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Do Covid-19 vaccines prevent infection and transmission?
April 27, 2021CNRS
Studies in widely vaccinated populations, such as those in Israel and the UK, have confirmed in vivo the protection promised by different vaccines. The risk of vaccinated individuals transmitting the virus may also be reduced. Three experts working at the INEM offer their insights.
Israel and the UK, which launched their vaccination campaigns at an early stage, enjoy considerable coverage of their populations,1 which back in January and February enabled the large-scale collection of preliminary data at a time when the so-called UK variant was already widely present in these countries. Following the studies by pharmaceutical companies involving cohorts of a standard size in order to obtain market authorisation for their vaccines (20,000 to 30,000 people for Pfizer-BioNTech and AstraZeneca/Oxford), results on hundreds of thousands of individuals are now available. The exceptional situation in these two coun