I don't want to derail the thread, but I thought the vaccine was required by law for preschoolers in most if not all states.
That was my thought too, that the DTP vaccine is required by law -- but there are all these lame-brains nowadays with conspiracy theories about vaccines -- who knows but the parents with kids in that school are among those idiots, defying the law just to be "modern". They probably eat kale too.
Andria