Siberian lab worker's suspected plague death puzzles experts

A Russian lab technician's suspected plague death at a Siberian research institute has puzzled experts, with authorities reporting no secondary cases and the situation stable. The cause of death remains unconfirmed, and key details are unanswered. Around 200 people in Irkutsk have been quarantined, though Russia told the WHO no plague cases were recorded there. Experts note stringent safety protocols make lab exposure unlikely, and testing for plague is straightforward and quick. Plague is endemic in parts of the world, but human transmission is generally poor. Experts call for transparency about the victim's work and cause of death, while the U.S. has offered assistance to Russia.