is influenza a contagious
The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. Some people, such as older people, young children, and people with certain health conditions, are at high risk for serious flu complications. The flu is worse than the common cold, and symptoms such as fever, body aches, extreme tiredness and dry cough are more common and intense. 2  People with colds are more likely to have a runny or stuffy nose.