> Some vaccines use a "weakened" form of the pathogen to trigger immunity response without causing actual disease For anyone who wants to look up more, the wor

> Some vaccines use a "weakened" form of the pathogen to trigger immunity response without causing actual disease For anyone who wants to look up more, the word "attenuated" is used to describe this. > This is not the case with most modern vaccines It's actually really common, just not with flu shots: https://www.hhs.gov/immunization/basics/types/index.html https://www.hhs.gov/immunization/basics/types/index.html