52.4% of French people had antibodies by mid-June

By mid-June, 52.4% of French people, or more than one in two, had thus developed antibodies against the virus, according to these results (the confidence interval is between 49.8% and 55.7 %). In mid-February, they were only 13.7%, according to Public Health France.

While this estimated seroprevalence (proportion of people carrying antibodies) is similar in men and women (around 52%), its increase compared to mid-February was particularly significant in people aged 60 and over. Antibodies were detected in mid-June in nearly 80% of residents at least 70 years old, notes The Parisian, or the population that has been vaccinated as a priority.

Differences between regions

While seroprevalence is on the rise in all regions between February and June 2021, not all are equal.

The proportion of the population having developed antibodies against Covid-19 in mid-June is thus higher in Île-de-France (60.1%) and in the Grand Est (55.6%) than in Provence -Alpes-Côte d’Azur (47.2%) or in Occitanie (46%). It is particularly low in the West Indies: 30.7% in Guadeloupe and 21.4% in Martinique.

Vaccination shows its effectiveness

These preliminary results “already suggest a significant gain in immunity in the French population, in connection with vaccination, with seroprevalences much higher than those observed during previous epidemic waves”, writes Public Health France.

In other words, the proportion of French people who have developed antibodies is greater since the extension of vaccination in the spring than it was in February after two strong epidemic waves. This suggests that vaccination is partly responsible for the sharp increase in seroprevalence, more than infections.

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