Onchocerciasis: clinical presentation and host parasite interactions in patients of southern Sudan.

Abstract:

BACKGROUND:Onchocerciasis, an infection by the filarial nematode Onchoverca volvulus, is widely distributed in tropical Africa and of great dermatologic interest. This study analyses the dermatologic presentation and tries to determine the correlations between clinical disease and host parasite interactions in onchocerciasis patients of the Southern Sudan. METHODS:We performed clinical and histopathologic investigations in patients with onchocerciasis in the Wau District, Bahr el Ghazal Province, Southern Sudan. As well as a detailed clinical skin examination, skin biopsies were taken, processed, and investigated for type and degree of host tissue response. Parasitologic, clinical, and histopathologic findings were evaluated. RESULTS:Onchocerciasis appears with a variety of severe skin lesions. Central is a pruritic rash. Long-standing cases develop extensive pigmentary changes and impressive signs of skin tissue exhaustion. Cellular host tissue responses to degenerating skin microfilariae seem to play a key role in the development of skin pathology. The degree of host response appears to be inversely proportional to the host's microfilarial load. CONCLUSIONS:Onchocerciasis represents a health problem of great dermatologic importance in Southern Sudan. The study results demonstrate clinical variations in onchocerciasis and provide support for the existence of a disease spectrum.

journal_name

Int J Dermatol

authors

Stingl P

doi

10.1046/j.1365-4362.1997.00007.x

subject

Has Abstract

pub_date

1997-01-01 00:00:00

pages

23-8

issue

1

eissn

0011-9059

issn

1365-4632

journal_volume

36

pub_type

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