[Quantitative assessment of the intensity of the invasion of Opisthorchis felineus in man].

Basing on calculated data, the authors have revealed a relationship between the efficacy of coproovoscopic methods of opisthorchiasis diagnosis and the intensity of invasion and amount of feces in the sample analyzed. The ranges of application of simple coproovoscopic methods were defined; among other things, the use of a simple Cato's method was validated for epidemiologic studies in a focus with the invasion intensity of more than 35-50 eggs in 1 g of feces.