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Serial Mitsuda tests for identification of reactional tuberculoid and reactional borderline leprosy forms
L C Lastoria1, D V Opromolla, R N Fleury
1Department of Dermatology and Radiotherapy, Botucatu Medical School, UNESP, Brazil.
Summary
The Mitsuda reaction effectively differentiates between reactional tuberculoid and borderline leprosy. Reactional tuberculoid leprosy patients show stronger Mitsuda reactions and fewer bacilli compared to borderline cases.
Area of Science:
- Dermatology
- Infectious Diseases
- Immunology
Background:
- Leprosy presents diverse clinical and immunological manifestations.
- Differentiating leprosy subtypes is crucial for effective treatment and management.
- The Mitsuda reaction is an established immunological test in leprosy.
Purpose of the Study:
- To evaluate the diagnostic utility of the Mitsuda reaction in distinguishing between reactional tuberculoid and reactional borderline leprosy.
- To correlate Mitsuda reaction results with clinical, histopathological, and bacilloscopic findings.
Main Methods:
- The Mitsuda reaction was assessed in 37 leprosy patients (18 reactional tuberculoid, 19 reactional borderline).
- Evaluations were performed at 30, 60, 90, and 120 days post-reaction.
- Results were compared with clinical presentation, histopathology, and bacilloscopy.
Main Results:
- Reactional tuberculoid patients predominantly exhibited a +3 Mitsuda reaction.
- Reactional borderline patients showed a weaker Mitsuda reaction (+).
- Bacilli were rare or absent in 75% of reactional tuberculoid cases, versus present in 95% of reactional borderline cases.
Conclusions:
- The Mitsuda reaction is a valuable tool for differentiating reactional tuberculoid from reactional borderline leprosy.
- Reactional tuberculoid leprosy patients demonstrate a superior capacity for bacillary clearance.
- Immunological response, as indicated by the Mitsuda reaction, correlates with bacterial load in leprosy.