Andre patienter mangler antistoffer på grund af blodkræft (myelom eller kronisk lymfoid leukæmi), mens atter andre er børn, der har hyppige infektioner, fordi de er født med AIDS (erhvervet immundefektsyndrom).
It also includes patients whose lack of antibodies is due to a cancer of the blood (myeloma or chronic lymphoid leukaemia) or children born with acquired immune deficiency syndrome (AIDS), who suffer from frequent infections.