[occurrence of gaigeria pachyscelis railliet & henry, 1910 (nematoda: ancylostomidae) parasite of ovines in the state of são paulo, brasil (author's transl)]. 1977564685
effect of gamma-irradiation on the survival and development of the infective larvae of the hookworm, gaigeria pachyscelis.irradiation of the infective larvae of gaigeria pachyscelis railliet and henry, 1910 with gamma rays upto 160 kr had no significant effect on the in vitro survival of these larvae for a period of 49 days, maintained either at room temperature (32.2--39.4 degrees c) or at 4 degrees c. however, the behaviour of the irradiated larvae in the lamb host was much changed, as shown by a marked reduction in the worm establishment and the development of stunted and sterile worms from these larvae. as the ...1978571885
the use of gamma-radiation-attenuated larvae of gaigeria pachyscelis railliet and henry, 1910, for vaccination in lambs.the results of vaccination trial in lambs with gamma-irradiated infective larvae of gaigeria pachyscelis are described. a single percutaneous (p/c) vaccination of lambs with 2000 infective larvae irradiated at 40 kr induced the development of resistance. the vaccinated lambs successfully resisted a lethal challenge infection of 5000 non-irradiated larvae 3 months later. in the vaccinated lambs, the manifestations of resistance were shown by marked reduction in the worm establishment, development ...1978571886
recovery of nematodes from ruminants by migration from gastro-intestinal ingesta and mucosa gelled in agar: preliminary report.when gastro-intestinal ingesta and mucosa containing larvae or adult haemonchus contortus, ostertagia circumcincta. trichostrongylus colubriformis, strongyloides papillosus, nematodirus spathiger, gaigeria pachyscelis, oesophagostomum columbianum or chabertia ovina were suspended in 0,75--1,00% agar gel and incubated in physiological saline, a mean of 93,6% of the helminths migrated from the agar-ingesta or agar-mucosa into the physiological saline. the lowest suitable concentration of agar was ...1978704042
parasites of south african wildlife. xii. helminths of nyala, tragelaphus angasii, in natal.the helminths of 77 nyala, tragelaphus angasii, from 4 game reserves in natal, were collected, counted and identified. ten nematode species and 4 nematode genera, a trematode species and paramphistomes, and 2 cestode genera were recovered from the antelope. of these, a cooperia rotundispiculum race, gaigeria pachyscelis, a gongylonema sp., haemonchus vegliai, impalaia tuberculata, an oesophagostomum sp., a setaria sp., trichostrongylus deflexus, trichostrongylus falculatus, the larval stage of a ...19911780128
epidemiology of ovine helminthiasis in haryana, india.tracer lambs were used to study the pasture contamination with infective stages of helminth parasites during one annual cycle in a subtropical climate. post-mortem worm counts indicated that low infections with haemonchus contortus occurred throughout the year except in june. however, twenty five or more h. contortus per lamb were recorded in january, april, may and august. trichostrongylus colubriformis infection was detected throughout the year and 150 or more worms per lamb were recorded duri ...19883354055
immunity in gaigeria pachyscelis infestation. 19714266196
the pathological physiology of gaigeria pachyscelis infestation. 19715162611
use of the enzyme-linked immunosorbent assay in the diagnosis of dictyocaulus filaria infection.the enzyme-linked immunosorbent assay (elisa) was used to detect and quantify antibodies to whole worm extract antigens of dictyocaulus filaria. the results provided evidence that the test was highly sensitive and could be used as a tool for epidemiological studies. no cross reactions were observed with sera from lambs infected with the hookworm gaigeria pachyscelis.19846239341
anthelmintic efficacy of mebendazole suspension against induced helminth infections in south african sheep and cattle.critical controlled tests were performed in 157 sheep (8 experiments) and 34 cattle (2 experiments) to evaluate the anthelmintic activity of mebendazole suspension, administered intraruminally via a stomach tube at a dosage rate of 15 mg of mebendazole/kg of body weight, against induced infections of immature and adult stages of commonly encountered nematode parasites in south africa. in the sheep, the controlled efficacy of mebendazole suspension was good to excellent (90.1% to 100%) against al ...19846375485
isolation and partial characterization of cuticular collagen from the parasitic nematode gaigeria pachyscelis.the cuticle from adult gaigeria pachyscelis was isolated by solubilizing the internal tissues with sodium dodecyl sulphate (sds) at 37 degrees c. cuticular protein was extracted with guanidine-hcl and beta-mercaptoethanol and purified by ammonium sulphate fractionation and deae-cellulose chromatography. sds-polyacrylamide gel electrophoresis of purified protein revealed 2 polypeptides with apparent mol. wts of 58,000 and 74,000. as judged from their hydroxyproline content both of them are collag ...19846745403
oxfendazole: anthelmintic activity in sheep artificially infected with nematodes. results of trials against nine species including benzimidazole-resistant haemonchus a series of 11 trials, in which 281 lambs were artificially infected with 9 species of nematodes, larval anthelmintic tests were carried out to assess the activity of a dose of 5 mg/kg oxfendazole against all 3 parasitic stages of each species. an efficacy of over 99,4% was obtained against all stages of haemonchus contortus, ostertagia circumcincta, trichostrongylus colubriformis, nematodirus spathiger, gaigeria pachyscelis, chabertia ovina and oesophagostomum columbianum with the exception ...19807005443
the residual anthelmintic efficacy of moxidectin against selected nematodes affecting sheep.determination of the residual anthelmintic efficacy in sheep of an oral formulation of moxidectin at a dosage rate of 0.2 mg kg-1 was evaluated 27-29 (mean: 28) d after dosing and that of the injectable formulation of moxidectin at a dosage rate of 0.2 mg kg-1 at 27-29 (mean: 28) and 34-36 (mean: 35) d post-treatment. the injectable formulation was more than 80% effective in more than 80% of treated sheep against a third larval stage challenge of haemonchus contortus, teladorsagia (ostertagia) c ...19947602570
parasite spectrum and seasonal epidemiology of gastrointestinal nematodes of small ruminants in the hundred and four post mortem examinations of randomly selected sheep (52) and goats (52) were carried out weekly from march 1990 to february 1991. gastrointestinal parasites were identified and counted. a large spectrum of 16 helminth species was found in 101 (97%) infected animals. the nematodes infecting small ruminants were, in order of predominance: trichostrongylus colubriformis (96% of all animals), oesophagostomum columbianum (82%), haemonchus contortus (67%), strongyloides papillosus ...19938249251
efficacy of moxidectin against internal parasites of sheep.the efficacy of injectable and oral formulations of moxidectin, at a dosage of 0.2 mg kg -1 live mass was evaluated by the non-parametric method (npm) against the most common internal parasites of sheep in 9 trials involving a total of 201 sheep. both formulations obtained an a classification (more than 80% effective in more than 80% of the treated animals) against the third (l3) and fourth (l4) larval and adult stages of haemonchus contortus, teladorsagia circumcineta, trichostrongylus colubrif ...19938496891
cryopreservation of sheathed third-stage larvae of gaigeria pachyscelis (sandveld hookworm).a technique for the cryopreservation of third stage larvae of gaigeria pachyscelis is described. it consists of incubating sheathed third-stage larvae in 80% (v/v) ethylene glycol as a cryoprotectant for 30 s at 0 degrees c, prior to transfer into liquid nitrogen. the survival rate, as assessed by motility, was 37.6% after 30 d cryopreservation. a sheep infected percutaneously with 700 live cryopreserved third-stage larvae, harboured 41 adult worms (infectivity rate: 5.8%) when necropsied 78 d l ...19958539038
an improved technique for the cryopreservation of gaigeria pachyscelis (sandveld hookworm).a technique for the cryopreservation of third-stage larvae of gaigeria pachyscelis is described. it consists of incubating sheathed infective larvae at 37 degrees c in 40% (v/v) ethylene glycol for 7 min, followed by 2 min at 0 degree c in 82.8% (v/v) cryoprotectant mixture, prior to transferring the larvae to liquid nitrogen. the survival rate obtained with this technique is consistently high: 69.1% as assessed by motility.19958628577
prevalence and seasonal changes in the gastro-intestinal helminths of nigerian goats.a total of 120 gastro-intestinal tracts and 960 faecal samples were examined to assess the prevalence and seasonal changes in the gastro-intestinal helminth parasites of red sokoto (maradi) goats slaughtered at ibadan between may 1991 and april 1992. egg types of strongyles, strongyloides, trichuris, skrjabinema, dicrocoelium and moniezia were encountered in 93%, 83%, 44%, 0.9%, 2.3% and 31% of the faecal samples respectively. however, only strongyle, strongyloides and trichuris eggs occurred in ...19968960229
helminths and bot fly larvae of wild ungulates on a game ranch in central province, zambia.helminths and bot fly larvae were collected from 11 wild ungulate species on a game ranch in the central province of zambia. new host-parasite records are: calicophoron sp. from defassa waterbuck kobus ellipsiprymnus defassa and kafue lechwe kobus leche kafuensis; avitellina centripunctata, gaigeria pachyscelis and gedoelstia cristata from tsessebe damaliscus lunatus lunatus; cooperia rotundispiculum from common reedbuck redunca arundinum; dictyocaulus filaria from greater kudu tragelaphus strep ...19989741058
[epidemiology of gastrointestinal nematodes in small ruminants in the plateau areas in togo].post-mortem helminthological examinations were performed in togo on small ruminants of the djallonké breed (59 sheep, 60 goats), revealing the presence of eight gastrointestinal nematode species which were, in decreasing prevalence order, trichostrongylus sp. (t. axei and t. colubriformis) (99%), haemonchus contortus (82%), strongyloides papillosus (67%), cooperia curticei (43%), oesophagostomum columbianum (40%), gaigeria pachyscelis (36%) and trichuris ovis (4%). the average worm burden was 1, ...19958734228
efficacy of ivermectin against internal parasites of sheep.ivermectin in an oral formulation was evaluated by the non-parametric method against a wide range of endoparasites of sheep in 15 trials involving a total of 297 sheep. ivermectin at 200 micrograms/kg was more than 80% effective in more than 80% of the treated animals (i.e. class a) against induced infestations of 3rd and 4th stage larvae and adults of chabertia ovina, dictyocaulus filaria, haemonchus contortus (including a benzimidazole-resistant strain), nematodirus spathiger, oesophagostomum ...19846549472
the epidemiology of helminthosis in small ruminants under the traditional husbandry system in eastern nigeria.the epidemiology of helminth infections in west african dwarf sheep and goats under the traditional husbandry system prevailing in the derived savanna area of eastern nigeria was studied for 12 months. the infections observed were due to haemonchus contortus (87.1%), trichostrongylus spp. (63.8%), metacestodes of taenia hydatigena (30.2%), oesophagostomum columbianum (22.4%), strongyloides sp. (18.8%), cooperia spp. (17.2%), gaigeria pachyscelis (6.0%), moniezia expansa (6.0%), bunostomum trigon ...19902247944
cryopreservation of the infective larvae of the common nematodes of ruminants.exsheathed infective larvae (l 3) of 19 species of nematodes were tested for infectivity in either sheep or cattle after they had been frozen in 0,9% nacl solution, stored for a relatively short time in the gas phase of liquid nitrogen and subsequently thawed. in addition, 13 of these species were tested after similar storage for up to 18 months. in sheep, haemonchus contortus, ostertagia circumcincta, trichostrongylus axei, trichostrongylus colubriformis, nematodirus spathiger and oesophagostom ...1977566412
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