Influenza is a common respiratory virus that is categorized into four types: A, B, C and D. Type C only causes mild infections and type D is not believed to infect humans.

Influenza levels in the United States are the highest they've been in 15 years as winter weather persists and the second wave of the virus causes more and more infections, according to the Centers ...

According to recent data from WastewaterScan, a Stanford-run program that tracks viral traces in local wastewater, levels of influenza B - a virus that causes similar symptoms as the flu - were ...

This is the worst flu season in 15 years. Here's why—and how to protect yourself. The number of influenza cases is surging across the United States, putting significant strain on many hospitals.

Virus that causes polio-like illness found in Bay Area as influenza cases spike First identified in California in 1962, EV-D68 can severely impact small children By Ariana Bindman , News Features ...

Influenza epidemics, caused by influenza A or B viruses, result in acute respiratory infection. They kill half a million people worldwide every year. These viruses can also wreak havoc on animals ...

Avian influenza viruses typically require several mutations to adapt and spread among humans, but what happens when just one change can increase the risk of becoming a pandemic virus? A recent ...