[frm88]

Well, measles, in a rich country with good healthcare and healthy children is mostly (mostly!) an inconvenience. You can expect to survive it without much consequence.

https://www.cidrap.umn.edu/measles/measles-does-long-term-da...

After severe measles, children lost a median of 40% (range, 11% to 62%), and after mild measles they lost 33% (range, 12% to 73%), of their total preexisting pathogen-specific antibody repertoires. Paired, healthy controls retained approximately 90% of their repertoires over similar or longer durations.

You might want to rethink your above statement.