Confirmation of the presence of Trichobilharzia by examination of water samples and snails following reports of cases of cercarial dermatitis

In case of cercarial dermatitis after exposure to fresh water lakes, managers responsible for bathing water quality wish to confirm the presence of Trichobilharzia, which substantiates taking measures to protect bathers from further exposure. A novel approach, including concentration of suspected wa...

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Veröffentlicht in:Parasitology 2010-01, Vol.137 (1), p.77-83
Hauptverfasser: SCHETS, F. M., LODDER, W. J., DE RODA HUSMAN, A. M.
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description In case of cercarial dermatitis after exposure to fresh water lakes, managers responsible for bathing water quality wish to confirm the presence of Trichobilharzia, which substantiates taking measures to protect bathers from further exposure. A novel approach, including concentration of suspected water samples by filtration and PCR detection of the parasite, is proposed. This approach has been applied to bathing sites with a history of cercarial dermatitis, sampled from 2005 to 2008. Examination of snails, the standard procedure for confirmation of the parasite's presence, and analysis of water samples, appear to be complementary procedures that enhance the chance of parasite detection in implicated bathing water. Water analysis is particularly valuable when snails cannot be found; it confirmed the presence of Trichobilharzia on 25% of sampling days with reported skin conditions and no snails found. PCR of the ToSau3A repeat directly confirmed the parasite in the water. The application of the combination of analysis of water samples and examination of snails is suggested when cases of (presumptive) cercarial dermatitis are reported or when lakes with a history of cercarial dermatitis are inspected prior to the bathing season, in order to guide interventions to prevent (further) cases of swimmers' itch.
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M.</au><au>LODDER, W. J.</au><au>DE RODA HUSMAN, A. M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Confirmation of the presence of Trichobilharzia by examination of water samples and snails following reports of cases of cercarial dermatitis</atitle><jtitle>Parasitology</jtitle><addtitle>Parasitology</addtitle><date>2010-01</date><risdate>2010</risdate><volume>137</volume><issue>1</issue><spage>77</spage><epage>83</epage><pages>77-83</pages><issn>0031-1820</issn><eissn>1469-8161</eissn><coden>PARAAE</coden><abstract>In case of cercarial dermatitis after exposure to fresh water lakes, managers responsible for bathing water quality wish to confirm the presence of Trichobilharzia, which substantiates taking measures to protect bathers from further exposure. A novel approach, including concentration of suspected water samples by filtration and PCR detection of the parasite, is proposed. 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The application of the combination of analysis of water samples and examination of snails is suggested when cases of (presumptive) cercarial dermatitis are reported or when lakes with a history of cercarial dermatitis are inspected prior to the bathing season, in order to guide interventions to prevent (further) cases of swimmers' itch.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><pmid>19691864</pmid><doi>10.1017/S0031182009990849</doi><tpages>7</tpages></addata></record>
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subjects Animals
Biological and medical sciences
cercarial dermatitis
Dermatitis
Dermatitis - epidemiology
Dermatitis - parasitology
Fresh Water - parasitology
Freshwater
Freshwater lakes
Fundamental and applied biological sciences. Psychology
General aspects
General aspects and techniques. Study of several systematic groups. Models
Humans
Invertebrates
Microscopy - methods
Mollusca
Nemathelminthia. Plathelmintha
Netherlands - epidemiology
Parasites
Polymerase Chain Reaction - methods
recreational water
Schistosomatidae - genetics
Schistosomatidae - isolation & purification
schistosomes
Schistosomiasis - epidemiology
Schistosomiasis - parasitology
Skin Diseases, Parasitic - epidemiology
Skin Diseases, Parasitic - parasitology
Snails - parasitology
swimmers' itch
Swimming
Trichobilharzia
Water analysis
Water quality
Water sampling
title Confirmation of the presence of Trichobilharzia by examination of water samples and snails following reports of cases of cercarial dermatitis
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