This is also why people refusing the MMR vaccine is really, really hurtful to vulnerable populations. Measles R0 is like 15 or something - it's crazy infectiou

This is also why people refusing the MMR vaccine is really, really hurtful to vulnerable populations. Measles R0 is like 15 or something - it's crazy infectious. So one kid in a daycare or class of 20 with parents who don't believe in vaccines is enough to push you under herd immunity. Bake in the fact that MMR vaccine is only ~97% good against measles, and you end up with a bunch of dead kids. We got lucky last time around in Seattle area, in that it only cost us $1m and 0 deaths to get it under control.