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PubMed2004

[Intestinal parasites infection of horses from riding clubs in Kraków area].

The studies were carried out in 2001 and 2002 on horses from riding clubs in Krakow area. On the basis of McMaster method EPG (eggs per gram) and prevalence of infection (%) was evaluated. The most common parasites were strongyles (Strongylidae). In the first year of study in dynamics of strongyles eggs output of horses kept on paddocks two peaks were observed: in May (450 EPG) and January (427 EPG), in comparison with horses under pasture system where the highest level of strongyles eggs output were in May (832 EPG), from August (420 EPG) to October (385 EPG) and in March (482 EPG). In the second year of study seasonal mean prevalence (from April to October) as well as EPG were higher in horses under pasture system (73.9% and 781 EPG) than in horses on paddocks with grass (42.1% and 251 EPG) and horses on paddocks without grass (19.2% and 157 EPG).

Animal Husbandry↗
PubMed2001

[New/old opinions on the systematics and phylogenesis of the nematodes, with the special regard to Ascaridida, Ascaridoidea].

Traditional classification of the nematodes, based on morphological-ecological characters was evaluated in the context of molecular analysis of systematic taxons, with special regards to ascarids. Division of superfamily Ascaridoidea into 4 families (Heterocheilidae, Ascarididae, Anisakidae, Raphidascarididae) proposed by Fagerhholm (1991) seems to be proved by the molecular data of Nadler (1992, 1995) and Nadler & Hudspeth (1998).

Animals↗
PubMed1991

Resistance to benzimidazole anthelmintics in small strongyles (Cyathostominae) of horses in Denmark.

This study was undertaken to establish whether anthelmintic resistance was present in nematode parasites of horses in Denmark. Sixteen horse farms were selected for faecal egg count reduction (FECR) tests to measure the efficacy of the anthelmintic used. Resistance to benzimidazole anthelmintics was found on 13 of the 16 farms, with FECR values ranging from 80.0% to -101.3%. On the remaining 3 farms FECR was 100.0%, 99.3% and 97.2%. Results of a questionnaire study on anthelmintic usage, parasite control measures and management practices showed that horses in this study were treated on average 7.1 times/year. Horse owners changed between preparations of drugs but almost only within the same class of anthelmintics. Nine owners gave an anthelmintic treatment to purchased horses before they were introduced on the farm. On 14 farms, the same paddock was grazed every year and the average stocking rate was estimated to be 2.4 horses/ha. Strategies to avoid development of anthelmintic resistance are discussed and recommendations of parasite control on horse farms are presented.

Animals↗
PubMed1991

Species-specific differences in heterogonic development of serially transferred free-living generations of Strongyloides planiceps and Strongyloides stercoralis.

The direction of free-living development (homogonic vs. heterogonic) in Strongyloides stercoralis and Strongyloides planiceps was examined by successive transplantation of the uterine eggs of free-living females into a test tube culture system containing fresh feces. The eggs from the first-generation free-living females of S. stercoralis did not develop into second-generation free-living adult worms, but all developed into filariform larvae. However, the majority of S. planiceps eggs from the first-generation free-living females developed into second-generation free-living adults. By successive transfer of uterine eggs of each generation, 9 generations developed, and in every cycle more adult worms developed than filariform larvae. However, the number of free-living generations was not infinite; in experiments repeated twice, the number of worms developing from the eggs of eighth or ninth generations was too small to continue further culture. These findings indicate that the pattern of free-living development is different between the 2 species.

Animals↗
PubMed1991

Fecundity of gastrointestinal trichostrongylid nematodes of sheep in the field.

Twenty-two Dorset Rambouillet lambs were moved to contaminated pasture on Apr 1, 1987. At regular intervals thereafter, pairs of lambs were withdrawn and euthanatized. Gastrointestinal parasites in the abomasum, small intestine, cecum, and large intestine were removed and counted. The last pair of lambs was euthanatized 8 months after original placement on the contaminated pasture. Fecal samples were taken at 3- to 4-week intervals throughout the grazing season and the fecal egg counts were used to estimate parasite fecundity (output of eggs per female parasite per day). The principal parasite genera found included Haemonchus spp, Trichostrongylus spp, and Nematodirus spp. In each of the genera examined, parasite fecundity remained the same irrespective of the intensity or duration of infection. Estimated average fecundities (eggs/female/day) were as follows: Haemonchus contortus, 6,582; Trichostrongylus spp, 262; Nematodirus spp, 40; and Oesophagostomum venulosum, 11,098.

Abomasum↗
PubMed1991

Resistance of population-B equine strongyles to thiabendazole, oxfendazole, and phenothiazine (1981 to 1987).

Critical tests were completed on foals (n = 15) naturally infected with benzimidazole (BZ)-resistant population-B strongyles during the period between 1981 and 1987. Thiabendazole at a dosage of 44 mg/kg was tested in 8 foals, oxfendazole at 10 mg/kg was tested in 4 foals, and phenothiazine at 55 mg/kg, cambendazole at 20 mg/kg, and fenbendazole at 5 mg/kg were tested in 1 foal each. Efficacies of thiabendazole, cambendazole, and fenbendazole against the 5 species of BZ-resistant small strongyles (Cyathostomum catinatum, Cyathostomum coronatum, Cylicocylus nassatus, Cylicostephanus goldi, and Cylicostephanus longibursatus) were partial. Removals in the aggregate averaged 48%, 52%, and 68%, respectively, indicating continued resistance of the 5 species of small strongyles to thiabendazole, cambendazole, and fenbendazole. In contrast, oxfendazole was efficacious, removing an aggregate average of 95% of the 5 BZ-resistant species of small strongyles in the 4 foals. This apparent reversion to susceptibility to oxfendazole may be attributable to paucity of reference data (1 test foal) done in 1976. All 5 species of the BZ-resistant small strongyles had cross resistance to phenothiazine (38% aggregate removal), whereas 9 of the BZ-susceptible species were effectively (99%) removed. This suggests a similar mode of action between phenothiaznie and the BZ compounds.

Animals↗
PubMed1990

Epidemiology of sheep nematodes in sub-arctic Greenland: sources of infection on rangeland grazing.

Sources of nematode infection on the rangelands of a southern Greenlandic sheep farm were investigated as a part of a study of the epidemiology of Ostertagia and Nematodirus infections in a sub-arctic climate. Herbage larval counts were performed on samples collected from selected localities on the rangeland and post mortem worm-counts made on tracer lambs that had grazed these areas for the latter part of the summer season. Relatively high concentrations of larvae were found in good quality native grasses at sea-level and in grasses growing beneath canopies of willow-shrub at higher altitudes. In general, however, the infectivity of the vegetation was very low and the pick-up of infection by the tracer lambs was correspondingly small.

Animals↗
PubMed1990

[Epidemiology, chemotherapy, anthelmintics-resistance and prevention of Strongylidae infections in horses].

The epidemiology, chemotherapy and control of strongylus infections in the horse are discussed. The annual cycle of various species are stated. In addition the anthelmintics available for treatment and control and the occurrence of anthelmintic resistance are referred to. Finally the options for control under various management conditions (little if any grazing; extensive grazing; intensive grazing) are discussed.

Animals↗
PubMedDate not supplied

[Little-studied parasitic strongylid larvae (Nematoda: Strongylidae) in horses].

Parasitic larvae of 30 strongylid species of horses out of 53 species known for the fauna of the USSR are identified. The paper presents descriptions of 7 earlier unknown phenons of parasitic late 4th-stage larvae, the specific belonging of which in not yet ascertained. The possibility of their identification is discussed.

Animals↗
PubMed1990

Morphology and differential diagnostics of parasitic larvae of some Strongylidae (Nematoda) of horses.

The morphology of L4 of Cylicostephanus minutus, Cylicotetrapedon bidentatus, Petrovinema poculatum, Cylicocyclus radiatus, C. triramosus, Cylicodontophorus euproctus, C. mettami, C. mongolicus, Poteriostomum imparidentatum, Gyalocephalus capitatus and Craterostomum acuticaudatum is discussed. The species are named in accordance with the new system, which is outlined in the introduction. The criteria for the identification of larvae killed during their 4th skinning include distinctive marks occuring in the 4th and 5th stages: gut morphology, position of cervical papillae, excretory opening, morphology of the caudal part of the female. For L4, generic characteristics have not been distinguished (except Petrovinema spp.). Larvae of small Strongylinae species are similar to those of Cyathostominae.

Animals↗
PubMed1989

Observations on dry season strongyle infestations of permanent swamps grazed by cattle in Vom area, Plateau State, Nigeria.

Herbage samples were taken from 4 permanent swamps (2 heavily and 2 lightly pastured) located in Vom area every fortnight from November 1985-April 1986 and November 1986-April 1987. Larvae were extracted by washing and sedimentation and counts expressed as number of larvae per kg dry herbage. Worm larvae seen in faecal cultures were differentiated as Haemonchus, Cooperia and Oesophagostomum and these formed the bulk. Trichostrongylus, Bunostomum and Strongyloides were also seen but these were generally few. Lightly pastured permanent swamps were lightly infested and heavily pastured were contaminated with corresponding high infectivity. Heavily contaminated pastures are with risk from mild dry to late dry season. Dry season routine treatment is therefore necessary for cattle with access to swamps during the dry season especially heavily contaminated ones.

Animals↗
PubMed1989

Critical and controlled tests of activity of a macrocyclic lactone (compound F28249-alpha) against natural infections in internal parasites of equids.

Thirteen critical tests (n = 11 horses and 2 ponies) and 4 controlled tests (n = 4 donkeys and 6 horses) were performed to evaluate the activity of the experimental macrocyclic lactone compound F28249-alpha against internal parasites of equids. In the critical tests, activity was determined mainly against the large parasites, but 1 critical test also included benzimidazole-resistant small strongyles. In the controlled tests, evaluation of drug activity included large parasites and stomach worms in all 4 tests, and lungworms in 2 tests. The period between treatment and euthanasia was 6 to 9 days for the critical tests and 14, 17, or 52 days for the controlled tests. The compound was administered by stomach tube at dose rates of 1, 2, 3, 3.5, or 4 mg/kg of body weight. In the critical tests, removal at all 5 dose rates was 100% for Gasterophilus nasalis (2nd and 3rd instars), Parascaris equorum (mature), Strongylus vulgaris, and Strongulus edentatus from the gastrointestinal tract. For Gasterophilus intestinalis in the stomach, mean removals of 2nd instars were 88% at the rate of 2 mg/kg and 93% to 100% at rates greater than or equal to 3 mg/kg. For 3rd instars, mean removals were 7% at 1 mg/kg, 77% at 2 mg/kg, 90% at 3 mg/kg, and 98% at 3.5 mg/kg. Discharge of G intestinalis in feces was typically a slow, prolonged process and probably higher removal values, especially at lower dose rates, would have attended a longer interval after treatment before necropsy examination.(ABSTRACT TRUNCATED AT 250 WORDS)

Abdominal Muscles↗
PubMedDate not supplied

[The morphology and differential diagnosis of parasitic larvae of Triodontophorus (Nematoda, Strongylidae)].

356 parasitic larvae of the genus Triodontophorus from Equidae (two Equus hemionus and one E. grevyi) have been investigated. They belong to three phenons, which differ from each other by the shape and dimensions of a stoma, the structure of teeth and other signs. That phenons belong to three different species: T. serratus, T. tenuicollis and T. brevicauda. The differential diagnosis of L4 of that species of Triodontophorus are given.

Animals↗
PubMedDate not supplied

[Nematode parasites of birds of the fauna in Tunisia].

330 birds of Tunisia were necropsied; they belong to 73 species among 29 families and 13 orders. We so collect 36 species of nematodes from 9 families. The relative importance of these is variable. The best represented are: Capillariidae (6 species), Spiruridae (6 species), Acuariidae (9 species) and Filariidae (6 species). The parasitism by nematodes is not uniform. Among the 330 birds autopsied only 51 were parasited by nematodes (15.45%) among 25 of the examined birds species (34.2%). Among these 25, sixteen (64%) presented only one species of parasitic nematode, six (24%) arboured two, (8%) three and only one, (partridges) presents six species of nematodes.

Animals↗
PubMed1989

Immunologic and hematologic responses in ponies with experimentally induced Strongylus vulgaris infection.

Immunologic and hematologic responses were examined in 4 ponies with experimentally induced Strongylus vulgaris infection and in 5 helminth-free ponies. Two ponies were inoculated with 200 larvae and 2 were inoculated with 700 larvae of S vulgaris and then were reinoculated with the same numbers of larvae 34 weeks later. Initial response of the ponies inoculated with S vulgaris was S vulgaris antigen-induced lymphocyte response that developed 1.5 to 3 weeks after inoculation and did not persist. Development of antigen-reactive lymphocytes was followed sequentially by a biphasic complement-fixing antibody response, then biphasic eosinophilia. Antibody titer to S vulgaris antigen was higher in ponies inoculated with 700 larvae, compared with that in ponies given 200 larvae of S vulgaris. Also, the second peak in antibody titer and in absolute number of eosinophils was observed earlier in ponies inoculated with 700 larvae, compared with ponies inoculated with 200 S vulgaris larvae, and subsided before or from about 24 weeks after inoculation. The prepatent period for S vulgaris infection was 24 to 25 weeks. After reinoculation with S vulgaris, a degree of increased lymphocyte responsiveness was apparent but, by 17 weeks after reinoculation, only the primary peak in the absolute number of eosinophils indicated an anamnestic response. Essentially, antibody was not detectable after reinoculation.

Animals↗
PubMed1985

Syngamosis, an unusual cause of asthma: the first reported case in Canada.

The first case of syngamosis in a human in Canada is reported. The patient, a traveller to the Caribbean islands, presented with a chronic dry cough. The nematode Syngamus laryngeus is found in wild and domestic birds and mammals in the tropics and subtropics. Humans are only accidental hosts. The diagnosis of syngamosis is usually made by fibreoptic bronchoscopic examination, which reveals the Y-shaped worms in the bronchi or the characteristic eggs in the sputum or feces. Physicians must be alerted to the possibility of syngamosis in patients with symptoms of asthma who have recently travelled to South America or the Caribbean islands.

Aged↗