antivaxxer

or an·ti-vax·xer or an·ti·vax·er

[ an-tee-vak-ser, an-tahy- ]
/ ˌæn tiˈvæk sər, ˌæn taɪ- /

noun Informal: Disparaging.

a person who distrusts or is against vaccination, especially a parent who refuses to have a young child vaccinated.

Origin of antivaxxer