At the viral chatter stage of an outbreak, pathogens are just starting to infect people in sporadic bursts. It's a sign that ...

A 3-year-old girl from the western state of Durango is Mexico’s first confirmed human case of bird flu, health officials said Friday. Type A H5N1 influenza has been ...

In a growing global trend, bacteria are evolving new ways to maneuver around medical treatments for a variety of infections.