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https://www.cnbc.com/2021/08/25/covid-pr...finds.html

Protection against the coronavirus is waning among those who have received both shots of the AstraZeneca and Pfizer vaccines, a new U.K. study has found.

An analysis from the U.K.’s ZOE Covid app study of over 400,000 people who had received both shots of the Pfizer-BioNTech vaccine, showed that it was 88% effective in protecting against the coronavirus a month after receiving both shots. However, its effectiveness fell to 74% five or six months after receiving both doses of the Pfizer vaccine.

In the same study, an analysis of over 700,000 people who had received both doses of the Oxford-AstraZeneca vaccine showed its effectiveness fell from 77% after a month to 67% at the four to five month mark.