Hypersensitivity to neomycin or after previous inj. Postpone vaccination in patients w/ acute severe febrile illness. Severe humoral or cellular immunodeficiency eg, patients w/ primary or acquired immunodeficiency states (total lymphocyte count <1,200/mm3
); lack of cellular immune competence eg, leukaemia, lymphoma, blood dyscrasias, clinically manifest HIV infection; receiving immunosuppressants. Avoid pregnancy after 1 mth of vaccination.