President Donald Trump speaks during an event about loosening a federal refrigerant rule, in the Oval Office at the White House, Thursday, May 21, 2026, in Washington. (AP Photo/Jacquelyn Martin)

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)

Chart showing historic Ebola outbreaks. (AP Digital Embed)

Map showing suspected Ebola cases as of May 18, 2026. (AP Digital Embed)

Medical staff carry an Ebola patient to a treatment center in Rwampara, Congo, Thursday, May 21, 2026. (AP Photo/Moses Sawasawa)