What are the subtypes of influenza A?

What are the subtypes of influenza A?

Influenza A virus has the following subtypes:

• Influenza A virus subtype H1N1.
• Influenza A virus subtype H1N2.
• Influenza A virus subtype H2N2.
• Influenza A virus subtype H2N3.
• Influenza A virus subtype H3N1.
• Influenza A virus subtype H3N2.
• Influenza A virus subtype H3N8.
• Influenza A virus subtype H5N1.

How many variants of influenza A are there?

Influenza A viruses are classified by subtypes based on the properties of their hemagglutinin (H or HA) and neuraminidase (N or NA) surface proteins. There are 18 different HA subtypes and 11 different NA subtypes. Subtypes are named by combining the H and N numbers – e.g., A(H1N1), A(H3N2).

What is the difference between a type of influenza and a subtype of influenza?

Influenza A is the most common type. H1N1 flu is a subtype of influenza A. Subtypes of influenza A are categorized based on two proteins on the surface of the virus, hemagglutinin (H) and neuraminidase (N). There are many H and N subtypes, and each one is numbered.

What are the 3 influenza subtypes?

There are three kinds of influenza: A, B, and C. Influenza B and C aren’t much to worry about, at most causing minor illness. The influenza A viruses, by contrast, are highly variable and so have the potential to outwit the human immune system and cause a pandemic.

What does flu type A mean?

Key facts. Influenza A is a type of virus that causes the flu. Most people who have flu are infected with the influenza type A virus. Symptoms of Influenza A include fever and chills, sneezing, coughing and a sore throat. As well as infecting people, the influenza A virus can infect animals, including birds and pigs.

Is influenza A serious illness?

If you’re young and healthy, the flu usually isn’t serious. Although you may feel miserable while you have it, the flu usually goes away in a week or two with no lasting effects. But children and adults at high risk may develop complications that may include: Pneumonia.