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With Virus Origins Still Obscure, W.H.O. and Critics Look to Next Steps

Virus Variants Can Infect Mice, Scientists Report

A W.H.O. Researcher on His Trip to China Seeking Origins of the Virus

Study Suggests Coronavirus Emerged Much Earlier Than Thought. Some Are Skeptical.

You’re Swabbing a Dead Gorilla for Ebola. Then It Gets Worse.

Bats, Not Dogs, Are the Most Common Source of Rabies

An Experimental Ebola Cure May Also Protect Against Nipah Virus

Deadly Ebola Virus Is Found in Liberian Bat, Researchers Say

Marburg Virus, Related to Ebola, Is Found in Bats in West Africa