As measles cases and hospitalizations increase across the United States and internationally, the Connecticut Department of Public Health (DPH) is urging all residents to verify their vaccination status. Currently, there are no cases of measles in Connecticut. As of March 13, 2025, the CDC has been notified of 301 confirmed U.S. cases of measles across 15 jurisdictions, more than reported for all of 2024. In particular, DPH is strongly recommending a dose of the MMR vaccine be given to infants 6-11 months of age who will be travelling internationally or to areas in the United States with active measles transmission. The dose should be given at least two weeks prior to travel. Additionally, some adults who received their MMR vaccines between 1963-1967 may have received a different version of the measles vaccine that was less effective.