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Histo-bacteriological investigation on borderline tuberculoid leprosy
Nihon Rai Gakkai Zasshi
|July 1, 1991
Summary
Active borderline tuberculoid (BT) leprosy cases show Mycobacterium leprae bacilli in nerves and muscles. This suggests multibacillary treatment is crucial for all active BT cases, even smear-negative ones, to prevent relapse.
Area of Science:
- Microbiology
- Dermatology
- Pathology
Background:
- Borderline tuberculoid (BT) leprosy is a form of leprosy characterized by a variable immune response.
- Understanding Mycobacterium leprae (M. leprae) localization is key to effective treatment and preventing relapse.
Purpose of the Study:
- To investigate the presence and location of M. leprae bacilli in skin biopsies of active BT leprosy cases.
- To correlate bacillary presence with clinical presentation and inform treatment recommendations.
Main Methods:
- Skin biopsies from twelve active BT leprosy patients were analyzed using Fite staining.
- Special stains were employed to identify nerve components and bacilli.
Main Results:
- All twelve cases were acid-fast bacilli (AFB) positive.
- Bacilli were detected in infiltrated nerves in 11 cases (92%).
- Bacilli were found within nerve fragments in epithelioid cell granulomas in 7 cases (58%) and in arrector pili muscles in 2 cases (17%).
Conclusions:
- The high prevalence of bacilli in nerves of active BT cases underscores their importance in disease pathogenesis.
- Persistent M. leprae in nerves may contribute to treatment failure and relapse.
- Multibacillary (MB) treatment regimens are recommended for all active BT cases, including smear-negative individuals, to ensure bacterial clearance and prevent relapse.