Earlier quoted context omitted.
> From the viewpoint of a healthy young person, the risk/reward ratio of taking a vaccine is bad. Absolutely false. The disease can and does have severe and sometimes long-lasting impacts on young healthy people. The mRNA vaccines don't have any impact worse than a sore arm. And we aren't getting to a herd immunity level of vaccination if young people are unvaccinated.
But why are we only considering vaccination with regards to herd immunity. Shouldn't we also be including natural immunity from previous covid infection?
Even vaccines provide reduced protection from new variants. I read today that most effective vaccine only provides a ~70% chance or so of protection from the Delta variant in the UK. Hence the talk of booster shots before the initial vaccines were rolled out.
Herd immunity comes from vaccination. It's not really feasible for it to occur naturally because the virus will continue to mutate and reinfect people indefinitely.