More than one in two French people hadanti-SARS-Cov-2 in mid-June, whether or vaccinated, according to of Public Health France, the Institut Pasteur and the . Between June 7 and 13, seroprevalence stood at 52.4% in the French population against barely 13.7% last February. It even reached 79.5% among those over 80 and 60.1% in Ile-de-France. This spectacular progression is, on the one hand, linked to the third from in April, but especially in the campaigns of : by June 15, 46% of the population had received at least one dose of and 25% were fully vaccinated.
« These results will soon be refined by new analyzes but already suggest a gain inimportant in the French population, in connection with vaccination, with seroprevalences much higher than those observed during previous epidemic waves », Observes Public Health France. Unlike previous waves, where the circulated mainly in young people (who therefore had more antibodies), seroprevalance is now higher in the oldest categories, priority for vaccination.
Thewas, on the other hand, much lower in the overseas departments and regions, with a proportion of people having anti-SARS-Cov-2 antibodies of 30.7% in Guadeloupe and 21.4% in Martinique in mid-June, which explains the severe resumption of in recent months in these territories.
The seroprevalence data are based on the analysis of tubes taken from laboratory blood samples, drawn at random by sex, age group and region to be representative of the French population. The presence or absence of anti-SARS-CoV-2 antibodies is thus detected, the latter indicating an immunity conferred by past contamination or. Note, however, that it is possible to maintain immunity while having .