That's how it usually goes with virus, it's their version of natural selection. If they're too strong, they kill the host and that's not good for the perpetuation of the species, so those variations die out. The weaker but more contagious versions are the ones that have more success in reproducing. It's quite fascinating to think about.
azahel452 t1_jdjsqtu wrote
Reply to comment by joshuas193 in What happened to the old COVID variants, like Delta? Could they come back? by number1dork
That's how it usually goes with virus, it's their version of natural selection. If they're too strong, they kill the host and that's not good for the perpetuation of the species, so those variations die out. The weaker but more contagious versions are the ones that have more success in reproducing. It's quite fascinating to think about.