for the first 30 days after inoculation, but “no effectiveness could be detected” 211 days, or seven months, after getting the jab, the researchers said.
Its effectiveness waned the quickest in the most vulnerable—those who needed its protection the most—including the elderly, frail and those with one of the comorbidities associated with severe Covid infection, including obesity, diabetes and heart problems.
(Source: Lancet, 2021; preprint: https://papers.ssm.com/sol3/papers.cfm?/abstract_id=3949410)
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3949410
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