Travelers arriving from Uganda to the United States will be screened for Ebola as a precaution aimed at preventing the outbreak in the African country from spreading, Washington said Thursday.

With "no suspected, probable, or confirmed cases" of Ebola having been reported beyond Uganda, the risk in the U.S. is seen as low right now, said a senior administration official who was not authorized to publicly discuss the screening protocols and spoke on condition of anonymity. The official described the screening move as "as an additional precaution."

The screenings will begin rolling out immediately, with full coverage from passengers from Uganda expected to be in place by the week’s end.

Travelers who have been in Uganda at any point during the past 21 days, which is the incubation period for the virus, will be redirected to one of five American airports for Ebola screening: JFK International Airport in New York, Washington-Dulles International Airport, Newark Liberty International Airport in New Jersey, Chicago-O’Hare International Airport and Hartsfield-Jackson Atlanta International Airport.

Those passengers will have a "temperature check, risk assessment, visual symptom check, and contact information verification" conducted by the Centers for Disease Control and Prevention (CDC). Authorities will share that information with local health departments at the travelers' final destination. The screenings will begin rolling out immediately, with full coverage from passengers from Uganda expected to be in place by the week's end.

The administration says about 145 people per day enter the U.S. from Uganda, with most already arriving at one of the five airports, which serve as large airline hubs. Anyone scheduled to fly into a different airport will be rebooked by their airline, the administration said.

Ebola, which manifests as a viral hemorrhagic fever, is spread through contact with the bodily fluids of an infected person or contaminated materials. Symptoms include fever, vomiting, diarrhea, muscle pain and at times internal and external bleeding.