Hypersensitivity including gelatin. Anaphylactic or anaphylactoid reactions to neomycin. Febrile resp illness or other active febrile infection. Active untreated TB. Patients receiving immunosuppressive therapy. Blood dyscrasias, leukemia, lymphomas of any type, or other malignant neoplasms affecting the bone marrow or lymphatic systems. Primary & acquired immunodeficiency states including patients who are immunosuppressed in association w/ AIDS or other clinical manifestations of infection w/ HIV; cellular immune deficiencies; hypo- & dysgammaglobulinemic states. Measles inclusion body encephalitis, pneumonitis & death as direct consequence of disseminated measles vaccine virus infection has been reported in severely immunocompromised individuals inadvertently vaccinated w/ measles-containing vaccine. Family history of congenital or hereditary immunodeficiency until immune competence of potential vaccine recipient is demonstrated. Pregnancy. Avoid pregnancy for 1 mth following vaccination.