Type A influenza subtype H9: Influenza is viral respiratory infection. The virus is very contagious and can cause severe illness especially in patients who are very young or old or have some other medical condition as well. The severity of symptoms can vary but usually involves respiratory and constitutional (e.g. headache, aching muscles) symptoms. The influenza virus can mutate and produce different strains though the symptoms are the same. This frequent mutation means that people need regular vaccinations to ensure they are protected against new strains as they arise. Influenza A H9 is a subtype of influenza which rarely causes infection in humans and tends to only cause mild illness. More detailed information about the symptoms, causes, and treatments of Type A influenza subtype H9 is available below.
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Types of Type A influenza subtype H9
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