Health officials in Montgomery County are investigating and contact tracing after a child was diagnosed with measles.

In the last year, several cases of measles have been identified in the Philadelphia region; last winter, a measles outbreak sickened nine people and sent six to the hospital in Philadelphia.

The first case of measles in Pennsylvania this year has been confirmed, and though there is no sign of the infection in the Lehigh Valley, local health networks are preparing for the worst.

Montgomery County officials have released additional details about the region’s first 2025 confirmed case of measles, including the places the unvaccinated child visited before their emergency room diagnosis.

A confirmed case of measles in an unvaccinated child is under investigation by Montgomery County health officials.

Montgomery County, Pennsylvania, officials say a baby who has been diagnosed with measles visited two health care facilities in the area while he was infectious.

A patient who came to a hospital emergency room in Montgomery County is Pennsylvania's first confirmed measles case this year amid a national surge of the highly contagious virus, according to health officials.

The unvaccinated child visited the Children's Hospital of Philadelphia's King of Prussia campus emergency room on Feb. 26, the county's Department of Health said.

The Montgomery County Department of Health and Human Services' Office of Public Health is investigating a confirmed case of measles in an unvaccinated Montgomery County child.