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. Russian authorities have quarantined a hospital and are monitoring contacts of an employee at a plague research institute in Siberia Key points and original sources are listed below.

• 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 state TV said the woman died last week.S1

• Russian authorities have quarantined a hospital and are monitoring contacts of an employee at a plague research institute in SiberiaS2

• 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 weekS3