Russia Plague Scare Lab Worker Dead, 200 Under Watch

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A worker at a Russian anti-plague lab is dead after coming down with a mystery case of pneumonia ... and the fallout has nearly 200 people under medical watch.

The 28-year-old woman worked at the Irkutsk Anti-Plague Institute of Siberia and the Far East, and Russian officials say she died last week from pneumonia of an undetermined origin.

The situation got serious enough that the hospital facility where she was treated was quarantined ... while Russian media reported nearly 200 people who had contact with her were placed under precautionary observation.