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How long can influenza type B last?

Dr. David J. Ensz, MD
Family Practitioner

Influenza type B may last five days or longer.  Symptoms of the virus, such as coughing, throat irritation and congestion may last for days or weeks.

Most people are not contagious after about a week from the beginning symptoms. Many healthy adults may be able to infect other people beginning one day before their symptoms develop. Children may pass the virus for longer than seven days.

Trinity Health is a Catholic health care organization that acts in accordance with the Catholic tradition and does not condone or support all practices covered in this site. In case of emergency call 911. This site is educational and not a substitute for professional medical advice, always seek the advice of a qualified healthcare provider.

The first symptoms of influenza (flu) virus B, including fever, chills, headache and body aches, often begin to go away after about 2 or 3 days. In some cases, these symptoms will last 5 days or longer. The respiratory symptoms of influenza virus B, such as coughing, throat irritation and congestion may last for days or weeks. However, most people are not contagious after about a week from the beginning of symptoms.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.