True, though from my understanding, in some sense herd immunity was reached for the original strain and even delta, both of which are pretty much eradicated fro

True, though from my understanding, in some sense herd immunity was reached for the original strain and even delta, both of which are pretty much eradicated from the US. Those were the deadliest strains as well. What happened is that COVID started mutating much faster than expected in ways that it can avoid the immune system.