Russia quarantined a hospital after a Siberian plague institute employee died with unknown pneumonia. The case has stirred plague fears, though officials say tests found no linked pathogen.

Russian authorities have quarantined a hospital and are monitoring contacts of an employee at a plague research institute in Siberia who contracted pneumonia of an "unknown" cause. Local sta

Woman in Irkutsk dies of plague; hundreds quarantined amid reports of possible pneumonic infection and outbreak concerns.

Russian authorities say a staffer at a plague research institute in Siberia contracted pneumonia of an unknown cause, and local state TV reported the woman died last week.