Influenza (flu) is a contagious respiratory disease caused by influenza viruses that infect the
respiratory tract (nose, throat, and lungs) in humans. The symptoms and complications of
flu are more severe than common cold. The symptoms associated with influenza may
include fever, headache, malaise, cough, sore throat, nasal congestion, and body aches.
Influenza vaccine can prevent illness and death caused by the influenza virus. Influenza
vaccine can be administrated to both young and old patien 更多
