International Scholarly Research Notices / 2013 / Article / Tab 2

Research Article

Comparison of the Kato-Katz, Wet Mount, and Formol-Ether Concentration Diagnostic Techniques for Intestinal Helminth Infections in Ethiopia

Table 2

Wet mount, Kato-Katz, and FEC techniques results compared to the gold standard by species of common helminthes from students of Atse Fasil General Elementary School, Northwest Ethiopia, March 10–June 30, 2008.

ParasiteTechniqueInfected students no. (%)NPV (95% CI)Sensitivity (95% CI)

S. mansoni Gold standard154 (43.5)
Kato katz148 (41.8) 97.1% (0.95–0.97)96.1% (0.94–0.96)
FEC90 (25.4)75.8% (0.74–0.75)58.4% (0.55–0.58)
Wet mount34 (9.6)62.5% (0.61–0.62)22.1% (0.194–0.221)

A. lumbricoides Gold standard102 (28.8)
Kato-Katz95 (26.8)97.3% (0.95–0.97)93.1% (0.89–0.93)
FEC83 (23.4)93.0% (0.92–0.93)81.4% (0.77–0.81)
Wet mount53 (15)83.7% (0.82–0.83)52.0% (0.48–0.52)

T. trichiura Gold standard64 (18.1)
Kato-Katz58 (16.4)98.0% (0.97–0.98)90.6% (0.85–0.91)
FEC37 (10.5)91.5% (0.90–0.92)57.8% (0.52–0.58)
Wet mount8 (2.3)83.8% (0.83–0.84)12.5% (0.07–0.12)

Hook wormGold standard29 (8.2)
Kato-Katz20 (5.6)97.3% (0.96–0.97)69.0% (0.57–0.69)
FEC21 (5.9)97.6% (0.97–0.98)72.4% (0.60–0.72)
Wet mount11 (3.1)94.8% (0.94–0.95)37.9% (0.27–0.38)

FEC: formol-ether concentration, NPV: negative predictive value.

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