Joinzoe: “We found that initial protection against infection a month after the second dose of the Pfizer vaccine was 88%, while after five to six months this fell to 74%. For the AstraZeneca vaccine, there was around 77% protection a month after the second dose, falling to 67% after four to five months.
This analysis included:
411,642 test results from users who were doubly vaccinated with the Pfizer mRNA vaccine at the time of the infection
709,486 test results from users who were doubly vaccinated with the AstraZeneca vaccine
76,051 test results from users who were not yet vaccinated at the time of the infection
We found that initial protection against infection a month after the second dose of the Pfizer vaccine was 88%, while after five to six months this fell to 74%.”
Professor Tim Spector, lead scientist at the ZOE COVID Study, says:
“A reasonable worst-case scenario could see protection below 50 percent for the elderly and healthcare workers by winter. With high levels of infection in the UK, driven by loosened social restrictions and a highly transmissible variant, this scenario could mean increased hospitalisations and deaths.
