Influenza Influenza Influenza or flu is a viral illness that most often occurs in epidemics in the cold months causing widespread infection and medical complications in all age groups.
Symptoms vary depending on the strain of flu.
Symptoms include fever, general body aches, headache weakness, sore throat, cough, vomiting, and diarrhea. You may have one or more symptoms. The infection rates and medical complications are greatest among children and the elderly. Also, children are largely responsible for the spread of flu in the family and community. We believe that immunization of preschool and school children against the flu can stop or decrease the spread of flu in the community.