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dpa
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Experts who have been tracking the effectiveness of the Pfizer/BioNTech vaccine have found that the risk of Covid infection increases the longer it is since people had a second dose.
The study backs up the need for booster doses to prevent people suffering breakthrough infections as immunity wanes, according to the team, who published their findings in the British Medical Journal (BMJ). Experts from the Research Institute of Leumit Health Services in Israel found a gradual increase in the risk of Covid-19 infection from 90 days after people received a second dose of the Pfizer/BioNTech vaccine.
Israel was one of the first countries to roll out a large scale Covid-19 vaccination campaign in December 2020, but has been battling a resurgence in infections and has been looking closely at waning immunity. The experts examined electronic health records for 80,057 adults (with a average age of 44) who had a PCR test between mid-May and September at least three weeks after their second vaccine injection. None of the people in the sample had evidence of previous Covid-19 infection.
Of the group of 80,057 people, 7,973 (9.6 per cent) had a positive test result.
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25/11/2021
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