or an·ti-vax

[an-tee-vaks, an-tahy-]
adjective Informal: Disparaging.
  1. of, relating to, or noting people, especially parents of young children, who distrust or are against vaccination: the antivax movement.

Origin of antivax

1990–95; anti- + vax (shortening and alteration of vaccination) Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018