Influenza is a common viral respiratory infection. It is contagious with an incubation period of 24 to 48 hours after exposure. There are three main types of influenza (A, B, C). Only type A produces widespread outbreaks. This is due to the fact that the virus has the ability to constantly change, producing new strains every few years. Since the virus has changed, there is no longer any immunity, and everyone is a potential target for the disease. Several different outbreaks occur every winter. The severity of the illness varies. Both sexes and all ages except infants are affected.
Causes of Influenza
Influenza is in the class of myxovirus. It is spread by personal contact or indirect contact (use of a contaminated drinking glass).
Signs and Symptoms of Influenza
Symptoms of influenza include fever and chills. Muscle pains and muscle aches occur. Most people complain of quite severe fatigue and generalized weakness. Sore throat, cough (which usually does not produce any sputum), runny nose and hoarseness appear. There may be headache and backache. If a secondary bacterial infection develops in the lungs, there may be a productive cough, with large amounts of sputum. The fever may be higher and there may be difficulty breathing.
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Medical Content Last Updated on 07/12/2008
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