Measles infections reported in Lea County tripled last week from 10 to 30 as the viral outbreak that caused at least one adult’s death continued to spread, and health officials increased their investigations to uncover more cases of the disease.

Philadelphia hospital patients were also warned about possible exposure to the highly contagious virus just days after a warning for Dulles airport travelers.

Los Angeles County in California, Suffolk County in New York and Howard County in Maryland detected their first confirmed cases of measles this year, while Oklahoma reported two possible cases, local health authorities said this week.