antivaxxer

or an·ti-vax·xer,or an·ti·vax·er

[an-tee-vak-ser, an-tahy-]
noun Informal: Disparaging.
  1. a person who distrusts or is against vaccination, especially a parent who refuses to have a young child vaccinated.

Origin of antivaxxer

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018