NYT > World News A Week Later, Russia Hasn’t Said What Pathogen Killed Plague Researcher Par : Paul Sonne and Julian E. Barnes 10 octobre 2026 à 13:09 Experts said they believed that with modern testing technology, the Russian authorities should know the answer by now. © Associated PressThe Irkutsk Anti-Plague Research Institute of Siberia and the Far East in Irkutsk, Russia, on Wednesday. A 28-year-old researcher there died of an unexplained pneumonia.