Growing up in the 50s, everyone got the measles, and got over it. Back then we all had what were called the “childhood illnesses” ie chickenpox, measles, and mumps. No vaccines available, no “treatment’ either—just rest, and probably vitamins would have helped a bit. But we all just got them, passed them around, and life went on. No idea why all of a sudden measles is this scary menace to humanity. It feels like global warming.
All the pre 1900 data is pure BS.
Whoever made that up is a criminal and a liar.