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. 1989 Oct;86(20):8073–8077. doi: 10.1073/pnas.86.20.8073

Effect of multiple interferon gamma injections on the disposal of Mycobacterium leprae.

G Kaplan 1, N K Mathur 1, C K Job 1, I Nath 1, Z A Cohn 1
PMCID: PMC298217  PMID: 2510159

Abstract

The effect of multiple intradermal injections (four to six) of 10 micrograms of interferon gamma on the number of Mycobacterium leprae in the skin of patients with polar lepromatous leprosy and borderline lepromatous leprosy was evaluated. To achieve a maximum zone of induration and cell emigration a preparatory dose of the lymphokine was required. A second group of three injections, given 3-4 days after the initial series, resulted in lesser degrees of induration and was more in keeping with a partial local hyporesponsive state. A marked emigration of T cells and monocytes into the dermis resulted from injections of interferon gamma and persisted for greater than 21 days. A preponderance of CD4+ cells in the infiltrate was seen within a few days and CD4/CD8 ratios remained elevated for greater than 5 weeks. The bacillary load of injected sites evaluated 21 days after lymphokine administration was reduced in 14/17 patients by factors ranging from 5- to 1000-fold. This occurred predominantly within diffuse lesions and occurred rarely in nodular sites. Biopsy samples of injected sites taken 6 months later demonstrated progressive 10-fold reductions in bacilli and the continued presence of a granulomatous response.

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Selected References

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