Chart showing historic Ebola outbreaks. (AP Digital Embed)

A woman cries as Red Cross workers carry the coffin of a person who died of Ebola from a health center in Rwampara, Congo, Wednesday, May 20, 2026. (AP Photo/Moses Sawasawa)

The Memorial Circle, where President Donald Trump has proposed building an arch to commemorate the United States' 250th anniversary is seen, Tuesday, May 19, 2026, in Washington. (AP Photo/Alex Brandon)

Argentine scientists collect traps placed at different points across Ushuaia, Argentina, Tuesday, May 19, 2026, as part of an investigation for the source of the hantavirus outbreak on the MV Hondius cruise ship. (AP Photo/Lujan Agusti)

Argentine scientists collect traps placed at different points across Ushuaia, Argentina, Tuesday, May 19, 2026, as part of an investigation for the source of the hantavirus outbreak on the MV Hondius cruise ship. (AP Photo/Lujan Agusti)

Argentine scientists collect traps placed at different points across Ushuaia, Argentina, Tuesday, May 19, 2026, as part of an investigation for the source of the hantavirus outbreak on the MV Hondius cruise ship. (AP Photo/Lujan Agusti)

A U.S. doctor, who was in contact with people infected with Ebola in Uganda, arrives in a hospital in Prague, Czech Republic, Thursday, May 21, 2026. (AP Photo/Petr David Josek)

Red Cross workers carry the body of a person who died of Ebola into a coffin at a health center in Rwampara, Congo, Wednesday, May 20, 2026. (AP Photo/Moses Sawasawa)