Intended for healthcare professionals


Covid-19: Protection from two doses of vaccine wanes within six months, data suggest

BMJ 2021; 374 doi: (Published 25 August 2021) Cite this as: BMJ 2021;374:n2113

Read our latest coverage of the coronavirus pandemic

  1. Gareth Iacobucci
  1. The BMJ

Protection provided by two doses of the Pfizer and the AstraZeneca covid-19 vaccines wanes within six months, an analysis of UK data suggests.

The latest analysis from the Zoe Covid Study, which investigates real world vaccine effectiveness, examined data from positive PCR test results between May and July 2021 among 1.2 million people who had received two doses of Pfizer or AstraZeneca vaccine.

The results, released in a press release, show that protection after two doses of the Pfizer vaccine decreased from 88% at one month to 74% at five to six months; protection for AstraZeneca decreased was from …

View Full Text

Log in

Log in through your institution


* For online subscription