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Reversal Reactions in Lepromatous Leprosy Following Transfer Factor Therapy

Five patients with active leprosy, four with polar lepromatous (LL) and one with borderline lepromatous (BL) disease, were each treated with transfer factor (TF) from approximately 7.4 x 10⁹ lymphocytes given in 36 divided doses over a 12-week period. The TF was prepared from blood donated by normal, healthy, lepromin skin test-positive individuals. During treatment all four of the LL patients, but not the BL patient, developed clinical reversal reactions. Histopathologically, skin biopsies in these four LL patients showed evidence of transformation of collections of multibacillary macrophages into paucibacillary epithelioid cells and giant cells. To our knowledge, this is the first histopathologic documentation of reversal reactions occurring in polar LL. To the extent that reversal reactions are evidence of effective cell-mediated immunity to Mycobacterium leprae, these results indicate that TF is capable of at least partial correction of the immunologic deficit of lepromatous leprosy.

Accepted for publication December 14, 1977.

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