Influenza vaccines are available every year beginning in the fall and throughout the winter season. The flu vaccine is adjusted each year based on expectations for the dominant flu strains at risk during the winter season.
The CDC recommends that everyone receive a flu vaccine annually from age 6months old and up with few exceptions. Certain populations are at higher risk of complications from the flu: infants/toddlers, the elderly, pregnant women, and patients with chronic medical conditions such as asthma, cystic fibrosis, diabetes, sickle cell disease, immune deficiencies, etc.).