WASHINGTON — Federal agents at U.S. airports are watching travelers from Africa for flu-like symptoms that could be tied to the recent Ebola outbreak, as delegations from some 50 countries arrive in the nation’s capital for a leadership summit this week.

Border patrol agents at Washington’s Dulles International and New York’s JFK airport in particular have been told to ask travelers about possible exposure to the virus and to be on the lookout for anyone with a fever, headache, achiness, sore throat, diarrhea, vomiting, stomach pain, rash or red eyes. Andrews Air Force Base in Maryland, which will receive several African heads of state, is screening passengers too, while U.S. Secret Service agents in charge of security for the three-day summit have been briefed on what to look for and how to respond, officials said Monday.

If a passenger is suspected of carrying the deadly virus, they would be quarantined immediately and evaluated by medical personnel, according to the Centers for Disease and Prevention, which provided the additional training to local airports.

“There is always the possibility that someone with an infectious disease can enter the United States,” CDC spokeswoman Barbara Reynolds said Monday. “The public health concern is whether it would spread, and, if so, how quickly.”