Flu is caused by the influenza virus. There are three types of influenza virus - A, B and C. Influenza A and B cause most cases of flu.
Each winter a different type of influenza virus causes an outbreak of flu which affects many people. This is called seasonal flu. If you get a flu-like illness during an outbreak of seasonal flu, it is likely to be caused by the prevailing influenza virus. Most cases of flu usually occur in a period of six to eight weeks during the winter.
We prescribe Tamiflu which is only effective if started within the first 48 hours of symptoms. It can also be prescribed for flu prevention.
Tamiflu is not a substitute for the flu jab.
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