Influenza, commonly referred to as the flu, is an infectious disease caused by RNA viruses of the family Orthomyxoviridae (the influenza viruses), that affects birds and mammals. The most common symptoms of the disease are chills, fever, sore throat, muscle pains, severe headache, coughing, weakness/fatigue and general discomfort. Although it is often confused with other influenza-like illnesses, especially the common cold, influenza is a more se...
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Also known as:
- Flu,
- Flu virus,
- Flu pandemic,
- Influenza pandemic,
- Influenza virus,
- The flu,
- Asian flu,
- California flu,
- Spanish flu,
- Spanish influenza
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