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Sowda-type onchocerciasis in Guatemala
Acta Tropica
|December 1, 1983
Summary
Sowda, an unusual form of onchocercal dermatitis, presents as localized, asymmetrical skin reactions in contrast to the typical generalized form. This study identifies sowda-type dermatitis in Guatemalan patients, highlighting distinct immune responses and clinical presentations.
Area of Science:
- Dermatology
- Infectious Diseases
- Immunology
Background:
- Onchocercal dermatitis typically manifests as generalized, symmetrical skin inflammation in affected individuals, often associated with suppressed immune responses and high microfilarial loads.
- A less common variant, "sowda," is characterized by localized, asymmetrical dermatitis, typically observed in Yemenite populations and a subset of African patients, with signs of heightened immune activity and low microfilarial counts.
Observation:
- This study reports on two Guatemalan patients presenting with sowda-type onchocercal dermatitis.
- Key diagnostic features included asymmetrical papular pruritic dermatitis, minimal to absent microfilariae in the skin, a positive Mazzotti reaction, and characteristic histopathological findings consistent with sowda.
Findings:
- The Guatemalan patients exhibited clinical and diagnostic features aligning with the sowda subtype of onchocercal dermatitis.
- This presentation challenges the previously established geographical association of sowda primarily with Yemenite and certain African populations.
Implications:
- The findings suggest that sowda-type onchocercal dermatitis may occur in diverse geographical regions beyond its traditionally recognized locations.
- Recognizing this atypical presentation is crucial for accurate diagnosis and effective management of onchocerciasis in different patient populations.
- Further research is warranted to understand the immunological and etiological factors contributing to the development of sowda-type onchocercal dermatitis.