MPox: infection numbers in the US are generally low in the US - the weekly average is generally between 3 and 18 cases per week. I haven’t tracked transmission vectors in a couple years - I think the last time I checked was around 2022-23. From memory, at that time, the main vector was men who had sex with men, and then people who had sex with infected people. The CDC’s recommendation list for who should get vaccinated still seems to focus on those groups, as well as travelers to areas where MPox is endemic.

Measles: in the US, this mostly depends on when you were born/vaccinated. If you were born before 1957, you are presumed to be immune because measles is so contagious and it was so prevalent back then. If you were vaccinated before 1967, you should get a booster shot: the vaccine they used back then was less effective than the later vaccine. If you were vaccinated after 1967 and before 1989, you should consider getting another shot: up until 1989, they believed that a single dose gave lifetime immunity, but then they realized a second dose was needed. People who received two doses of vaccine after 1989 are presumed immune.