The non-HIV factors implicated were, childhood malignancies (n = 207), such as leukemias and lymphomas as well as their treatment, lung diseases (n = 7), environmental exposures and toxins (n = 224), autoimmune diseases (n = 12), organ transplants (n = 12), long-term steroid therapy (n = 3), the use of immunosuppressive drugs such as TNF-alpha inhibitors (n = 7) malnutrition (n = 12), histiocytosis (n = 3), hyperimmunoglobulin M and E syndromes (n = 15, 1.2%), pancytopaenias (n = 26), diabetes mellitus (n = 1) and T-cell deficiency (n = 21). Here, TNF is linked to Histiocytosis.