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Influenza (Flu) | CDC
Flu is a contagious respiratory illness that infect the nose, throat, and sometimes the lungs. Learn about the current flu season and find resources related to flu surveillance and past seasons. Learn more about who is at higher risk of developing potentially serious flu complications.
Influenza - Wikipedia
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 humans but is not known to cause illness.
Influenza (flu) - Symptoms and causes - Mayo Clinic
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 the "stomach flu" viruses that cause diarrhea and vomiting. Most people with the flu get better on their own.
Flu (Influenza): Causes, Symptoms, Types & Treatment
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 be severe. Flu is most common in winter months, when many people can get sick at once (an epidemic).
About Influenza | Influenza (Flu) | CDC
Flu can cause mild to severe illness. Some people are at higher risk for more serious flu illness. Getting a flu vaccine has been shown to reduce the risk of flu and serious flu complications. Flu is a contagious respiratory illness caused by influenza viruses that infect tissues in the nose, throat, and sometimes the lungs.
Influenza (seasonal) - World Health Organization (WHO)
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 spreads easily between people when they cough or sneeze. Vaccination is the best way to prevent the disease.
Influenza | Definition, Symptoms, Treatment, & Prevention | Britannica
Influenza is an acute viral infection of the upper or lower respiratory tract, marked by fever, chills, and a generalized feeling of malaise. Seasonal influenza (the flu) is a major global health concern, causing annual epidemics with millions of severe cases and hundreds of thousands of deaths.
Flu (Influenza) - NFID
Influenza, commonly called flu, is a disease caused by a group of viruses that infect the nose, throat, and lungs. Many people have mild symptoms and recover in a few days to two weeks, but flu can be serious or even fatal. Even healthy children and adults can get very sick from flu.
Flu - NHS
Flu will often get better on its own, but it can make some people seriously ill. It's important to get the flu vaccine if you're advised to. Protect yourself from flu, have the flu vaccine (GOV.UK website, PDF only, 1.01MB) Flu symptoms come on very quickly and can include:
Influenza A virus - Wikipedia
Flu season is an annually recurring time period characterized by the prevalence of an outbreak of influenza, caused either by Influenza A or by Influenza B. The season occurs during the cold half of the year in temperate regions; November through February in the northern hemisphere and May to October in the southern hemisphere.
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