One who is opposed to the administering of vaccines, especially to children. "Vaxx" is short for "vaccine." Anti-vaxxers usually believe that vaccines are linked to illness.
anti-vax
Opposed to the administering of vaccines, especially to children. "Vax" is short for "vaccine." Many people believe that the anti-vax movement puts our whole society at risk.
anti
(ˈænti and ˈæntɑɪ)
1. n. someone who is against someone or something. All the antis are going to vote for it this time.
2. mod. against someone or something. (Sometimes with the force of a preposition.) I’m not anti the proposal, I just have some questions.