Technology Individual or collective, immunity will be the key to...

Individual or collective, immunity will be the key to deconfinement

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DECRYPTION – Recent studies tend to confirm the existence of acquired immunity against SARS-CoV-2.

A photo taken in March 2020, in Paris, shows two women wearing a protective mask walking along the empty banks of the Seine.
A photo taken in March 2020, in Paris, shows two women wearing a protective mask walking along the empty banks of the Seine. BERTRAND GUAY / AFP

In a somewhat simplistic view of immunity, it would be enough to become infected with a virus to develop antibodies, heal, be immunized for a more or less long duration and no longer be contagious. The reality is more complex. Thus, according to researchers from the University of Shanghai, whose work has just been sent to the scientific prepublication site medRxriv, the immunity acquired during an infection with Sars-CoV-2, is not as uniform as we think. “About 30% of cured patients produce only a low level of neutralizing antibody”, write the Shanghai researchers, who scrupulously followed in 175 patients the evolution of the level of these antibodies, the most important to protect an individual from reinfection.

“In most infections with RNA viruses like this coronavirus, antibodies appear after a few days, and, depending on the patient, these antibodies will reach a sufficient concentration in the blood, explains Eric

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