Prof. Dr Georg Nagel poses for a photo during a ceremony in which he was presented with the University of Würzburg’s 2024 Röntgen Medal (Science Prize), in May 2024, in Würzburg, Germany. (Rudi Merkl, University of Würzburg via AP)

This undated photo released in 2019 by the Irkutsk Anti-Plague Research Institute of Siberia and Far East, shows the institute workers in a lab. (The Irkutsk Anti-Plague Research Institute of Siberia and Far East via AP) ADDITION: adding photo was released in 2019

A map showing the locations of the Irkutsk Anti-Plague Research Institute and the nearby quarantined hospital. (AP Digital Embed)

FILE - Arizona voters come and go as cast their ballots at a polling location on primary election day, Tuesday, July 21, 2026, in Phoenix. (AP Photo/Ross D. Franklin, File)

President Donald Trump speaks with reporters before walking to board Marine One on the South Lawn of the White House, Monday, Oct. 5, 2026, in Washington. (AP Photo/Tom Brenner)

President Donald Trump arrives on Air Force One at Central Nebraska Regional Airport, Monday, Oct. 5, 2026, in Grand Island, Neb. (AP Photo/Alex Brandon)

Parti Quebecois Leader Paul St-Pierre Plamondon watches results come in alongside his spouse Alexandra Tremblay, children Maurice, Laurette and Henri in Montreal, Quebec on Monday, Oct. 5, 2026. (Graham Hughes/The Canadian Press via AP)

Canada Prime Minister Mark Carney rises during Question Period in the House of Commons on Parliament Hill in Ottawa on Monday, Oct. 5, 2026. (Justin Tang/The Canadian Press via AP)