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ONCHOCERCIASIS - Coggle Diagram
ONCHOCERCIASIS
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Life cycle
During a blood meal, an infected blackfly (genus Simulium) introduces third-stage filarial larvae onto the skin of the human host, where they penetrate into the bite wound.
The larvae develop into adult filariae, which commonly reside in nodules in subcutaneous connective tissues
They are occasionally found in peripheral blood, urine, and sputum but are typically found in the skin and in the lymphatics of connective tissues
After ingestion, the microfilariae migrate from the blackfly’s midgut through the hemocoel into the thoracic muscles
The infection is spread when a black fly bites an infected person and becomes infected with microfilariae
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Clinical Presentation
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Onchocercal skin disease
Onchocercomata ( subcutaneous nodules ) : deep, nonpalpable nodules found over various bony prominences
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Prevention
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Wearing suitable clothing( such as long sleeves, boots and gloves)
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