Appropriate medical treatment & supervision should always be readily available in case of anaphylactic reaction following vaccine administration. Postpone vaccination in case of moderate or severe febrile or acute disease. Not to be administered intravascularly. Patients w/ thrombocytopenia or bleeding disorder; bleeding may occur following IM administration. Syncope may occur following or before any vaccination; put procedures in place to prevent injury from fainting & manage syncopal reactions. May not protect all vaccinees. Possible insufficient Ab response in patients w/ endogenous or iatrogenic immunosuppression. Contains <1 mmol/dose K & Na. Not all infants <6 mth born to vaccinated women during pregnancy will be protected.