Protection from two doses of the Pfizer and AstraZeneca vaccines wanes within less than six months, according to a study suggesting that booster shots may be needed to ensure prolonged coverage.
The latest finding comes as several countries are rolling out additional jabs for the fully vaccinated, a move slammed by the World Health Organization as millions in the world have yet to receive a single dose.
The Pfizer jab was 88 per cent effective a month after the second dose, but protection fell to 74 per cent after five to six months, according to the latest analysis of data from the Zoe Covid Study.
The study uses real-world data gathered via a mobile phone app with over a million active users, who log details on their vaccinations and test results, which is then analysed by researchers including scientists at King’s College London.
The study drew on more than 1.2mn test results and participants.
Protection from the AstraZeneca vaccine fell from 77 per cent one month after a second dose to 67 per cent after four to five months.
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