Table 1. Groups for whom influenza vaccination is particularly recommended.

People at high risk of influenza-related complications or hospitalization All pregnant womena Adults and children with the following chronic health conditions: cardiac or pulmonary disorders (including bronchopulmonary dysplasia, cystic fibrosis and asthma) diabetes mellitus and other metabolic diseases cancer, immune compromising conditions (due to underlying disease, therapy or both) renal disease anemia or hemoglobinopathy neurologic or neurodevelopment conditionsb morbid obesity (body mass index [BMI] of 40 and over) children and adolescents (age six months to 18 years) undergoing treatment for long periods with acetylsalicylic acid, because of the potential increase of Reye syndrome associated with influenza People of any age who are residents of nursing homes and other chronic care facilities People 65 years of age and older All children 6–59 months of age Indigenous peoples People capable of transmitting influenza to those at high risk Health care and other care providers in facilities and community settings who, through their activities, are capable of transmitting influenza to those at high risk of influenza complications Household contacts (adults and children) of individuals at high risk of influenza-related complications (whether or not the individual at high risk has been immunized): household contacts of individuals at high risk, as listed in the section above household contacts of infants under 6 months of age as these infants are at high risk of complications from influenza but cannot receive influenza vaccine members of a household expecting a newborn during the influenza season Those providing regular child care to children 59 months of age and under, whether in or out of the home Those who provide services within closed or relatively closed settings to persons at high risk (e.g., crew on a ship) Others People who provide essential community services People in direct contact during culling operations with poultry infected with avian influenza

^a The risk of influenza-related hospitalization increases with length of gestation (i.e., it is higher in the third than in the second trimester)

^b These neurologic or neurodevelopmental conditions include neuromuscular, neurovascular, neurodegenerative, neurodevelopmental conditions and seizure disorders (and for children, include febrile seizures and isolated developmental delay), but exclude migraines and psychiatric conditions without neurological conditions