Histological changes in tuberculoid leprosy after fixed duration multidrug therapy for six months.

The length of treatment advocated for leprosy has been very long and arbitrary. During the past few years, attempts have been made to reduce the length of treatment required. World Health Organization (WHO) has recommended six months therapy for paucibacillary leprosy. The present study was undertaken to see the extent of histological changes that occur with this therapy. Thirty four untreated tuberculoid (TT/BT) leprosy patients were biopsied initially and after completion of fixed course of this treatment. Clinically, 50 percent of the patients showed regression of disease activity at the end of six months. Morphology of the lesions was studied, in clinically active and inactive cases on completion of therapy. It was found that after six month's therapy, histology of the lesions was similar, whether the case was active or not. After the prescribed treatment, biopsy showed marked reduction in the extent of granuloma, along with significant increase in lymphocytes and a increase in epithelioid cells in these granulomas.