Under diagnosis of intestinal schistosomiasis in a referral hospital, North Ethiopia

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OBJECTIVE: The present cross-sectional study was aimed at determining the magnitude of under diagnosis of intestinal schistosomiasis among patients requested for routine ova/parasite examination at Ayder referral hospital. RESULTS: A total of 280 stool samples were collected and only 5% of the patients were positive for ova of Schistosoma mansoni in the routine direct wet mount microscopy. On the other hand, 12.5% of the patients were positive for ova Schistosoma mansoni when the stool samples were processed by either Kato Kat or formol ether concentration techniques. Moderate test agreement (κ = 0.48) was recorded for wet mount. Formol-ether concentration (κ = 0.89) and Kato-Katz (κ = 0.92) showed excellent agreements with the 'Gold' standard. Direct wet mount technique exhibited the poorest sensitivity (35%) of detection of ova of Schistosoma mansoni. Hence, the Kato-Katz technique should be implemented in parallel with the direct wet mount microscopy for Schistosoma mansoni presumptive patients.

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