For measles virus and the vaccine, it's a no-brainer.

It's ridiculously infectious, R0~12-18.

It's s a killer. >107K in 2023, mainly unvaxed kids in LMIC.

Vax prevented ~60M from 2020-23.

It also kills memory B cells, so no "natural immunity" for "healthy" immune systems🤦‍♂️

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