THE SICK AND ELDERLY ARE MOST AT RISK.
Symptoms include headache, fever, cough, sore throat, aching muscles and joints.
Influenza occurs most often in winter and usually peaks, between December and March in the northern hemisphere.
For most people, influenza infection is just a nasty experience but, for some, it can lead to more serious illnesses.
The most common complications of influenza are bronchitis and secondary bacterial pneumonia. These illnesses may require treatment in hospital and can be life threatening, specially in the elderly, asthmatics and those in poor health.