Scientists are still trying to figure out a how highly-transmissible variant of the coronavirus currently spreading through a growing number of countries came to be. But they suspect a single COVID-19 ...

The CDC said that testing of a person with a severe case of bird flu indicated the virus had mutated but the risk remains low to the public as no human-to-human transmission has been documented.

Rats fuelled the largest outbreak of deadly Lassa fever in Nigeria this year, according to the most extensive and rapid genomic analysis of the Lassa virus conducted thus far. The study 1, published ...