[Enginerrrd]

Yeah for sure, I think this is true for a lot of people, so perhaps "avoid" is the wrong word.

I did once calculate how many flu shots you'd have to get to save one human life based on heuristics and data on estimated length of infection chains and R0 for flu. I can't quite remember, but it's something like 100-people-years per life saved. So 10 people for 10 years might save a life by not infecting someone vulnerable. Very approximate.