how does influenza spread?
The flu (influenza) is a contagious respiratory disease caused by flu viruses. It is spread from person to person by coughing or sneezing. It can also be spread by touching contaminated surfaces. Symptoms of flu include fever* or feeling feverish/chills, cough, sore throat, runny or stuffy nose, muscle or body aches, headache, and tiredness. Nausea, vomiting, and diarrhea also can occur but are more common in children than adults.