Precautions with the MMR vaccine include Moderate or severe acute illness with or without fever (vaccination is postponed until illness resolves) Recent (within 11 months) treatment with blood products that contain antibody (specific interval depends on the product) History of thrombocytopenia or thrombocytopenic purpura If a person is infected with Mycobacterium tuberculosis, MMR vaccine and possibly MMRV vaccine may temporarily suppress the response to tuberculin testing.