There are very few reports of a direct association between leprosy and HTLV-1 infection, though clinical leprosy has long been associated with a defect in cell mediated immunity. We studied leprosy patients to see whether an association between leprosy and HTLV-1 infection, and compared leprosy with hepatitis B (HBV) and hepatitis C (HCV) virus infection.
Samples from leprosy patients (395) were collected from 1993 to 1994 at National Leprosarium Kuryu Rakusenen, Gunma prefecture in Japan. There were 216 male and 179 female cases. They wereover 47 years old and mean of their age is 71. Controls (9602) were blood doners over 50 years old at Gunma prefecture. There were 6554 male and 3048 female cases.
All sera (leprosy and controls) were screened for HTLV-1 by enzyme immunoassay. All sera positive or doubtful by at least one of the two techniques were studied by immunofluorescence assay and by Western blot. Antigens and antibodies to HBs were screened with sandwich immunoassay and detected by IMX ETA. Antibodies to HCV were detected by passive hemagglutination assay.
Statistical analyses were conducted with χ
2 test.
The prevalence of HTLV-1 antibodies in leprous patients (8.4%) is significantly higher than in controls (0.62%) at Gunma prefecture. The seroprevalence of lepromatous leprosy (L form) is double of tuberculoid leprosy (T form): 9.3% and 4.1%.
HBs antigen positive patients are all L form (3 males, 2 females).
The HBs antibodies prevalence in leprous patients (22.5%) is significantly higher than in controls (4.64%). However the seroprevalence of L form (20.8%) is significantly lower than T form (31.8%).
The HCV antibodies prevalence with leprosy (32.0%) is significantly higher than that with blood doners (1.97%).
The significant difference is not found on the prevalence rates between L form (33.2%) and T form (27.3%).
There is suggested that easily infective against HTLV-1 in leprosy as similar to HBV and HCV. It is suspected that patients with leprosy may be associated with a defect in cell mediated immunity by HTLV-1, HBV and HCV as same as Mycobacterium leprae.
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