Why some people never get Covid 19
דיון מתוך פורום מחלות זיהומיות
https://news.yahoo.com/can-people-be-naturally-immune-or-resistant-to-covid-19-185050422.html https://qz.com/2159984/what-we-know-about-why-some-people-never-get-covid-19/?utm_source=YPL