Persons who live with or provide care for infants aged younger than 6 months (eg. Parents, siblings, and daycare providers)

Health-care and emergency medical services personnel who have direct contact with patients or infectious material

Children aged 6 months to 24 years and

Persons aged 25-64 years who have chronic medical conditions that put them at higher risk for influenza-related complications. (Chronic medical conditions include chronic pulmonary (including asthma), cardiovascular (except hypertension), renal, hepatic, cognitive, neurologic/neuromuscular, hematologic, or metabolic disorders (including diabetes mellitus) or immunosuppression (including immunosuppression caused by medications or by human immunodeficiency virus).)