| cercariae of trichobilharzia szidati neuhaus, 1952 (trematoda: schistosomatidae): the causative agent of cercarial dermatitis in bohemia and moravia. | | 1992 | 1291457 |
| [swimmers' dermatitis in an excavation pool--an incentive for the status analysis of the water and for the preparation of an ecology-friendly utilization concept]. | in recent years, swimmer's itch occurred in several ground water lakes dud excavation pools in sporadic or epidemic outbreaks in the upper rhine valley. they were caused by trichobilharzia szidati. the public health offices in offenburg and freiburg have been dealing extensively with this problem. they were also requested to comment on the use of lakes within a framework for regional development (landschaftsrahmenplan) by the southern upper rhine regional authority. an ecological study of water ... | 1991 | 1827888 |
| [duck bilharziasis in the medical anthropologic perspective. interview data as a principle for public health control measures]. | trichobilharzia szidati causes a parasitic disease of water fowl that may lead to a badly itching but otherwise harmless dermatitis in man (swimmer's itch). at an outbreak at a small lake in offenburg that is used for swimming, the state health office as the agency responsible for water quality control assessed the situation from an epiemiological perspective and took protective measures. a medical anthropological field study, employing the techniques of observation and interviews, looked into i ... | 1989 | 2524697 |
| the occurrence of cercarial dermatitis in central bohemia. | the occurrence of a dermatitis was reported from 4 natural water reservoirs in central bohemia (czechoslovakia) in june and august 1985 and 1986. the clinical course of the disease was suggestive of cercarial dermatitis. exanthema occurred most frequently under the bathing suits of afflicted persons, and on unprotected parts of their skin as well. a total of 5,865 snails (lymnaea auricularia) were collected at the localities nový rybník in príbram, spálený mlýn at lísnice and uhonice. nine indiv ... | 1989 | 2818792 |
| reduction in the severity of hepatosplenic schistosomiasis mansoni in mice by previous exposure to cercariae of the bird schistosome trichobilharzia szidati. | | 1982 | 7069180 |
| serodiagnosis of cercarial dermatitis with antigens of trichobilharzia szidati and schistosoma mansoni. | in patients with parasitologically revealed dermatitis caused by cercariae of avian schistosomes (trichobilhariza szidati) diagnostic indirect immunofluorescence technique (ifat) was employed for the detection of antibodies. the efficacy of antigens prepared from cercariae of t. szidati and schistosoma mansoni was tested in serodiagnosis. the results have shown that antigen of t. szidati is more reactive with the sera of patients than that of s. mansoni: the antibodies were detected already 3 da ... | 1994 | 7812239 |
| [trichobilharzia franki n. sp.--the cause of swimmer's dermatitis in southwest german dredged lakes]. | ocellate furcocercariae from the lymnaeid snail radix auricularia have been identified as causative agents of swimmer's itch, which has become increasingly common in the 'tunisee' near freiburg. on an average 11.0%, maximally 25.0%, of the snails were parasitized with these trematode larvae. the trichobilharzia parasitizing rate in the intermediate hosts found here was thus approximately 10-100 times higher than the trichobilharzia prevalence described so far. dwarf mallards (anas platyrhynchos, ... | 1994 | 8173581 |
| developmentally regulated expression of surface carbohydrate residues on larval stages of the avian schistosome trichobilharzia szidati. | except other functions, surface saccharide residues on trematode larvae are supposed either to be the targets of the intermediate (molluscan) and final host immune systems, or to represent candidates for molecular mimicry. therefore, changes in surface saccharide patterns during the development of the avian schistosome trichobilharzia szidati were characterized. whole parasite larval stages and their tissue sections were examined using fitc- conjugated lectins. marked surface differences were fo ... | 1995 | 8774780 |
| the effect of bacillus thuringiensis m-exotoxin on trematode cercariae | the effect of bacillus thuringiensis israelensis eluate containing water-soluble exotoxin (m-exotoxin) was observed by its use on cercariae of seven trematode species. to the most sensitive species to the toxic effect of the mentioned toxin belonged schistosome furcocercariae (human species schistosoma mansoni and avian parasite trichobilharzia szidati). under the influence of the toxin, surface syncytial structure (tegument) was separated from underlying tissues, with subsequent disintegration ... | 1996 | 8812565 |
| karyotype of an avian schistosome trichobilharzia szidati (digenea: schistosomatidae). | somatic chromosomes of trichobilharzia szidati neuhaus, 1952 are described from larval stages dissected from snails, air-dried on slides and stained with giemsa and c-banding technique, used for the first time in trichobilharzia sp. the karyotype consisted of 7 autosomal pairs and 1 pair of sex chromosomes, zz in the male and zw in the female, where z and w chromosomes are of different sizes and both are classified as submetacentric. c-banding aided in identification of chromosomes nos 4, satell ... | 1996 | 8894770 |
| cercaria-schistosomulum surface transformation of trichobilharzia szidati and its putative immunological impact. | schistosome cercariae of the genus trichobilharzia are the causative agent of swimmers' itch. in order to characterize the changes in parasites during and after the penetration of the host skin, in vitro and in vivo (in ducks and mice) transformations of t. szidati cercariae to schistosomula were performed. ultrastructural observation revealed that cercariae possess a simple outer tegumental membrane with a thick glycocalyx. as with human schistosomes, the latter structure disappears during tran ... | 1998 | 9509023 |
| survival of bird schistosomes in mammalian lungs. | bird schistosome cercariae have a low specificity to vertebrate skin and, thus, they are also able to penetrate into mammals. as a consequence, a hypersensitive skin response-cercarial dermatitis-develops. it was thought that the parasites die in the skin soon after penetration. our results on trichobilharzia szidati and bilharziella polonica in the non-specific murine host confirm that some of the penetrating bird schistosomes may fully transform to schistosomula and migrate to the lungs. they ... | 2000 | 10675746 |
| is there a potential danger of "swimmer's itch in poland? | tests with cercariae of trichobilharzia szidati (neuhaus, 1952) and bilharziella polonica (kowalewski, 1895) from naturally parasitised host snails from lake jeziorak in north poland were carried out on human volunteers under laboratory conditions. only t. szidati was capable of causing the symptoms of "swimmer's itch". in the experiment with b. polonica no symptoms of dermatitis were observed either after the first or second exposure. | 2003 | 12474045 |
| [biology and development of trichobilharzia szidati n. sp. (trematoda, schistosmatidae), a parasite causing dermatitis in man]. | | 1952 | 14951656 |
| presence of trichobilharzia szidati in lymnaea stagnalis and t. franki in radix auricularia in northeastern france: molecular evidence. | a molecular approach was used to analyse a focus of cercarial dermatitis in northeastern france (lake der-chantecoq), including both cercariae and snails,by sequencing the internal transcribed spacers (its1 for ocellate furcocercariae and its2 for snails). lymnaea stagnalis were found infected with the furcocercariae of trichobilharzia szidati, and t. franki furcocercariae were found in radix auricularia. the record of these two visceral parasites of birds in northern france confirms strong host ... | 2004 | 15609060 |
| in vitro stimulation of penetration gland emptying by trichobilharzia szidati and t. regenti (schistosomatidae) cercariae. quantitative collection and partial characterization of the products. | induction of penetration gland emptying by cercariae of the bird schistosomes trichobilharzia szidati and t. regenti employing linoleic acid, linolenic acid, praziquantel and calcium ionophore a23187 showed that both postacetabular and circumacetabular cells released their content at chosen stimulant concentrations. the gland secretions consisted of soluble and insoluble parts. the former one adhering to the ground seemed to have different saccharide composition from the glands of schistosoma ma ... | 2005 | 15868186 |
| do larvae of trichobilharzia szidati and echinostoma revolutum generate behavioral fever in lymnaea stagnalis individuals? | the objective of this study was to determine whether individuals of lymnaea stagnalis naturally parasitized with trichobilharzia szidati and echinostoma revolutum can generate the behavioral fever against larvae of those parasites. thermal preferences of each snail were examined in an oblong thermal gradient during 48 h observation. uninfected animals under study chose higher temperatures than those releasing cercariae of parasites. infected snails kept in constant temperature lived shorter than ... | 2005 | 15952039 |
| trichobilharzia szidati: the lung phase of migration within avian and mammalian hosts. | the passage of trichobilharzia szidati schistosomula through the vertebrate lungs was examined in natural and abnormal hosts--birds (ducks anas platyrhynchos f. domestica) and mammals (mice mus musculus bagg albino/c [balb/c]), respectively. using the methods of classical histology, the migratory route of worms was characterized, and the impact of migration on host tissues and the host cell reactions were evaluated. living schistosomula were recorded in the lungs of ducks 2-10 days post infectio ... | 2007 | 17177058 |
| cream formulations protecting against cercarial dermatitis by trichobilharzia. | dermatitis caused by penetrating bird schistosome cercariae is an emerging global public health problem. infections may be prevented by the use of topical formulations that inhibit cercarial skin penetration. we evaluated nine water resistant formulations by exposing treated arms of volunteers to trichobilharzia szidati cercariae. six formulations protected from cercarial invasion. however, after immersion of the treated skin in water (2 x 20 min), only two formulations offered full protection: ... | 2007 | 17252275 |
| penetration of trichobilharzia cercariae into mammals: dangerous or negligible event? | bird schistosomes and cases of human cercarial dermatitis occur worldwide, but the number of cases is not monitored. experiments with two schistosomes, namely trichobilharzia szidati and t. regenti, show that they possess potent tools to penetration bird and mammalian skin, as well as exhibit species-specific migration patterns within vertebrate bodies. therefore, the infections may affect different organs/tissues e.g. lungs or spinal cord. in this minireview, the adaptations and pathogenic effe ... | 2008 | 18814698 |
| in vitro cultivation of early schistosomula of nasal and visceral bird schistosomes (trichobilharzia spp., schistosomatidae). | cercariae of bird schistosomes (trichobilharzia szidati and trichobilharzia regenti) were mechanically stimulated to transform to schistosomula and kept in different cultivation media supplemented with duck red blood cells and/or homogenized nervous tissue. the development under in vitro conditions was compared with that in vivo, using the following characters: emptying of penetration glands, surface changes, food uptake, and growth of early schistosomula. the results show that the cultivation m ... | 2009 | 19238442 |
| schistosomes in the north: a unique finding from a prosobranch snail using molecular tools. | samples of schistosome cercariae from three different snail species (lymnaea stagnalis, radix auricularia and valvata (tropidina) macrostoma) collected from lakes in central finland were analyzed using molecular techniques. based on sequences of its region of rdna, the parasite isolates from l. stagnalis and r. auricularia belong to trichobilharzia szidati and t. franki, respectively. this confirms a wide distribution of these two species in europe. on the other hand, the isolates from v. macros ... | 2009 | 19345742 |
| penetration of cercariae into the living human skin: schistosoma mansoni vs. trichobilharzia szidati. | we studied the skin invasion of schistosoma mansoni cercariae by placing gamma-irradiated and nonirradiated cercariae onto the living human skin and timing the behavior of 53 individuals. the skin invasion of s. mansoni was less efficient compared to the bird schistosome trichobilharzia szidati. s. mansoni cercariae crept longer on the skin after attachment until they started penetration movements (median of 43 s [range of 15 s-6.58 min]; t. szidati, median of 8 s [range of 0-80 s]). subsequent ... | 2009 | 19543747 |
| molecular systematics of the avian schistosome genus trichobilharzia (trematoda: schistosomatidae) in north america. | trichobilharzia is a genus of threadlike schistosomes with a cosmopolitan distribution in birds. species of trichobilharzia achieve notoriety as major etiological agents of cercarial dermatitis, or swimmer's itch. there are 40 species described in the literature, for which the majority lacks molecular sequence information. to better understand the phylogenetic relationships, diversity, species boundaries, host use, and geographic distribution of this genus better, we surveyed 378 birds and over ... | 2009 | 20049999 |
| detection of european trichobilharzia schistosomes ( t. franki , t. szidati , and t. regenti ) based on novel genome sequences. | the most frequent causative agents of cercarial dermatitis in europe are the avian schistosomes of the genus trichobilharzia . they preferably parasitize birds of the anatidae. trichobilharzia spp. schistosomes are also able to penetrate mammalian skin, posing a health risk to mammals, including humans. currently several loci from nuclear and mitochondrial genomes are determined for european species of trichobilharzia . among them there is 1 genome sequence, tosau3a, which is suitable for detect ... | 2010 | 20677938 |
| [polymorphism of the cox1 gene in bird schistosome cercaria isolates (trematoda, schistosomatidae) from ponds of moscow and moscow oblast]. | polymorphism of a 8 10-bp mitochondrial cox1 gene region was studied in 16 cercaria isolates of bird schistosomes (family schistosomatidae), which were collected in water bodies of moscow and moscow oblast and represented three species: trichobilharzia szidati, t. franki, and t. regenti. a substantial predominance of at (65.4%) was characteristic of the cox1 sequences in all three species. rare single nucleotide substitutions determined low (0.2-0.9%) intraspecific nucleotide and amino acid sequ ... | 2010 | 20795503 |
| the neuro-muscular system in fresh-water furcocercaria from belarus. i schistosomatidae. | the neuro-muscular system (nms) in cercariae of the family schistosomatidae from belarus was studied with immunocytochemical methods and confocal scanning laser microscopy. the specimens of bilharziella polonica were compared with trichobilharzia szidati and trichobilharzia franki. the patterns of f-actin in the musculature, 5-ht-immunoreactive (ir), fmrfamide-ir neuronal elements and α-tubulin-ir in sensory receptors and nerves were investigated. no indications of structural differences in the ... | 2011 | 21614541 |
| genetic differentiation of cercariae infrapopulations of the avian schistosome trichobilharzia szidati based on rapd markers and mitochondrial cox1 gene. | avian schistosome trichobilharzia szidati is a member of the largest genus within the family schistosomatidae (trematoda). population genetic structure of trichobilharzia spp. schistosomes, causative agents of cercarial dermatitis in humans, has not been studied yet. the knowledge of the genetic structure of trichobilharzian populations is essential for understanding the host-parasite coevolutionary dynamics and epidemiology strategies. here we examined genetic diversity in three geographically ... | 2011 | 21796386 |
| the neuromuscular system in freshwater furcocercaria from belarus. ii diplostomidae, strigeidae, and cyathocotylidae. | the neuromuscular system (nms) in cercariae of diplostomum pseudospathaceum, cotylurus szidati, australapatemon burti, holostephanus volgensis, and paracoenogonimus ovatus was studied with immunocytochemical methods and confocal scanning laser microscopy. the patterns of f-actin in the musculature, 5-ht immunoreactive (-ir), fmrf-amide-ir neuronal elements, and a-tubulin-ir in sensory receptors were investigated. the nms in the five species studied were compared with each other and with three sp ... | 2011 | 21748349 |
| structural and population polymorphism of rt-like sequences in avian schistosomes trichobilharzia szidati (platyhelminthes: digenea: schistosomatidae). | recently we developed the genus-specific markers of the avian schistosomes of the genus trichobilharzia, the causative agents of human cercarial dermatitis. the 7 novel genome sequences of t. franki, t. regenti, and t. szidati revealed similarity with genome repeat region of african schistosome schistosoma mansoni. in the present work we analyzed the 37 new t. szidati sequences to study intragenome variability and host specificity for the parasite from three localities of east europe. dnas were ... | 2015 | 26114104 |
| molecular diversity of avian schistosomes in danish freshwater snails. | avian schistosomes are widespread parasites of snails and waterfowl and may cause cercarial dermatitis (swimmer's itch) in humans, a disease that is frequently reported in european countries. these parasites are known to occur in denmark, but here, we applied a new approach using molecular tools to identify the parasites at species level. in order to do that, 499 pulmonate freshwater snails (radix sp., lymnaea stagnalis, stagnicola sp. and planorbarius corneus) were sampled from 12 lakes, ponds, ... | 2016 | 26573519 |
| the early worm catches the bird? productivity and patterns of trichobilharzia szidati cercarial emission from lymnaea stagnalis. | digenean trematodes are common and abundant in aquatic habitats and their free-living larvae, the cercariae, have recently been recognized as important components of ecosystems in terms of comprising a significant proportion of biomass and in having a potentially strong influence on food web dynamics. one strategy to enhance their transmission success is to produce high numbers of cercariae which are available during the activity peak of the next host. in laboratory experiments with 13 lymnaea s ... | 2016 | 26895541 |