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Assessing stool quantities generated by three specific kato-katz thick smear templates employed in different settings

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Infectious Diseases of Poverty 2016年第1期5卷 491-498页

作者： Andrea Leuenberger Tatu Nassoro Khadija Said Lukas Fenner George Sikalengo Emilio Letang Antonio Montresor Xiao-Nong Zhou Peter Steinmann Hanspeter Marti Jürg Utzinger Stefanie Knopp Swiss Tropical and Public Health Institute P.O.BoxCH-4002 BaselSwitzerland University of Basel P.O.BoxCH-4003 BaselSwitzerland Exercise Physiology Lab Institute of Human Movement Sciences and SportETH ZurichWinterthurerstrase 190CH-8057 ZurichSwitzerland Bagamoyo Research and Training Centre Bagamoyo District HospitalIfakara Health InstituteP.O.Box 74BagamoyoUnited Republic of Tanzania Institute of Social and Preventive Medicine University of BernFinkenhubelweg 11CH-3012 BernSwitzerland Ifakara Health Institute Off Mlabani PassageP.O.Box 53IfakaraUnited Republic of Tanzania Department of Control of Neglected Tropical Diseases World Health OrganizationAvenue Appia 20CH-1211 Geneva 27Switzerland Chinese Center for Disease Control and Prevention National Institute of Parasitic Diseases207 Rui Jin Er RoadShanghai 200025People’s Republic of China Key Laboratory on Biology of Parasite and Vector Ministry of HealthWHO Collaborating Center for MalariaSchistosomiasis and Filariasis207 Rui Jin Er RoadShanghai 200025People’s Republic of China Wolfson Wellcome Biomedical Laboratories Department of Life SciencesNatural History MuseumCromwell RoadLondon SW75BDUnited Kingdom

Background:The kato-katz technique is recommended for the diagnosis of helminth infections in epidemiological surveys,drug efficacy studies and monitoring of control *** assessed the comparability of the average amount of faeces generated by three kato-katz templates included in test kits from two different ***:Nine hundred kato-katz thick smear preparations were done;300 per *** slides,slides plus kato-katz template filled with stool and slides plus stool after careful removal of the template were weighed to the nearest 0.1 *** average amount of stool that was generated on the slide was calculated for each template,stratified by standard categories of stool consistency(***,soft,sausage-shaped,hard and clumpy).Results:The average amount of stool generated on slides was 40.7 mg(95%confidence interval(CI):40.0–41.4 mg),40.3 mg(95%CI:39.7–40.9 mg)and 42.8 mg(95%CI:42.2–43.3 mg)for the standard Vestergaard Frandsen template,and two different templates from the Chinese Center for Disease Control and Prevention(China CDC),*** stool resulted in considerably lower average weights when the Vestergaard Frandsen(37.0 mg;95%CI:34.9–39.0 mg)or new China CDC templates(37.4 mg;95%CI:35.9–38.9 mg)were used,compared to the old China CDC template(42.2 mg;95%CI:40.7–43.7 mg)and compared to other stool consistency ***:The average amount of stool generated by three specific kato-katz templates was similar(40.3–42.8 mg).Since the multiplication factor is somewhat arbitrary and small changes only have little effect on infection intensity categories,it is suggested that the standard multiplication factor of 24 should be kept for the calculation of eggs per gram of faeces for all investigated templates.

关键词： Accuracy Diagnosis Infection intensity kato-katz technique Schistosomes Soil-transmitted helminths

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