Dear Doing,
Herd immunity is less than that. I thought kids out of school was because of a child with kidney disease got chicken pox and will never be the same. That school had enough and removed all unvaccinated students. And other large schools followed. The smaller schools did not. Large schools have the ability to deal with immunocompromised children. Small schools can deal with parents that do not vaccinate.
An eliminated disease does not come back even without herd immunity. (i. e. smallpox) Herd immunity protects us from all getting sick. Compare coronavirus where almost all the people in the same house get in once. As opposed to the flu where some get it in October, some in Dec/Jan, one in the spring, and some seem to evade it completely. There will still be small pockets until it is eliminated.
Menu