A Russian researcher, who died from an unknown illness, worked at a remote anti-plague facility. Few foreigners have visited these labs, which dot the former Soviet states, and are shrouded in secrecy.
New information around the death of a lab worker, including a statement that she had been vaccinated against the plague, came as U.S. officials demanded more data.
The entrance to the grounds of the anti-plague institute in Irkutsk, Russia, on Wednesday. An employee of the institute died of a mysterious pneumonia.
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