Reactions to previous dose of vaccine or similar product; severe anaphylactic reaction following vaccination. Not to be inj into the blood vessel. Patients w/ blood (thrombocytopenia) or clotting disorders; immune deficiency. Concomitant use w/ corticosteroids, cytotoxic drugs, RT, or any other treatments likely to weaken immune defenses. Observe patients for at least 30 min on site after inj. Pregnancy.