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Effectiveness of Pfizer, AstraZeneca wanes within six months after second vaccination

Source : 112 Ukraine

The Pfizer jab has been shown to be 88% effective at preventing Covid-19 infection a month after the second dose
19:47, 25 August 2021

Open source

The protection provided by two doses of the Pfizer/BioNTech and the Oxford/AstraZeneca vaccines starts to wane within six months, new research suggests. The Guardian reported this.

The Pfizer jab has been shown to be 88% effective at preventing Covid-19 infection a month after the second dose. After five to six months, protection decreased to 74%, PA reports.

The AstraZeneca vaccine provides 77% protection against infection one month after the second dose. After four to five months, protection decreased to 67%.

This latest analysis from the Zoe Covid study drew on more than 1.2 million test results and participants. Real-world analysis would be expected to show less protection than clinical trials, and the vaccines were not trialled against the now dominant Delta variant.

Related: WHO chief urges to delay Covid-19 booster shots and donate vaccine to poor countries

Prof Tim Spector, lead scientist on the study, said: “In my opinion, a reasonable worst-case scenario could see protection below 50% for the elderly and healthcare workers by winter.

“If 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.”

Earlier, new side effects were detected in Pfizer, Moderna vaccines.

Related: Poland hands Ukraine 650,000 doses of AstraZeneca vaccine

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