The Pennsylvania Health Department on Wednesday reported 1,222 measles cases in the state, up 86 cases from a week earlier.
Measles-related hospitalizations this year stand at 225, according to state health department data.
The state health department has reported five measles-related deaths so far.
The CDC has confirmed two measles-associated deaths in 2026, though it has not identified the states involved.
The US has recorded 4,080 measles cases this year as of October 8, according to CDC data.
The CDC said on Tuesday it would deploy additional support to Pennsylvania to help investigate the outbreak.
