Influenza B, also known as the flu, is a contagious viral infection affecting the throat, nose and lungs, says MedlinePlus.
Symptoms
The Mayo Clinic says that symptoms of the flu include a fever of 101 degrees Fahrenheit or greater, nasal congestion, fatigue, weakness, a headache, chills and sweats.
Timing
MedlinePlus indicates that influenza B can appear at any time, regardless of the climate.
Risk Factors
The Mayo Clinic indicates that risk factors for catching the flu include being over age 50 and residing in a nursing home. Other risk factors include suffering from a chronic disorder like diabetes or heart disease and having a weakened immune system.
Treament
Treatment for influenza B includes rest, drinking plenty of fluids and taking medications to relieve your symptoms. For example, you can take over-the-counter aspirin to lower your fever.
Complications
The Mayo Clinic indicates that untreated influenza B can lead to ear infections, pneumonia, bronchitis, sinus infections or encephalitis (a brain infection).
