Influenza A is a type of influenza virus that causes the flu. It is one of the most common causes of respiratory illness in the world.
Influenza A viruses are classified into subtypes based on two proteins on their surface: hemagglutinin (H) and neuraminidase (N). There are 18 different H subtypes and 11 different N subtypes.
Influenza A viruses can infect both humans and animals. The most common subtypes that infect humans are H1N1 and H3N2. These subtypes are responsible for the seasonal flu epidemics that occur each year.
Influenza A viruses can also cause pandemics, which are global outbreaks of a new strain of the virus. The most recent pandemic was caused by the H1N1 virus in 2009.
Influenza A viruses are spread through respiratory droplets when an infected person coughs, sneezes, or talks. The virus can also be spread by touching something that has been contaminated with the virus and then touching your face.
Symptoms of influenza A include fever, chills, muscle aches, headache, runny nose, sore throat, and cough. The symptoms can range from mild to severe.
Treatment for influenza A includes rest, fluids, and over-the-counter pain relievers. In some cases, antiviral medications may be prescribed.
Prevention of influenza A includes getting vaccinated each year, washing your hands frequently, and avoiding close contact with people who are sick.
Influenza A is a serious respiratory illness that can cause significant morbidity and mortality. Vaccination is the best way to prevent influenza A infection.
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