Knowing the number of people infected with Covid-19 since the start of the epidemic is crucial to estimate the risk of a possible second wave. The more they are, the greater the collective immunity, the less the virus can circulate " freely ". Alas, the number of virological tests carried out during this phase was far too low to give us even a vague idea ... There are only 150,000 positive PCR tests, while millions of French people have more likely been infected.
Read also: How do the different virus screening tests work?
When an individual gets sick his body reacts to fight the virus. This immune response is characterized (most of the time) by the presence of antibodies in the blood. Last April, the French Blood Establishment (EFS) had therefore launched a large study in partnership with the Pasteur Institute to try to estimate the proportion of the population who had developed such antibodies by analyzing the pockets collected during donation campaigns
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