Japanese health authorities are warning people who travel to central Africa to stay away from areas where cases of Ebola have been reported.
An outbreak in the Democratic Republic of the Congo has killed more than 1,600 people since last August, mostly in North Kivu province. Earlier this month, a woman who traveled to neighboring Uganda was found to have been infected.
The World Health Organization declared the Ebola outbreak an international health emergency on Wednesday.
Japan's health ministry is urging visitors to Congo and Uganda to take precautions such as staying away from dead animals and avoiding raw meat.
People who have traveled to Japan from these countries are being asked to report any changes in their health to the quarantine authorities for three weeks after their arrival.
Ebola hemorrhagic fever is an infectious disease caused by the Ebola virus. It is spread by contact with the blood or body fluids of an infected person.
Ebola is a lethal disease. An outbreak can lead to many deaths.
Over 11,000 people died of Ebola in the West African nations of Guinea, Liberia and Sierra Leone between 2014 and 2016.