Rav Moshe Heineman’s Vaad Harabonim of Baltimore just issued a statement
We consider it a Halachic obligation for every member of the community – adults and children – to be properly vaccinated according to the standards and schedules established by the medical community as outlined by the CDC (https://www.cdc.gov/vaccines/schedules/index.html). These standards have been responsible for the eradication of many terrible diseases and have significantly improved public health in our country. As we are seeing in the current measles epidemic, ignoring or undermining the policy of universal vaccination endangers the community and is Halachically wrong.