So if we have a lot better rates than 91% AND the # of deaths is still zero, what are you worried about exactly?
And if you saw evidence that the number of deaths from the MMR vaccine was greater than 0, would that influence your viewpoint at all?
It would not though clearly one should strive for lower rates of vaccination complications and deaths.
Lower vaccination rates portend higher rates of infection— during the 1970’s and 1980’s the annual incidence of measles infections was 0.06 per million, now it is 1-2 per million.. still minute but nevertheless a 20 to 30 times increase in number of cases per million. If measles becomes endemic again in the population then we could see prevaccination rates in the unvaccinated population of 1.875 to 2.5% with all the assorted badness associated with measles (not to mention rubella and mumps) as outlined above