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There’s nothing in Jewish teachings[0] to justify an anti-vaccination stance. However, as an insular community it is particularly susceptible to anti-vaccine misinformation[1].

0. In numerous states parents wishing not to vaccinate their children are permitted to sign a document stating that their religious convictions do not allow them to; based on this signature the child will then be permitted to attend school under the law. It is reported that small numbers of parents in Jewish schools have signed such documents. For a parent of a yeshiva student to sign such a statement in the name of Judaism is not just inappropriate, it is false. Whether a posek will rule that childhood immunizations are obligatory in halakhah or are discretionary (but highly advisable), there is no position in halakhah that says there is any prohibition or compelling reason to refrain from such vaccinations.

http://www.hakirah.org/Vol13Bush.pdf

1. “How Orthodox Jewish Nurses Are Fighting 'Anti-Vaccination Propaganda' Targeting Their Community”

http://gothamist.com/2019/03/26/orthodox_jewish_nurses_vacci...