What is Influenza?

The flu is a highly contagious viral illness that tends to occur in epidemics during the winter. It is spread by the coughs and sneezes of infected people and also by direct contact with contaminated articles such as handkerchiefs.

About 24–48 hours after exposure, you develop a sudden fever, shivering, headache, dry cough, muscle aches, exhaustion, and sore eyes and throat. Although you will begin to feel better after 4–5 days, you may feel tired and continue coughing for several weeks.