The difference between a virus and a worm is not semantic. A virus waits for a user to trigger it; a worm exploits ...

Hikers along Southern California's Pacific Crest Trail have been smacked with fast-spreading cases of a "winter vomiting disease" – and they aren't the only ones. At least two dozen hikers have fallen ...

Add Yahoo as a preferred source to see more of our stories on Google. Southbound hikers walk toward Pinchot Pass on the Pacific Crest Trail in California. (David Madison / Getty Images file) (David ...

Flu season may be mostly behind us, but a nasty, highly contagious stomach bug is rising. Limited time: Save 25% on NBC News subscription Get exclusive reporting, live Q&As and ad-free reading. In ...

Global health officials are tracking an outbreak of Ebola caused by a rare species of orthoebolavirus called the Bundibugyo virus that has so far killed more than 130 people and infected more than 500 ...

Here’s what to know about the symptoms and spread of the virus, which has sickened people in the Democratic Republic of Congo and Uganda. By Dani Blum Global health officials are raising alarms about ...

A highly contagious illness that can cause severe and even deadly vomiting and diarrhea is spreading at an alarmingly high rate across the United States, health experts warned. Rotavirus, known for ...

Some lovers try positions that they can’t handle – I’m referring to the bones of the wrist, of course. The phrase is a classic mnemonic used to remember the eight carpal (wrist) bones – scaphoid, ...

A new University of California San Diego study published in Cell challenges a long-standing assumption about how animal viruses become capable of sparking human epidemics and pandemics. Using a ...

If you notice that your office is emptying out, chances are it’s because a respiratory virus that few people have actually heard of is circulating throughout Northern California. Dr. Monica Gandhi, an ...

Viruses rely on the machinery of their host cells to produce proteins, but some giant viruses encode a key part of this toolkit in their genome, enabling them to direct the host cell to produce more ...

Two emerging pathogens with animal origins—influenza D virus and canine coronavirus—have so far been quietly flying under the radar, but researchers warn conditions are ripe for the viruses to spread ...