Herd or population immunity, “with a virus” like covid “causing so many reinfections, is not technically possible”. There can be, in people who become infected, “a momentary refractoriness, but which lasts a few months. With germs so contagious and, above all, which have the ability to infect again, there is no possibility”. Walter Ricciardi, professor of Hygiene at the Catholic University and advisor to the Minister of Health Roberto Speranza, says this to Adnkronos Health.
Herd immunity, explains Ricciardi, “is acquired when you get permanent immunity, thanks to a vaccine or a natural infection. With Sars-CoV-2 this does not happen precisely because it is extremely contagious and able to reinfect “.
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