British media quoted British researchers on August 25 as saying that Oxford-AstraZeneca and Pfizer-BioNTech's new coronavirus pneumonia (COVID-19) vaccine will have a protective effect within 6 months after two doses of vaccination. It began to fade, highlighting the need for booster vaccination.
Analysis of data collected by the Zoe Covid Symptom study in the United Kingdom showed that the effectiveness of Pfizer vaccine in preventing infection with the new crown virus dropped from 88% to 74% after 5 to 6 months after the second dose.
The effectiveness of people vaccinated with AstraZeneca's vaccine dropped from 77% to 67% after 4 to 5 months.
The picture shows a Pfizer vaccine at the Cardiff Vaccination Center in the UK on December 8, 2020.
(Getty)
This study is based on data from 1 million app users, including people who claim to have been vaccinated but infected, and a control group that has never been vaccinated.
Past data analysis shows that the vaccine can provide at least 6 months of protection.
Tim Spector, professor of genetic epidemiology at King's College London, who leads the "Zoe's study on the symptoms of new coronary pneumonia", said that in the worst-case scenario in the future, the protection rate of the elderly and medical staff in winter It may be less than 50%.
Spector is also the lead investigator of this study.
He co-founded the "Zoe New Coronary Pneumonia Symptom Study".
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He told the British Broadcasting Corporation (BBC): "This draws our attention to the need to take some action. We cannot sit back and watch the protection slowly fade, and the number of cases is still high and the chance of infection is still high."
