Mystery surrounds young worker's death at Russia lab studying severe diseases

The World Health Organization is currently investigating the death of a young worker at a Russian laboratory specializing in the study of plague and other severe diseases. As of Saturday, the agency has stated that the specific cause of death remains unknown and is subject to ongoing inquiry.

While the cause has not been officially confirmed, the U.N. health agency has acknowledged initial, unconfirmed reports suggesting the worker may have contracted pneumonic plague. The situation remains under review as international health officials seek to clarify the circumstances surrounding the incident.