That happens when you're a glass 7% empty and not a glass 93% full kind of guy.quote stilly river sage.What is the failure rate of measles vaccine?
"Approximately 2% to 7% of children who receive only 1 dose of MMR vaccine fail to respond to it, i.e., they experience primary vaccine failure. MMR vaccine failure can occur because of passive antibody in the vaccine recipient, immaturity of the immune system, damaged vaccine, or other reasons."
quote from the internet.
the quote mentions that having a ppor immune system is one of the reasons for the small percentage of vaccine failure.

so what causes poor immune system?one possibilty is malnutrtion and poor diet.
I have had covid vaccinations.I am, not anti vaccination
Vaccination is not a cure all as the facts show, although obviously it in many cases helps