The Los Angeles County Department of Public Health has confirmed the fourth case of measles this year in an international traveler who recently visited LAX Airport.
The department made the announcement on Thursday, saying the person had recently visited LAX and several other LA County locations while infectious. So far, all of the LA County cases have been tied to international travel, according to public health officials.
Public Health said the person arrived at the Tom Bradley International Airport Terminal (Terminal B) at LAX on Feb. 9 on Singapore Airlines Flight #0038. Officials say anyone who was in Terminal B between 7:30 p.m. and 9:40 p.m. on that day may have been exposed to the virus.
In partnership with the Centers for Disease Control and Prevention (CDC), passengers who were seated near the infected traveler will be notified.
"Measles spreads easily and can lead to serious complications, including pneumonia, brain swelling, and even death," said L.A. County Health Officer Dr. Muntu Davis. "We urge everyone to confirm their immunity and get the MMR vaccine if needed, especially before traveling."
Public Health says the infected individual also visited several public locations over several days and may have exposed others.
List of locations and times when people may have been exposed:
Officials say people who were at any of the locations during the same dates and times may be at risk of developing measles 7 to 21 days after exposure. They urge people to confirm their protection against the measles and monitor symptoms.
People who remain symptom-free for more than 21 days after being exposed are no longer considered at risk.
Measles is a highly contagious virus that spreads through airborne droplets when an infected person coughs or sneezes.
Common symptoms for measles include:
Public health officials say the most effective way of preventing the measles is with the measles, mumps and rubella (MMR) vaccine. Individuals who have previously had the measles or have received the recommended MMR vaccine are considered protected from the virus.
On Jan. 30, LA County confirmed its first case of measles in 2026 in a resident who had recently traveled internationally. Officials did not provide a list of locations where the resident could have exposed anyone.
"In the United States, as of February 12, a total of 910 measles cases have been reported this year, which is the highest number of measles cases in January since the United States achieved elimination status in 2000,"
the Department of Public Health said.