At the surface, the immune response to a flu virus is simple. Some cells recognize the pathogen and send a signal to the immune system, and immune cells produce a potentially lifesaving antibody ...

The flu virus is changing in ways never seen before, increasing infections and raising concerns about vaccine effectiveness and public health risks.

Influenza A is believed to be the most severe type of flu virus for humans, although this is the subject of debate, as there is some evidence to suggest that influenza B might be equally as dangerous.

What to Know About the Flu Virus What’s the difference between influenza A and influenza B, and does it matter which you catch? Share full article 235 Keith Negley ...

As the Centers for Disease Control and Prevention (CDC) explains, bird flu is a disease caused by the influenza A virus. At the same time, recent CDC data shows that seasonal influenza A is rising ...

Although the avian flu (H5N1) virus may not be making the news as frequently, it is still working hard behind the scenes, ...

Two types of influenza viruses are responsible for seasonal flu outbreaks: Influenza A and B. Influenza A accounts for around 75 percent of all cases and tends to cause more severe illness in adults.

New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Experts have been studying influenza for many years now, but there are some ways this virus can still surprise us. What's the difference between flu A and B?

Influenza, commonly called "the flu," is caused by viruses that infect the respiratory tract. Compared with most other respiratory infections, such as the common cold, the flu often causes a more ...

The flu is a contagious viral infection of the respiratory system that affects the nose, throat and lungs. It is caused by influenza viruses. Symptoms of mild flu infections can resemble those of ...

CLEVELAND, Ohio — Influenza A — a nasty virus that fueled the 2009 flu epidemic — is landing increasing numbers of Ohioans in the hospital. In Cuyahoga County, influenza A, one of four types ...