PubMed Health⌕ Search

Biomedical subjects

I Beveridge

Publications and source records attributed to I Beveridge.

At least 109 records · Page 6Linked to original sources
PubMed1985

Biochemical differentiation in bile duct cestodes and their marsupial hosts.

Isozyme electrophoresis was used to assess possible cospeciation of parasites (cestodes of the Progamotaenia festiva complex) and their hosts (Australian diprotodont marsupials) and to compare the extent of interspecific genetic diversity of the parasites and their hosts. On the basis of morphology, there are three species in the complex, although electrophoresis revealed 14 distinct genetic types, most of which were host specific, although there were three cases of apparent host switching. The evolutionary relationships among the parasites were only partially concordant with those among the hosts. Moreover, the extent of electrophoretic diversity among the parasites was much higher than that among hosts.

Animals↗
PubMed1985

Parasites and associated pathology of the swamp wallaby, Wallabia bicolor (Marsupialia).

Thirty-five swamp wallabies from Victoria, New South Wales and Queensland, Australia were examined for parasites. Thirty-nine species of nematodes, five species of cestodes and eight species of arthropods were found. Wallabies from Queensland and northern New South Wales had a less diverse helminth fauna (23 species) than did wallabies from southern New South Wales and Victoria (32 species). Rugopharynx spp. and Cloacina spp. occurred in large numbers in the stomach but provoked no pathological changes. Known pathogenic species (Globocephaloides trifidospicularis and Hypodontus macropi) were encountered in small numbers only and did not produce any lesions. Pathological changes associated with parasites were: gastric nodules associated with Labiostrongylus clelandi and Parazoniolaimus collaris, bronchopneumonia due to Marsupostrongylus spp., biliary fibrosis associated with Progamotaenia festiva and fibrous peritonitis, pleuritis, pericarditis and eosinophilic splenitis due to Breinlia mundayi. Echinococcus granulosus was the only parasite found which also occurs in domestic animals.

Animals↗
PubMed1983

Morphogenesis of Trichostrongylus rugatus and distribution during development in sheep.

Morphogenesis of Trichostrongylus rugatus was examined in 16 sheep experimentally-infected with 120 000 third-stage larvae and killed 2, 4, 6, 8, 10, 12, 16 and 20 days later (DAI). Third stage larvae moulted between Days 4 and 6, and fourth stage larvae moulted on Day 10 after infection. Four sheep first passed eggs in the faeces between Days 16 and 18 after infection. Rate of growth of larvae was constant between 2 and 10 DAI followed by a period of rapid growth from 10 to 16 DAI. Major features of larval development are described. Nematodes were largely restricted to the first 6 m of gut with 71% of worms occurring in the first 3 m.

Abomasum↗
PubMed1983

Development of villus atrophy in the small intestine of sheep infected with Trichostrongylus rugatus.

Pairs of sheep infected with 120 000 larvae of Trichostrongylus rugatus were killed at intervals from 2 to 56 days after infection (DAI). Worms were located in tunnels in the epithelium of villi or upper intestinal crypts at all stages of development. Villus atrophy developed progressively until 16 DAI, when surface microtopography, characterised by subtotal villus atrophy, stabilised. Most severe lesions were in the first 3 m of small intestine where the density of nematodes was highest. Discontinuities in the epithelium and effusion of inflammatory cells and tissue fluids into the lumen were rare. No effects of infection on body-weight gain, appetite or serum total protein and albumin were evident in the first 20 days of infection. However, it was concluded that T. rugatus fundamentally resembled T. colubriformis and T. vitrinus in the response it elicited in the intestine of sheep, and must be considered potentially pathogenic.

Animals↗
PubMed1982

The trichostrongyloid parasites of sheep in South Australia and their regional distribution.

The species of trichostrongyloid nematodes present in 376 sheep from different agricultural regions of the state of South Australia were determined. Parasites encountered in the abomasum were Teladorsagia circumcincta, T. trifurcata, T. davtiani, Camelostrongylus mentulatus, Haemonchus contortus and Trichostrongylus axei. T. circumcincta was the species most commonly encountered, but C. mentulatus was widespread in arid areas. H. contortus was present in a small number of sheep only, mainly in southern areas. In the small intestine, Trichostrongylus vitrinus predominated in the wetter, southern districts, and T. rugatus in dry, northern areas. T. colubriformis was common, but was rarely dominant. T. probolurus was found in one sheep. Nematodirus filicollis was restricted to wetter, southern areas, while N. spathiger and N. abnormalis were widespread and predominated in dry areas. N. helvetianus was found once. Cooperia species were uncommon; species encountered were C. oncophora, C. surnabada and C. pectinata.

Abomasum↗
PubMed1981

[Peramelistrongylus Mawson, 1960 and Profilarinema n. gen., trichostrongyloid nematodes apparently transitional between the Strongyloidea and the atypical genus Filarinema Mönnig, 1929 (author's transl)].

Peramelistrongylus skedastos Mawson, 1960, type species of the genus Peramelistrongylus Mawson, 1960 is redescribed. Also described is Profilarinema hemsleyi n. gen., n. sp. from Trichosurus vulpecula in Western Australia. The new genus, which is similar to Filarinema, differs from it essentially by the absence of the complex buccal armature which characterizes the latter genus. The genera Batrachostrongylus Yuen, 1963, parasitic in amphibians, Peramelistromgylus, parasitic in perameloid and dasyuroid marsupials, Profilarinema parasitic in phalangerid marsupials and Filarinema Mönnig, 1929, parasitic in macropodid marsupials, seem to us to constitute a homogeneous evolutionary line distinct from the other Australian trichostrongyloids.

Animals↗
PubMed1981

[Description of Zaglonema zaglossi n. gen., n. sp., and Z., ewersi, n. sp., (Nematoda: Trichostrongyloidea) parasitic in the intestine of Zaglossus bruynii in New Guinea (author's transl)].

The new genus Zaglonema is characterised by the presence of primitive cephalic features, a poorly developed synlophe, the presence of a cervical groove, extra branches of the dorsal ray, short spicules and the absence of a spike on the tail of the female. Many of these features distinguish the new genus from the 3 other genera of Trichostrongyloid Nematodes occurring in Monotremes. The new genus appears to have some affinities with the genus Mackerrastrongylus which occurs in perameloid marsupials.

Animals↗
PubMed1980

Observations on Onchocerca gibsoni and nodule development in naturally-infected cattle in Australia.

O. gibsoni worms were extracted from 185 nodules of a total of 370 worm nodules collected from 94 naturally infected cattle at Townsville, Australia. 183 of the 185 nodules contained a single female worm, 60% of them contained a single male worm and 7% contained two male worms. Nodules containing males alone were not found. Small nodules (less than 0.2 g) contained immature female worms without microfilariae and no males. As nodule size and female worm size increased, the number of female worms with microfilariae and the number of nodules with males increased reaching almost 100% in nodules weighing greater than 3.0 g. It is suggested that female worms normally become encapsulated when young, grow within the nodule and tht the male enters the nodule later, fertilises the female and remains in the nodule.

Animals↗
PubMed1980

Experimental infection of laboratory rodents and calves with microfilariae of Onchocerca gibsoni.

Uterine microfilariae of Onchocerca gibsoni migrated to skin of all parts of the body when inoculated into rats and mice. Higher microfilarial densities were obtained in the skin of mice compared with rats. In guinea pigs very few microfilariae migrated to the skin and densities of microfilariae were very low. Densities of skin microfilariae were lower in rats when inoculated intraperitoneally compared with inoculation by 2 subcutaneous routes. In the latter case, higher densities of microfilariae were obtained in areas of skin closer to the injection sites. Persistence of microfilariae in the skin of rats was variable but only low numbers were recovered between 21 and 70 days after infection. Microfilariae also migrated to the skin in calves experimentally infected by subcutaneous injection into the dewlap. Microfilaria were recovered consistently and in high numbers from skin snips along the ventral midline. Small numbers of microfilariae were occasionally found in skin snips from the dorsal midline.

Animals↗
PubMed1979

The anoplocephalid cestode parasites of the spectacled hare-wallaby Lagorchestes conspicillatus Gould, 1842 (Marsupialia: Macropodidae).

Progamotaenia gynandrolinearis sp. nov. is described from the small intestine of Lagorchestes conspicillatus Gould, 1842 from Barrow I., Western Australia. It is distinguished from other species by the small number of testes arranged in a single transverse row. Progamotaenia lagorchestis (Lewis, 1914) is redescribed. The name Progamotaenia thylogale sp. nov. is proposed for a second species described previously under the name P. lagorchestis. Progamotaenia zschokkei (Janicki, 1905), Progamotaenia festiva (Rudolphi, 1819) and Progamotaenia villosa (Lewis, 1914) were also found in L. conspicillatus.

Animals↗