Supplies are being flown over occupied Oleshky – a lifeline for trapped civilians surviving on grass and weeds

Scant information provided by Russia means that a lab accident cannot be ruled out, say health experts

When the pathogen struck the City of Angels in 1924 authorities were quick to shut rumours down, much like the Russian response today

The death of a researcher following a laboratory accident in Russia has sparked concern. But how of much of a threat does it pose?

A broken test tube containing a plague sample is one thing. A test tube containing a weaponised virus is quite another

As the WHO demands answers from Russia, fears of a new pandemic are unfounded