PENNSYLVANIA — Two Pennsylvania residents have died after contracting measles, marking the first reported measles deaths in the United States this year, according to state health officials. Both were unvaccinated residents of Lancaster County.

The deaths come as measles infections continue to spread across the country. The United States is experiencing its highest number of measles cases in more than 30 years, according to reporting based on health officials and federal data.

Measles is highly contagious and can cause serious complications, particularly among people who are unvaccinated or otherwise vulnerable.

The Pennsylvania deaths are likely to intensify the national discussion surrounding measles vaccination, childhood immunization rates and outbreak preparedness.

Health authorities are continuing to monitor infections and exposure risks while urging eligible people to follow recommended vaccination guidance.

The deaths add urgency to efforts to contain measles outbreaks and prevent further transmission as U.S. public-health officials confront declining vaccination coverage in some communities.