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Two sisters with leprosy
N Ishii1, Y Sugita, H Nakajima
1Department of Dermatology, Yokohama City University School of Medicine, Japan.
The Journal of Dermatology
|April 1, 1993
Summary
Two sisters with leprosy, diagnosed with different types (BB and TT), were identified in Japan. Despite undetectable bacilli in biopsies, Mycobacterium leprae DNA was detected in their blood and tissue samples.
Area of Science:
- Immunology
- Infectious Diseases
- Genetics
Background:
- Leprosy (Hansen's disease) is rare in Japan but prevalent globally.
- This study focuses on two Brazilian sisters working in Japan who presented with leprosy.
- Understanding leprosy's presentation in non-endemic regions is crucial for public health.
Observation:
- Two sisters presented with distinct leprosy types: BB (younger) and TT (elder).
- Both patients exhibited a dominance of CD4+, 4B4+ helper/inducer T-cells within granulomas.
- No acid-fast bacilli were microscopically detected in tissue biopsies.
Findings:
- Polymerase chain reaction (PCR) confirmed Mycobacterium leprae-specific DNA fragments in both peripheral blood and biopsy specimens.
- Human Leukocyte Antigen (HLA) profiles differed between the sisters, suggesting genetic influences on disease presentation.
- The presence of M. leprae DNA despite negative bacilli in biopsies highlights the sensitivity of molecular detection methods.
Implications:
- This case underscores the importance of considering leprosy in individuals with relevant travel or work history, even in low-prevalence areas.
- The findings emphasize the utility of PCR in diagnosing leprosy, particularly in paucibacillary cases.
- Further research into host genetics (HLA types) and immune responses could elucidate variations in leprosy manifestations.