But vaccine requirements are only for school enrollment. There are none on the general public- there is no parallel for adults like there is for school age kids. There are no laws about staying up to date on vaccines that wane over time and booster uptake among the adult population is extremely low. Only 1 in 4 American adults have had a DTaP booster since middle school. Pregnant women are often routinely screened for presence of antibodies against things we were vaccinated against as kids. I personally opted to be revaccinated after delivery for measles, mumps, and rubella because I had no protection at age 30 despite completing the series at age 4. I wasn’t required to though.