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.

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 vaccination rates in children are at their lowest level in six years, according to the CDC. In 2025, fewer than half of Americans have been vaccinated, the government agency said.

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.

Introduction. The 20th century witnessed three influenza pandemics: the Spanish Flu (1918, H1N1), Asian Flu (1957, H2N2) and the Hong Kong Flu (1968, H3N2).

The dominance of influenza A at this point in the flu season is to be expected. Influenza A is more commonly seen earlier in flu season, in the winter months, while influenza B seems to crop up ...

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(H5N1) viruses are an emerging zoonotic threat and have spread widely throughout birds in North America. Recently, influenza A(H5N1) infection led to serious illness in a teenager in ...