Officials at airports in four American cities are scheduled to start taking the temperatures of passengers from three West African countries as part of a stepped up Ebola screening programme.
Federal health officials say the entry screenings that start today add another layer of protection to halt the spread of the Ebola.
Screeners will use no-touch thermometers to try to find passengers with fevers.
The screenings started at New York's Kennedy International Airport on Saturday. Screenings will now be conducted at Washington Dulles, Chicago O'Hare, Newark's Liberty and Hartsfield-Jackson in Atlanta.
Officials say about 150 people travel daily from or through Liberia, Sierra Leone or Guinea to the United States. Nearly 95 per cent of them land first at one of those five airports.
