Related Experiment Video
Updated: Jun 28, 2026

Optimized Protocols for Mycobacterium leprae Strain Management: Frozen Stock Preservation and Maintenance in Athymic Nude Mice
Published on: March 23, 2014
Long-term disability outcomes in Hansen's disease: A 20-year comparative study of Lepromatous vs. Tuberculoid Leprosy
Elaine J Ma1, Brandon L Adler2, April W Armstrong3
1University of Southern California Keck School of Medicine, Los Angeles, California, United States of America.
Background:
Leprosy remains an important cause of disability, even in non-endemic settings. Risk of neuropathy and functional impairment differs across the disease spectrum, yet contemporary U.S. data are limited.
Objective:
To compare disability-related outcomes among patients with lepromatous versus tuberculoid leprosy in a large U.S. electronic health record (EHR) network.
Methods:
Using the TriNetX U.S. Collaborative Research Network (2005-2025), patients with lepromatous (ICD-10-CM A30.4-A30.5) and tuberculoid (A30.1-A30.2) leprosy were identified. Disability-related outcomes were defined using ICD-10-CM and CPT codes. Patients with prior disability were excluded to assess incident events. Cohorts were propensity score-matched (1:1) on demographics and comorbidities. Odds ratios (OR) and hazard ratios (HR) with 95% confidence intervals (CI) were calculated.
Results:
A total of 341 lepromatous and 129 tuberculoid patients were identified (median follow-up 1,138 vs 1,021 days). Lepromatous leprosy was associated with higher risk of incident disability-related outcomes (OR 1.89, 95% CI 1.16-3.07). Kaplan-Meier analysis demonstrated lower outcome-free survival in the lepromatous cohort (HR 1.76, 95% CI 1.15-2.71).
Conclusions:
In this U.S.-based cohort, lepromatous leprosy was associated with greater disability-related morbidity compared to tuberculoid leprosy. However, meaningful risk was observed across both subtypes, supporting structured longitudinal follow-up for all patients.
Related Concept Videos
Pulmonary Tuberculosis II
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
Pulmonary Tuberculosis III
The first classification is based on the development of the disease, and it includes the following categories:
Pulmonary Tuberculosis I
Causative Organism
The primary infectious agent causing tuberculosis is Mycobacterium tuberculosis, a slow-growing, acid-fast, aerobic rod that exhibits sensitivity to heat and ultraviolet light. Instances of Mycobacterium bovis and Mycobacterium avium contributing to the development of TB infection are rare.
Mode of...
Pulmonary Tuberculosis V
Latent tuberculosis infection occurs when TB bacteria are present in a person's body, but are not causing illness or symptoms. It is not contagious, and preventive treatment is crucial to avoid the progression...
Pulmonary Tuberculosis IV
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
Classification of Illness
An illness is a response to a disease in which the person's level of functioning is changed compared with a previous level. The general classification of illness includes acute and chronic.
Acute illness is severe and...