I agree with Jet, we need some of them and they're the good ones. I'm not an expert on this but our bodies have their own antibodies as well that eliminates the viruses that come to us.
And when there's a newer one that they cannot defeat, that's where our bodies will start to react.
If I have learned anything from the coronavirus is to live one day at a time because even our own body can wreak havoc on it's self
Live your life the way you want it but don't harm it.