Influenza A virus and influenza B virus circulate in humans and cause seasonal epidemics, and influenza C virus causes a mild infection, primarily in children. Influenza D virus can infect …

Influenza (flu) is a contagious respiratory illness caused by influenza viruses that infect the nose, throat, and lungs. Learn about flu, including symptoms, prevention methods, and treatment …

Dec 19, 2025 · Flu, also called influenza, is an infection of the nose, throat and lungs, which are part of the respiratory system. The flu is caused by a virus. Influenza viruses are different from …

Feb 28, 2025 · Seasonal influenza (the flu) is an acute respiratory infection caused by influenza viruses. It is common in all parts of the world. Most people recover without treatment. Influenza …

What is the flu (influenza)? The flu is an illness you get from the influenza virus. It causes symptoms like head and body aches, sore throat, fever and respiratory symptoms, which can …

1 day ago · The new variant of Influenza A, or H3N2, has been given the nickname 'super flu.' The fast-spreading virus has caused hospitalizations to nearly double in a week, the CDC reported.

Sep 16, 2025 · Influenza, commonly known as the flu, is a contagious viral respiratory infection. Symptoms, like a fever, body aches, and sore throat, typically go away on their own within one …

2 days ago · Flu season is off to a rough start this year, according to new CDC data. The virus is spreading faster than in previous years and the surge is likely to get worse. Here's what you …

Dec 24, 2025 · Influenza is caused by viruses in the family Orthomyxoviridae. Learn more about the classification of influenza viruses, influenza outbreaks, and influenza symptoms and …

Feb 28, 2024 · The flu, also called influenza, is a respiratory infection caused by viruses. Each year, millions of Americans get sick with the flu. Sometimes it causes mild illness. But it can …