A Study on Reaction States in Leprosy

Abstract

Background: Leprosy, caused by Mycobacterium leprae, is a chronic infectious disease primarily affecting the skin and peripheral nerves. Reactional states in leprosy—Type 1 (reversal reaction) and Type 2 (erythema nodosum leprosum)—are acute immunological complications that significantly contribute to morbidity. Recognizing and managing these reactions promptly is essential to prevent nerve damage and disability.

Methods: This cross-sectional study included 100 diagnosed leprosy patients attending a tertiary care hospital’s dermatology outpatient department over two years. Clinical and histopathological data were collected to identify the type, frequency, and precipitating factors of leprosy reactions. Patients were classified according to the Ridley-Jopling classification.

Results: Among the 100 patients, 38% experienced lepra reactions. Type 1 reactions occurred in 21% and Type 2 in 17%. Borderline tuberculoid (BT) and borderline lepromatous (BL) patients were more prone to Type 1 and Type 2 reactions, respectively. Precipitating factors included initiation of multidrug therapy (MDT), stress, and infections. Steroids were the most commonly used drugs for managing both reaction types.

Conclusion: Reactional states are common in leprosy and can affect any stage of the disease. Early detection and management of reactions are crucial to minimize nerve damage and disability. Continued monitoring even after MDT completion is essential to manage delayed reactions.

Keywords: Leprosy, lepra reaction, reversal reaction, erythema nodosum leprosum, Type 1 reaction, Type 2 reaction.