Box | Individuals at high risk for complications from influenza.  Children younger than 5 years old (especially children younger than 2 years old)  Pregnant women or women who are planning on becoming pregnant during the influenza season  Persons with chronic medical conditions (i.e. chronic pulmonary, cardiovascular, renal, hepatic, cognitive, neurologic, hematologic or metabolic diseases)  Immunocompromised individuals  American Indians/Alaska Natives  Individuals with a body mass

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... index of 40 or greater  Residents of nursing homes or chronic care facilities  Similar between groups HAI = hemagluttination inhibition antibody.