Influenza A and B are the most common types of flu in humans. Here, learn about the differences between influenza A and B, including symptoms and treatments.

All four flu pandemics — in 1918, 1957 and 1968 and the swine flu pandemic of 2009 — were caused by Type A viruses. Influenza B viruses, however, only circulate in humans.

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 ...

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.

What’s the difference between flu A vs. flu B? The two most common and most severe flu strains are type A and type B, according to the CDC.Of the data collected so far this season, 96.6% of flu ...

(NEXSTAR) – The flu is spreading far and wide across the U.S. – and influenza A is largely to blame. Of all the flu tests reported to the Centers for Disease Control and Prevention since the ...

What is influenza A, the type of flu making people so sick right now? by: Alix Martichoux, The Hill. Posted: Feb 7, 2025 / 04:02 PM MST. Updated: Feb 7, 2025 / 04:02 PM MST.

Influenza virus is an infectious agent belonging to the virus family Orthomyxoviridae that causes a respiratory tract infection (influenza or 'flu') in vertebrates. There are three main species ...

Influenza activity is elevated across most of the country, with at least 5.3 million illnesses, 63,000 hospitalizations, and 2,700 deaths from flu so far this season, according to the CDC.

Influenza A virus particles strategically adapt their shape -- to become either spheres or larger filaments -- to favor their ability to infect cells depending on environmental conditions ...