Passengers on several American Airline flights in the U.S. may have been exposed to hepatitis A by a flight attendant, the Centers for Disease Control and Prevention says.
The CDC said the flight attendant had diarrhea on several flights during the period in which he was considered infectious, so it is investigating and notifying passengers who may have been affected.
One of those flights was between San Francisco and Charlotte on Sept. 21, according to the Mecklenburg County Public Health Department in North Carolina, which told ABC News that it's contacted 18 local passengers, all of whom received hepatitis A vaccinations.
American Airlines would not confirm that one of its flight attendants had hepatitis A or another disease, ABC News reported.
Hepatitis A -- which affects the liver -- is usually contracted by ingesting fecal matter or contaminated food or water.