‘Herd immunity’ sounds intuitive. yet part of me leans toward this is a bullcrap idea. Viruses - virus. We will find out in the next cold and flu season. Hold on to your butts (to steal from Jurasic Park)
It’s a real idea, I read up on it a bit on the late 90s when we were involved doing computer antivirus rollouts for corporate clients. Many of the same concepts apply. Viruses have to have a host, and if there are no hosts because a sufficient number either has immunity from having had the virus, or from having a vaccine, then the virus doesn’t propagate. And that’s herd immunity.