так вот тут описано почему https://iz.ru/1217775/mariia-nediuk/parazitelnyi-effekt-kak-gelminty-obmanyvaiut-immunitet-pri-sovid-19https://www.thelancet.com/journals/eclinm/article/PIIS2589-5370(21)00334-5/fulltext?rss=yes&fbclid=IwAR21Fds0vPgb222AZAPjmOq-JTrVUb3b9AQpx6nOl85rFn-Vr8v5ToSBscI#%20