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Query: UMLS:C0851341 (infestation)
 10,121 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The reasons of the dramatically aggravated cercarial situation were examined in the Naroch Lake area (Minsk Province, Byelorussia). The incidence of infection with cercariae of the family Schistosomatidae trematodes in 8 mollusk species of the genera Lymnaea, Planorbarius, Planorbis, Anisus which were nonuniformly distributed in the upper littoral were studied. The snails form mosaic congestions of various density (from solitary individuals in a 50-100 m2 area to hundreds per m2), which is associated with the nature of aquaphytocenoses and the degree of plant overgrowth. The snails infected with Trichobilharzia ocellata and Bilharziella polonica cercariae accounted for 18.8%. Schistosoma cercariae affected L. stagnalis, L. ovata, and L.p. corvus to the greatest extent. The proportion of ducks (Anas platyrhyncha) infected with the two Schistosomatidae is 30.0% in the area in question with the average infestation rate of as many as 20 trematodes of both sexes per duck. High-risk areas for human infestation (with the number of Schistosoma cercariae exceeding 10 larvae in 10 liters of water) were recorded in the upper littorals in the beach zones of all recreation institutions such as sanatoria, rest homes, camping, etc.). The fact that Schistosoma cercariae can be active in attacking man under the conditions of the Naroch Lake littoral was verified by the self-infestation of one of the authors (S.A. Be'er). Schistosome dermatitis showing its typical clinical manifestations developed after 120-130 cercariae had penetrated into the arms and legs.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Human cercariasis caused by schistosomatid larvae from aquatic birds in the Narochanka River recreational area of Byelarus]. 747 91

A POTENTIAL PUBLIC HEALTH PROBLEM: Cercarial dermatitis is caused by the infestation of the skin by cercariae of nonhuman schistosomes whose commonest hosts are aquatic birds. Human contamination can occur during swimming in fresh water infested with cercariae and notably ducks. Its geographic distribution is worldwide and is increasingly described in France during the summer months. FROM A CLINICAL POINT OF VIEW: A diffuse eruption composed of prurigenous maculopapules appears within the 24 hours following exposure. Regression is spontaneous within one day to three weeks. PREVENTION IS ADVISABLE: Treatment is symptomatic in the majority of patients. The optimal prevention, for bathers, is to swim in sufficiently deep water.
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PMID:[Cercarial dermatitis]. 1510 73

Swimmer's itch is a re-emerging human disease caused by bird schistosome cercariae, which can infect bathing or working people in water bodies. Even if cercariae fail after penetrating the human skin, they can cause dangerous symptoms in atypical mammal hosts. One of the natural methods to reduce the presence of cercariae in the environment could lie in the introduction of non-host snail species to the ecosystem, which is known as the "dilution" or "decoy" effect. The caenogastropod Potamopyrgus antipodarum-an alien in Europe-could be a good candidate against swimmer's itch because of its apparent resistance to invasion by European bird schistosome species and its high population density. As a pilot study on this topic, we have carried out a laboratory experiment on how P. antipodarum influences the infestation of the intermediate host Radix balthica (a native lymnaeid) by the bird schistosome Trichobilharzia regenti. We found that the co-exposure of 200 P. antipodarum individuals per one R. balthica to the T. regenti miracidia under experimental conditions makes the infestation ineffective. Our results show that a non-host snail population has the potential to interfere with the transmission of a trematode via suitable snail hosts.
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PMID:Potamopyrgus antipodarum as a potential defender against swimmer's itch in European recreational water bodies-experimental study. 2996 28