Five major American airports are set to begin stricter screening procedures to detect arriving West African travelers who may be infected with the Ebola virus, according to federal transportation and security officials.

Border personnel at New York’s John F. Kennedy International Airport, which receives nearly half the country’s incoming travelers from Guinea, Liberia and Sierra Leone will start questioning and checking temperatures for those passengers starting Saturday.

Similar measures at Washington Dulles International Airport, Newark Liberty International Airport in New Jersey, Chicago O’Hare International Airport and Hartsfield-Jackson Atlanta International Airport were expected to be implemented next week.