bluuebunny/crossref_metadata_2025_split huggingface dataset:
Trichostrongylus vitrinus: The influence of age of sheep and population size on the intestinal distribution
Authors: Taylor S. M. , Kilpatrick D. 
Published: June 2009

ABSTRACTTwo age groups of parasite-free lambs, 4 months and 8 months, were infected with 50 000 infective larvae (L3) of T. vitrinus. A further group of 8 month old lambs were infected with 250 000 L3 T. vitrinus. The lambs were slaughtered at intervals after infection, and the size and linear distribution of their intestinal worm burdens examined and compared statistically. After the 50 000 L3 infections, it was found that a higher percentage of the initial inoculum had become established in the younger lambs but that there were no differences between the intestinal distributions of the population in either age group.After infection with 250 000 L3, the percentage of the larvae retained changed with time. Up to sixteen days post infection, 38% of the larvae administered were retained; thereafter the percentage fell to 22%. The linear distribution of the population in this size of infection showed that a significantly greater percentage was present between 4.8 and 7.2 metres distal to the pylorus when compared with that after infection with 50 000 L3.
A new nematode Neocamallanus bareilliensis from a piscine host Channa punctatus Bloch
Authors: Sharma R. K. , Sharma P. K. 
Published: June 2009

ABSTRACTNeocamallanus bareilliensis n. sp. has been described from the intestine of a freshwater fish Channa punctatus from Bareilly (U. P.) India. It has been distinguished from the other three species of the genus reported so far.
A description of adult Wuchereria bancrofti (rural strain) from an experimental infection in the long-tailed macaque, Macaca fascicularis (Syn. M. irus)
Authors: Dissanaike A. S. , Mak J. W. 
Published: June 2009

ABSTRACTAdult worms of the rural strain of Wuchereria bancrofti in Peninsular Malaysia obtained from a successful experimental transmission in an immunosuppressed Macaca fascicularis are described for the first time. Although the worms, especially females, were slightly smaller, they were similar in morphology to those of the periodic and non-periodic W. bancrofti previously described.
Nilocotyle duplicisphinctris sp. n. (Trematoda: Paramphistomidae) from Hippopotamus amphibius
Authors: Sey O. , Graber M. 
Published: June 2009

ABSTRACTNilocotyle duplicisphinctris sp. n. was recovered from the stomach of Hippopotamus amphibius in Ethiopia. The average body size (L × W) is 3.6 × 1.2 mm; pharynx 0.5 × 0.3, Dicranocoelium type; other diameter of the acetabulum 0.85, Nilocotyle type; anterior testis 0.34 × 0.49; posterior testis 0.32 × 0.27; ovary 0.27 × 0.19; genital opening 0.30 × 0.34, Duplicis phinctris type and eggs 0.15 × 0.07. The most characteristic specific feature is the presence of a double sphincter along the genital atrium.
The effect of gamma irradiation on Nematospiroides dubius. Factors affecting the survival of worms in a primary infection in mice
Authors: Behnke Jerzy M. , Parish Heather A. , Hagan Paul 
Published: June 2009

ABSTRACTThe infective larvae of Nematospiroides dubius were exposed to various levels (0–30 krad) of gamma irradiation by means of a Cobalt 60 source. Groups of mice were infected with these larvae and autopsied 5 weeks later for worm counts. It was found that male worms were more susceptible to irradiation than female worms. In both instances, however, the survival curve on a semi logarithmic plot was characterised by a shoulder at low doses and an exponential component at the higher levels of exposure. No male worms were recovered from mice infected with larvae given more than 12 krad but some female worms were capable of surviving 20 krad. The fecundity of female worms was reduced by 61% at 4 krad and totally ablated at 8 krad.Further experiments demonstrated that the survival of irradiated N. dubius in vivo was related to the extent of the damage caused at the time of irradiation and was not dependant on additional host parameters. Thus neither the number of irradiated worms inoculated nor the sex of the host radically altered the sex ratio or proportion of the worms lost as a result of irradiating the larvae. Furthermore, treatment with cortisone or sublethal irradiation of the host did not increase the proportion of surviving worms. It was, therefore, concluded that a host immune response was not involved.
Opisthorchis viverrini:Partial success in adoptively transferring immunity with spleen cells and serum in the hamster
Authors: Flavell D. J. , Pattanapanyasat K. , Flavell Sopsamornu U. 
Published: June 2009

ABSTRACTThree groups of golden Syrian hamsters received intraperitoneally either, (1) 1 × 107spleen cells, (2) 0.5 ml. serum or, (3) 1 × 107spleen cells plus 0.5 ml. serum, from donors infected 6 weeks previously with 25Opisthorchis viverrinimetacercariae, one day before and at the same time as challenge with 25 metacercariae. Three groups of control animals received the same quantities of spleen cells, serum or an admixture of both from normal non-infected donors in the same manner followed by challenge with 25 metacercariae.Animals were killed six weeks after challenge, livers and extrahepatic biliary systems carefully removed, and liver worm burdens estimated. Additionally, parasitic egg counts were performed on pooled faeces samples collected one hour prior to death.Animals receiving spleen cells, serum, or an admixture of both, from normal non-infected donors had mean worm burdens of 11.44, 12.00 and 12.66, respectively. Animals receiving spleen cells, serum, or both, from infected donors had mean worm burdens of 9.88, 7.77 and 12.00, respectively. There were no significant differences in mean worm burdens between control and experimental groups. However, a substanial reduction in parasitic faecal egg counts and subsequently mean egg production per worm was observed in all 3 groups of animals receiving spleen cells, serum, or both, from infected donors when compared to their respective control group.These findings are discussed in relation to adoptive transfer studies performed with other helminths and their possible relevance to naturally acquired immunity is commented on.
Castroia kamariae sp. nov. and Limatulum kuziai sp. nov. (Lecithodendriidae) from the free-tailed bat (Tadarida mops de Blainville) from West Malaysia
Authors: Palmieri James R. , Krishnasamy M. , Sullivan John T. 
Published: June 2009

ABSTRACTThirteen bats, Tadarida mops de Blainville, collected from the Ampang district in Kuala Lumpur, Malaysia, were found positive for the trematodes Castroia kamariae sp. nov. and Limatulum kuziai sp. nov. Two distinct but morphologically similar forms of Castroia kamariae were recovered. The morphological type is apparently determined by its location in the host intestine.
Taeniasis, cysticercosis and echinococcosis/hydatidosis in Nigeria: II — prevalence of bovine and porcine cysticercosis, and hydatid disease in slaughtered food animals based on retrospective analysis of abattoir records
Authors: Dada B. J. O. 
Published: June 2009

AbstractA retrospective analysis of slaughterhouse records during the pre-veterinary-organized meat inspection era (before 1970) for cysticercosis and hydatidosis in food animals showed that parasitic cysts were documented but not identified and that the numbers of slaughtered animal species harbouring various parasitic cysts were not recorded. Since the various parasites which the meat inspectors observed were not identified, the prevalence of species encountered could not be determined.An analysis of abattoir records during the veterinary meat inspection era showed that Cysticercus bovis and C. cellulosae infections were documented in cattle and pigs respectively. Moreover, hydatid cysts were detected in cattle, pigs, sheep, goats and camels.The data obtained from this survey cannot be wholly relied upon as accurate, but it can be used as a baseline for the proper evaluation of the status of these zoonotic parasitic diseases in future co-ordinated researches.
Helminth parasites of wild cats in north-east Scotland
Authors: Burt M. D. B. , Pike A. W , Corbett L. K 
Published: June 2009

AbstractThree cestode species, namelyTaenia taeniaeformisBatsch, 1786,Taenia pisiformis(Bloch, 1780) andMesocestoides litteratus(Batsch, 1786) and one nematode species,Toxocara catiSchrank, 1788, were found in wild cats collected in Grampian region, Scotland. Of the 41 cats examined, 25 wereFelis silvestris, 12 were feralFelis catusand four were hybrids ofF. silvestrisandF. catus.
Ascaridoid nematodes of Sirenians—the Heterocheilinae redefined
Authors: Sprent J. F. A. 
Published: June 2009

AbstractThe two ascaridoids of sirenians, Heterocheilus tunicatus Diesing, 1839, and Paradujardinia halicoris (Owen, 1833), are redescribed. A basic affinity between the two species is indicated in the bilateral structure of the excretory system, the globular ventriculus, long intestinal caecum, and the form of the male tail. The subfamily Heterocheilinae is redefined so as to contain these two genera. It is proposed that the subfamily comprises a natural suprageneric group within the Ascarididae sensu Hartwich, 1974 containing, in addition to Heterocheilus and Paradujardinia, the following genera occurring in freshwater, estuarine and coastal vertebrates: Multicaecum Baylis, 1923; Dujardinascaris Baylis, 1947; Gedoelstascaris Sprent, 1978; Ortleppascaris Sprent, 1978; Brevimulticaecum Mozgovoy sensu Sprent, 1979; Krefftascaris Sprent, 1980. The suggestion is made that the ascaridoids of sirenians originated from forms in fluviatile lower vertebrates.
Revision of the genera Longistrongylus Le Roux 1931, Kobusinema Ortlepp, 1963 and Bigalkenema Ortlepp, 1963 (Nematoda: Trichostrongylidae)
Authors: Gibbons Lynda M. 
Published: June 2009

ABSTRACTThe species of the genera Longistrongylus, Kobusinema and Bigalkenema are redescribed. Kobusinema and Bigalkenema are considered synonyms of Longistrongylus and their species are transferred as new combinations. Bigalkenema neveulemairei (Gutteres, 1947) Jansen, 1958 and Longistrongylus muraschkinzevi (Shulz and Kadenatsii, 1950), Jansen, 1958 are considered species inquirendae. A key to the species of the genus Longistrongylus is given and their hosts and geographical localities are listed.
Studies on the mechanism of lysis ofEchinococcus granulosusprotoscoleces incubated in normal serum
Authors: Rickard M. D. , Mackinlay L. M. , Kane G. J. , Matossian R. M. , Smyth J. D. 
Published: June 2009

ABSTRACTBrood capsules were obtained from freshly collected cysts of equine and ovine strains ofEchinococcus granulosus. Protoscoleces were freed from brood capsules either by mechanical disruption or pepsin-HCl digestion. Preparations of protoscoleces studied included: mechanically released protoscoleces without further treatment, or incubated either in HCl pH 2·0 or in evaginating solution (containing Na taurocholate) for 24 h; pepsin-HCl released protoscoleces without further treatment or incubated in evaginating solution for 24 h or 7 days. Half of each preparation of ovine protoscoleces was fixed in absolute methanol.All fresh preparations of protoscoleces lysed rapidly when incubated in normal human serum. Studies with a fluorescein isothiocyanate (FITC) labelled sheep anti-human C3antiserum revealed the presence of C3on the surface of lysing protoscoleces. Antibody could not be detected on the surface of any of the preparations of fresh or methanol-fixed protoscoleces using direct or indirect fluorescent antibody tests suggesting that the classical pathway of complement activation was not involved in the lytic process. Strong evidence for lysis by the alternate pathway of complement activation was the lysis of protoscoleces which had been treated with pepsin-HCl and lysis of protoscoleces in guinea-pig serum deficient in C4component of complement.
The fate of Fasciola hepatica metacercariae following challenge infection of immune rats
Authors: Rajasekariah G. R. , Howell M. J. 
Published: June 2009

ABSTRACTGroups of rats, infected 7 weeks previously with Fasciola hepatica, together with appropriate control groups, were challenged either orally or intraperitoneally with 30 metacercariae. The mean worm recovery from the previously infected, orally challenged rats was significantly lower than from their respective controls (2.2 ± 1.1 worms as opposed to 9.0 ± 2.6). There was no significant difference in mean worm recovery from the previously infected, intraperitoneally challenged rats and their respective controls (5.3 ± 3.2 worms as opposed to 6.2 ± 1.9). Livers of the orally challenged group appeared to be largely free from secondary damage but considerable damage was evident in rats which received an intraperitioneal challenge. This evidence supports the view that the gut acts as an important barrier to metacercariae of a challenge infection. In a further experiment, young flukes were recovered from the gut, abdominal cavity and liver of immune and control rats 9, 18, 27, 36 and 45 h after oral challenge. It was found that fewer flukes successfuly penetrated the guts of immune rats (3%) than those of uninfected controls (13%), again pointing to the gut as a barrier to metacercariae of a challenge infection. Protective mechanisms that may oprate at the level of the gut are discussed.
Monanema nilotican.sp. (Nematoda: Onchocercidae) a cardiopulmonary parasite of the Nile rat in Sudan
Authors: Elbihari Sabir , Hussein Hussein S. , Muller Ralph 
Published: June 2009

ABSTRACTMonanema nilotican.sp. (Nematoda: Onchocercidae) is described from the right auricle and pulmonary artery of the Nile rat,Arvicanthis niloticus testicularis(Sundevall, 1842), trapped in Khartoum-North, Sudan. It differs from other species principally in length of adults and microfilariae, in the shape of the buccal capsule and in the structure of the spicules of the males.
Modification of the pathogenicity of Schistosoma mattheei for sheep by passage of the parasite in hamsters
Authors: Taylor M. G. , James E. R. , Nelson G. S. , Bickle Q. , Dunne D. W. , Dobinson A. R. , Dargie J. D. , Berry C. I. , Hussein M. F. 
Published: June 2009

ABSTRACTBorder Leicester X Suffolk sheep infected with a strain of S. mattheei maintained in hamsters do not develop the same pathological changes as Romney Marsh sheep infected with the same strain of parasite before hamster passage. To determine the cause of this reduced pathogenicity, five Romney Marsh sheep were each infected with 10 000 cercariae of the hamster-passaged parasite and five with 10 000 cercariae of a S. mattheei strain from Onderstepoort, South Africa, passaged exclusively through sheep.Striking pathological and parasitological differences were found between the two strains. Infection with the “sheep” strain was lethal, whereas infection with the “hamster” strain produced little evidence of clinical disease. By 13 weeks post-infection the mean body weight of the sheep infected with the sheep strain had declined by 15% compared with both the uninfected controls and the sheep infected with the hamster strain, and the mean PCV was lowered to 20% in the sheep strain infected animals. Egg production began at seven weeks with the sheep strain, faecal counts rising to more than 300 e.p.g., whereas only two of the sheep infected with the hamster strain passed eggs in the faeces (at nine weeks) and the maximum egg count was 50 e.p.g. Twice as many adult worms of the sheep strain were recovered, and, although the number of eggs found in the tissues “per worm pair” was not significantly different, overall egg production was higher for the sheep strain; also more of the sheep strain eggs were deposited in the intestines. Similar parasite differences were seen in a supplementary study in mice and it seemed that “attenuation” of the parasite had occurred, presumably due to its maintenance in hamsters. Histopathological observations and faecal egg counts both indicated an inability of hamster strain eggs to penetrate the intestinal lumen; this was probably important in reducing the pathogenicity of the hamster strain.
Moniezia expansa: the interproglottidal glands and their Secretions
Authors: Gunn A. , Probert A. J. 
Published: June 2009

AbstractAcerylcholinesterase (EC 3:1:1:7) and alkaline phoshatase (EC 3:1:3:1) were detected in secretions of Moniezia expansa maintained in vitro. Ultrastructural cytochemical studies demonstrated acetylcholinesterase activity on the surface of the microtriches at the base of the interproglittidal glands and in the gland lumen but not in the distal tegument or the gland cells. Alkaline phoshatase activity was demonstrated in the cytoplasm of the gland cells and especially in their protoplasmic connections with the distal tegument. Activity was also found in the distal tegument and the microtriches. It is suggested that the acetylcholinesterase secreted by M. expansa performs a metabolic role at the worms's surface.
The suppression of homologous immunity by soluble adult antigens of Nematospiroides dubius
Authors: Pritchard D. I. , Behnke J. M. 
Published: June 2009

ABSTRACTAn established adult infection of Nematospiroides dubius was unaffected by the administration of immune lymphocytes and immune sera whereas an incoming larval infection was expelled. Past experiments have shown that the immune inoculum at least had the ability to recognize adult stages, leading to the hypothesis that adult stages secrete or excrete an immunomodulatory shield around themselves in the gastrointestinal tract. This hypothesis was given further credence by the demonstration that soluble antigens derived from adults abolished the generation of homologous immunity to this parasite. Modulation of immunity was reflected by increased fecundity, increased worm size, and increased survival time in the gut.
The life-cycle of Syphacia muris Yamaguti (Nematoda: Oxyuroidea) in the laboratory rat
Authors: Lewis J. W. , D'silva J. 
Published: June 2009

AbstractThe life-cycle of Syphacia muris is described in primary infections of Wistar rats. The life-cycle of S. muris is completed within seven days and no moults were discovered inside the egg. Instead each of two moults were observed outside the egg up to 24 and 40 hours after infection, and TEM studies suggest a third moult occurs up to 64 hours. The development and maturation of the larval stages are described for the first time using both light and electron microscopy. Differences in the size and growth of female S. muris compared with previously published figures could be due to differences in the strains of rats used.
Attempted vaccination of jirds (Meriones unguiculatus) againstBrugia pahangiwith radiation attenuated infective larvae
Authors: Chusattayanond W. , Denham D. A. 
Published: June 2009

ABSTRACTJirds were vaccinated by three to five subcutaneous (SC) injections of infective larvae ofBrugia pahangiwhich had been irradiated at 25, 45 or 90 krads from a60Co source. They were challenged either SC or intraperitoneally. Vaccination with four doses of 50 larvae irradiated with 25 krads produced 49·3% resistance to IP challenge worms and 39·8% against SC challenge worms. Five doses of larvae irradiated with 45 krads produced 62% resistance to SC challenge. Three doses of larvae irradiated with 90 krads produced 74·9% resistance to SC challenge and five doses produced 76·2% resistance. The reasons why irradiated larvae produce resistance whereas normal larvae do not are discussed.
Optimization of culture conditions for the maintenance of Onchocerca gutturosa adult worms in vitro
Authors: Townson Simon , Connelly C. , Muller R. 
Published: June 2009

ABSTRACTA series of experiments examined the effects of various media, serum supplements, gas phases and the incorporation of mammalian cell feeder layers on the survival on Onchocerca gutturosa adult worms in vitro. The survival of male worms was poor in all media tested that were not supplemented with inactivated foetal calf serum (IFCS), with improved but variable survival in media supplemented with 10–30% IFCS. Using a cell-free system in an atmosphere of 5% CO2in air, good results were obtained in medium NCTC 135 + 10% IFCS (median survival time 39 days, range 25–41). Marginally better survival was obtained with the same medium in an atmosphere of 95% N2/5% CO2 (medium 45 days, range 25–56)and with a 1:1 mixture of media NCTC 135 and IMDM+10% IFCS(medium 38 days, range 38–51). Survival was enhanced in culture systems which incorporated bovine kindney (MDBK) cells, bovine trachea (EBTR) cells and monkey kidney (LLCMK2) cells. Exceptionally long survival was obtained using medium MEM+10% IFCS+LLCMK2 cells under a gas phase of 5% CO2in air, in which male worms survived from approximately 6 to over 7 months. Under similar conditions, female worms were also maintained for periods of up to 6 months and 5 out of 18 specimens released microfilariae into the culture system. The long-term culture described in this study will be useful for basic biochemical, chemotherapeutic and immunological studies in vitro.
Leukocyte accumulation in sparganosis: further characterization of an eosinophil chemotactic factor of the plerocercoid ofSpirometra erinacei
Authors: Horii Y. , Owhashi M. , Ishii A. , Fujita K. 
Published: June 2009

ABSTRACTAn eosinophil chemotactic factor (ECF) was partially purified from plerocercoids ofSpirometra erinaceiby a combination of anion-exchange chromatography on DE52 and gel filtration on Sephacryl S–200. The molecular weight of ECF was estimated to be 25 000–45 000 by high-pressure liquid chromatography. The ECF was bound with concanavalin A-Sepharose. The ECF was sensitive to periodate oxidation and to heating (56°C, 30 min). On isoelectric focusing, eosinophil chemotactic activity was clearly revealed at pI 4·1. These results suggest that ECF ofS. erinaceiplerocercoid is an acidic glycoprotein. An intradermal injection of ECF induced eosinophil attractions in the normal guinea pig skin.
Observations on the suitability and importance of the domestic intermediate hosts of Echinococcus granulosus in Uttah Pradesh, India
Authors: Irshadullah M. , Nizami W. A. , Macpherson C. N. L. 
Published: June 2009

ABSTRACTThe present study investigated the suitability and importance of buffaloes, camels, sheep, goats and pigs in maintaining the life-cycle of Echinococcus granulosus in Aligarh, India. A total of 565 (36%) of 1556 buffaloes, 20 (2%) of 1208 goats, 5 (1%) of 559 pigs, 6 (6%) of 109 sheep and two of three camels were found to harbour hydatid cysts. The frequency distribution of the hydatid cysts in each intermediate host species was over-dispersed and in buffaloes cyst fertility increased with increasing cyst size. Of 2171, 95 and four buffalo, goat, and camel cysts examined 327 (15%), two (2%) and three cysts respectively were fertile. No pig or sheep cysts were found to contain protoscoleces. The unfenced buffalo abattoir and the large number of dogs allowed access to the abattoir coupled to the number of buffaloes slaughtered in comparison to the other potential hosts, indicates that the buffalo is the most significant host for maintaining the life-cycle of the parasite in this area of India. Applicable control measures for the region are suggested.
Experimental Brugia pahangi and B. malayi infections of callitrichid primates
Authors: Denham D. A. , Suswillo R. R. , Hetherington C. M. 
Published: June 2009

ABSTRACTThe callitrichid primates, Callithrix jacchus jacchus (the marmoset) and Saguinus labiatus (the tamarin) were inoculated with infective larvae of Brugia malayi and B. pahangi. Microfilaraemia at low levels developed in 3 out of 4 C. j. jacchus infected with B. malayi and living or dead adult worms found in all 4. Only one of 4 C. j. jacchus became microfilaraemic (mf + ve) when given B. pahangi and adults were found in two. Of 4 S. labiatus given B. pahangi one became very lightly mf + ve and adults were found in 3. It is concluded that these animals are not suitable hosts for chemotherapeutic experiments.