If they protect us from severe forms of the disease, do anti-Covid vaccines completely block the transmission of the virus?
The first studies on the question are rather encouraging.
Two of these were carried out in the UK, where more than 20 million people have already received a first dose.
Looking at the results of thousands of tests carried out each week on caregivers in Cambridge, researchers found four times more positive tests in unvaccinated people than in those who had received a first dose of Pfizer vaccine at least twelve days earlier. .
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"Excellent news,"
said Mike Weekes, one of the authors of this preprint study.
The Siren study, also carried out on British caregivers, comes to quite similar conclusions: one dose of Pfizer vaccine reduces the risk of infection by 72% after three weeks, while two doses reduce it by 85% seven days after the second injection.
These English studies
“corroborate
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