Article (Scientific journals)
Swimmer's Itch in Belgium: First Recorded Outbreaks, Molecular Identification of the Parasite Species and Intermediate Hosts.
Caron, Yannick; Cabaraux, Ariane; Maréchal, Françoise et al.
2017In Vector Borne and Zoonotic Diseases
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Keywords :
Belgium; Radix auricularia; Radix balthica; Trichobilharzia franki; molecular approach; ocellate furcocercariae
Abstract :
[en] BACKGROUND: Cercarial dermatitis or swimmer's itch is a skin condition in humans due to the larval forms of bird schistosomes of some species of the genus Trichobilharzia. The life cycle of these schistosomes requires freshwater snails (intermediate host) and waterfowl (definitive host). Repeated exposures to cercariae can lead to skin sensitization with the induction of pruritic skin lesions. METHODS: We describe, in this study, two outbreaks of human cercarial dermatitis at the Eau d'Heure Lakes, Belgium. In July and August 2012, a total of, respectively, 78 and 10 people reported a sudden skin rash accompanied by pruritus following recreational activities in the Plate Taille Lake. However, no ocellate furcocercariae were detected following light exposure of the snails collected between September 2012 and September 2013 (n = 402). No outbreaks were recorded in 2013 and 2014. In August 2015, about 30 new cases were recorded. Snails were collected (n = 270) in different locations around the lake. PCR was used to identify accurately the intermediate hosts and the parasite species involved. RESULTS: After light exposure, seven Radix spp. (2.6%) shed ocellate furcocercariae. Molecular identification based on the rDNA internal transcribed spacer 2 sequence ascribed the infected snails to R. balthica ( = R. peregra = R. ovata) (6/7) and R. auricularia (1/7). Based on the amplification of the D2 domain of the 28S rDNA, the cercariae were shown to belong to two different haplotypes of Trichobilharzia franki. CONCLUSIONS: This is the first record in Belgium of T. franki and associated skin condition.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Caron, Yannick ;  Université de Liège > Département de morphologie et pathologie (DMP) > Département de morphologie et pathologie (DMP)
Cabaraux, Ariane
Maréchal, Françoise 
Losson, Bertrand ;  Université de Liège > Département des maladies infectieuses et parasitaires (DMI) > Parasitologie et pathologie des maladies parasitaires
Language :
English
Title :
Swimmer's Itch in Belgium: First Recorded Outbreaks, Molecular Identification of the Parasite Species and Intermediate Hosts.
Publication date :
2017
Journal title :
Vector Borne and Zoonotic Diseases
ISSN :
1530-3667
eISSN :
1557-7759
Publisher :
Mary Ann Liebert, United States - New York
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 28 January 2017

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