Le résumé : https://www.bmj.com/content/372/bmj.n217
A preliminary report from the Clalit Research Institute compared the infection data of 200 000 people aged 60 and over who were not vaccinated with the infection data of 200 000 people of the same age group who received one vaccine dose and were monitored for at least 11 days from the date of vaccination. On day 14 there was a “significant decrease of about 33% in the rate of positive tests for the coronavirus” among those who had been vaccinated. This decrease remained the same between days 15 and 17.
If, for example, efficacy after one dose was 33% but efficacy after two doses was 60%, the UK policy would still be justified. Similar arguments apply in relation to efficacy against serious disease.”