Do not administer IV. Postpone administration in patients w/ acute severe febrile illness. Temp ≥40°C; collapse or shock-like state; persistent, inconsolable crying lasting ≥3 hr, occurring w/in 48 hr of vaccination or convulsions w/ or w/o fever, occurring w/in 3 days of vaccination. Progressive neurological disorders including infantile spasms, uncontrolled epilepsy or progressive encephalopathy. Thrombocytopenia or bleeding disorders. Immunosuppressed patients. Syncope (fainting) may occur. A protective immune response may not be elicited in all vaccinees. Can be used between 27 & 36 wk of pregnancy. Lactation.