Influenza is a contagious disease caused by influenza viruses that infect the respiratory tract (nose, throat, and lungs). It can cause mild to severe illness, sometimes leading to death. Influenza symptoms often begin suddenly, with fever, headache, tiredness, dry cough, sore throat, nasal congestion, and body aches. The best way to prevent influenza is to get vaccinated each year.
Weekly Influenza Report
Influenza A H3N2 variant viruses (H3N2v) (PDF, 43 KB)