Influenza — commonly known as the flu — is a respiratory infection caused by flu viruses. There are three main types of influenza: A, B, and C. Types A and B are similar, but influenza B can only pass from human to human.
The Centers for Disease Control and PreventionTrusted Source reports both types A and B can be equally severe, challenging a previous misconception that type B tends to be a milder disease.
A common indicator of the influenza virus is a fever, often more than 100ºF (37.8ºC). It is highly contagious and in more serious cases can cause life-threatening complications. Learn other symptoms that could indicate a type B influenza infection.
There are three main types of influenza:
- Type A. The most common form of influenza, type A can spread from animals to humans and is known to cause pandemics.
- Type B. Similar to type A, influenza B is also highly contagious and can have dangerous effects on your health in more severe cases. However, this form can only be spread from human to human. Type B influenza can cause seasonal outbreaks and can be transferred throughout the year.
- Type C. This type is the mildest version of the flu. If infected with type C influenza, your symptoms will not be as damaging.
Early detection of an influenza infection can prevent the virus from worsening and help you find the best course of treatment. Common symptoms of type B influenza include:
Similar to a common cold, influenza B can cause you to experience respiratory symptoms. Onset symptoms may include:
A common signal of the flu is a fever that could reach as high as 106ºF (41.1ºC). If your fever does not subside within a few days, seek immediate medical attention.
In addition, you may also experience symptoms including:
In rare cases, the flu may cause diarrhea or stomach pains. These symptoms are more common in children. It can be mistaken for a stomach bug since children infected with type B influenza may experience:
- abdominal pain
- loss of appetite
Journal of Infectious Diseases and Diagnosis