Do not inj intravascularly. Do not mix w/ other vaccines in the same syringe. Caution in case of an anaphylactic event following administration. Postpone vaccination in patients w/ acute febrile illness until fever is resolved. Ab response in patients w/ endogenous or iatrogenic immunosuppression may be insufficient to prevent flu. Administer w/ caution to individuals w/ thrombocytopaenia or bleeding disorder. Syncope can occur as psychogenic response to needle inj. May not protect all vaccinees. Assess risks & benefits before administering to a pregnant or breast-feeding woman. Safety & efficacy have not yet been established in individuals <18 yr.