The fact that the majority of populations infected with Sars-CoV-2 do not show noticeable symptoms could be due to the good memory of our immune system, according to several independent studies, two of which are published in the journal Nature. This work, carried out in Singapore, Germany, the Netherlands or the United States, found that the immune system of 10% to 50% of people who had never been in contact with the virus was able to recognize it.
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This memory is put in place when T lymphocytes, immune cells in the blood and lymph, specialize to recognize parts of the virus on the surface of infected cells. Pivots of the adaptive immune response, they then activate B lymphocytes, which produce antibodies against the virus, and other T lymphocytes, responsible for killing infected cells. Once the infection is eradicated, veteran B and T lymphocytes will persist in the body and form the immune memory against the
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