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.
As Dr. Anthony Fauci has faced public scrutiny from congressional Republicans, the D.O.J. has pursued a quieter and more expansive effort against a wider circle of researchers.
Even the most adept researchers may not know exactly what they do to get successful results. An A.I. model is trying to figure it out by watching every move.
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