
Influenza, commonly known as "the flu," is a highly contagious viral infection of the respiratory tract. Immunization Schedule These groups, who are at increased risk of flu-related complications, should receive the flu shot every year: all children between 6 months and 18 years old, especially those 6 to 59 months oldany child or adult with chronic medical conditions, such as asthma, cystic fibrosis, diabetes, sickle cell anemia, and HIV/AID