> I don't think "we've always mandated vaccines" is a good argument. Applying the label of "vaccine" to something does not guarantee anything.

That's a fair point, I agree.

> Especially when the definition was changed in the past year.

Could you elaborate on this part? I went ahead and checked the dictionary definition:

> A substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease.

Which tracks with what I remember from my molecular bio degree ten years ago.