Russia ends quarantine after mystery lab death: nearly 5,000 tests done, but what killed the worker?

Russia has lifted quarantine measures in Siberia’s Irkutsk region, just one week after a laboratory worker died under mysterious circumstances. Authorities say nearly 5,000 tests detected no dangerous pathogens, and medical monitoring of the deceased worker’s contacts has ended. However, questions remain about what caused the 28-year-old technician’s death at the Anti-Plague Institute of Eastern Siberia and the Far East....