| diagnosis of schistosoma bovis infection in cattle by an indirect haemagglutination test. | an indirect haemagglutination test has been developed for the detection of schistosoma bovis antibody. fresh, formalin and glutaraldehyde fixed sheep erythrocytes as well as fresh and formalin fixed human erythrocytes were tested. tanned glutaraldehyde fixed sheep erythrocytes sensitized with an adult worm extract were the most sensitive and remained stable for at least 8 weeks at 4 degrees c. with such cells 98% of a group of s. bovis infected cattle were positive while negative results were ob ... | 1975 | 236339 |
| the serodiagnosis of chronic fascioliasis (fasciola gigantica) using a fluorescent-antibody technique with single and multiple whole-fluke antigens. | sera from cattle with single or mixed infections of fasciola gigantica. dicrocoelium hospes, schistosoma bovis and paramphistomes were examined for fluorescent antibodies. cross-reacting antibodies of the heterologous flukes were easily detected by using cryostat sections with whole-fluke-antigen of all three flukes. the presence of f. gigantica antibodies in a cattle herd was tested at two monthly intervals in order to establish the occurrence of chronic fascioliasis. the lack of significant di ... | 1979 | 384628 |
| immunization of sheep against schistosoma bovis using an irradiated schistosomular vaccine. | | 1979 | 458126 |
| scanning electron microscopy of the integumental surfaces of schistosoma bovis. | | 1979 | 479543 |
| studies of the relationships between schistosoma and their intermediate hosts. iv. the genus bulinus and schistosoma bovis from morocco. | schistosoma bovis from morocco was used in infection experiments with several populations of bulinus truncatus. the snails from libya, malawi, morocco and senegal were very compatible with the schistosome since the infection rates were approximately 90%, the mortality was low, and a very high production of cercariae, approximately 1.2 million per 100 exposed snails, was observed. only a very few b. truncatus (2n = 36) from rhodesia became infected. b. permembranaceus and b. forskalii were refrac ... | 1979 | 541499 |
| the in vivo development of schistosoma bovis in the nile rat. | the in vivo development of the sudanese strain of schistosoma bovis in the nile rat, arvicanthus niloticus is described. six stages in development are distinguished: the 'lung form' (stage 1), attaining maximum numbers on day 5 post-infection; the 'closed-gut form' (stage 2) on day 14, characterized by the union of the gut caeca behind the ventral sucker; 'organogeny' (stage 3) on day 17, the male possessing one testis and a gynaecophoric canal and the female a narrow uterus; 'gametogeny' (stage ... | 1978 | 666394 |
| observations on some isoenzymes of strains of schistosoma bovis; s. mattheei, s. margrebowiei, and s. leiperi. | | 1978 | 726559 |
| immunization of calves against schistosoma bovis using irradiated cercariae of schistosomula of s. bovis. | | 1978 | 748838 |
| initial fractionation of adult schistosoma bovis antigen for diagnosis of infection in cattle. | initial work on the fractionation of schistosoma bovis adult worms is described. both male and female worms were homogenized and sonicated before being passed through sephadex g200. five peaks were obtained with male fractionation (designed m1 to m5) and four with female (designated f1 and f4). using the complement fixation test s. bovis antigen activity was detected primarily in peaks m1 and f1. with the indirect haemagglutination and indirect haemagglutination inhibition tests s. bovis antigen ... | 1975 | 805168 |
| studies on schistosoma bovis in ethiopia. | schistosoma bovis occurs in at least seven of the 14 rovinces of ethiopia. results of faecal and snail surveys in three foci are reported. adwa. one collection showed that nine out of 26 bulinids were infected with s. bovis. the snail host was a tetraploid form of bulinus (n = 36). the examination of 200 specimens of cattle faces revealed no s. bovis eggs, which was attributed to poor technique or light infection. gewani. the snail host was bulinus abyssinicus, which was also infected with s. ha ... | 1975 | 808181 |
| laboratory investigations on natural infection in zebu cattle with fasciola gigantica and schistosoma bovis. | | 1977 | 835347 |
| susceptibility of planorbarius metidjensis from portugal and spain to schistosoma bovis from salamanca, spain. | the susceptibility of planorbarius metidjensis from portugal and salamanca (spain) to schistosoma bovis from salamanca was studied. the degree of susceptibility as measured by positivity rate, number of cercariae, pre-patent period and survival rate, showed that p. metidjensis from portugal and spain are very susceptible to s. bovis from salamanca. the role of p. metidjensis as a host of s. haematobium is questioned and further studies are shown to be necessary. to determine if the disease exist ... | 1977 | 904368 |
| letter: spurious human infections with schistosoma bovis. | | 1976 | 960204 |
| the pathology of experimental schistosoma bovis infection in sheep. | five desert sheep were exposed to 5000 or 10000 schistosoma bovis cercariae each, and the parasitological clinical and pathological parameters were recorded. the pre-patent period was approximately 7 weeks and from that time onwards, the animals became progressively ill and emaciated. following necropsy at the 12th week, a percentage schistosome recovery ranging from 36%--63.6% was found, and there were high egg densities in the intestinal tract and the liver. these organs revealed severe pathol ... | 1976 | 1010922 |
| the pathology of naturally-occurring bovine schistosomiasis in the sudan. | the gross and histopathological lesions of naturally-occurring bovine schistosomiasis in the sudan are detailed. out of 61 animals examined, 53 were found infected with schistosoma bovis, showing lesions in their livers, intestinal tracts and other organs. apart from granulomas, periportal inflammatory infiltration, fibrosis and pigmentation of kupffer cells, livers of infected cattle revealed peculiar lesions in the form of "nodular sclerosis", medial hypertrophy of portal veins and lymphoid no ... | 1975 | 1155988 |
| the intermediate hosts of schistosoma bovis in western kenya. | | 1975 | 1179468 |
| schistosoma mansoni: control of hepatotoxicity and egg excretion by immune serum in infected immunosuppressed mice is schistosome species-specific, but not s. mansoni strain-specific. | immunosuppressed mice infected with schistosoma mansoni suffer from an acute hepatotoxicity reaction, and they fail to excrete as many parasite eggs as comparably infected immunologically intact control animals. the hepatotoxicity was shown here to be preventable, and egg excretion rates were enhanced, by transfer of serum from donors with chronic s. mansoni infections, but not by serum from donors with heterologous infections of schistosoma haematobium, schistosoma bovis, or schistosoma japonic ... | 1992 | 1426135 |
| inter-species variation of schistosome 28-kda glutathione s-transferases. | the 28-kda glutathione s-transferase from schistosoma mansoni (sm28gst) is a candidate vaccine antigen. to evaluate the antigenic and phylogenetic variations between the 28-kda gsts from 4 species of schistosome, we have cloned and sequenced the 28-kda gsts from schistosoma haematobium (sh28gst) and schistosoma bovis (sb28gst). sb28gst and sh28gst are more similar to each other (97%) than to sm28gst (90%) and particularly to the 28-kda gst from schistosoma japonicum (sj28gst, 77%). antisera dire ... | 1992 | 1518533 |
| pattern of cercarial emergence of schistosoma curassoni from niger and comparison with three sympatric species of schistosomes. | the emergence pattern of schistosoma curassoni cercariae from bulinus umbilicatus, whose adult worms parasitize bovine, caprine, and ovine ungulates in niger, is of a circadian type with a mean emission time at 0855 hr +/- 1 hr 6 min, characteristic of the schistosome species parasitizing domestic or wild cattle. the comparison of this cercarial emergence pattern with those of the other 3 sympatric species of schistosomes (schistosoma haematobium, schistosoma bovis, and schistosoma mansoni) show ... | 1992 | 1738069 |
| [main features of helminth parasitism in cattle in ituri (haut-zaire). iii. geographic distribution and prevalence of the main helminths]. | a necropsic survey, carried out in eleven slaughterhouses in ituri (haut-zaïre), has permitted to define the geographic distribution and prevalences of the main cattle helminths. trematodes, except the paramphistomes, had a very heterogeneous distribution. prevalence of fasciola gigantica ranged from 9 to 72% according to the sites, but these variations were not linked to topographic or climatologic parameters. the infection with schistosoma bovis was much variable as well (12.5 to 72%) and seem ... | 1991 | 1775693 |
| common antigens of fasciola gigantica, dicrocoelium hospes and schistosoma bovis and their relevance to serology. | the possession of common antigens by three trematode parasites which commonly occur together in ruminants in the tropics, fasciola gigantica, dicrocoelium hospes and schistosoma bovis was studied in relation to the reliability of serodiagnosis of infection with these helminths. the crude antigenic extracts of the three trematodes were subjected to sephacryl s-300 column chromatography and f. gigantica was fractionated into six peaks, s. bovis into nine peaks and d. hospes into seven peaks. commo ... | 1991 | 1909064 |
| observations on natural and experimental interactions between schistosoma bovis and s. curassoni from west africa. | surveys of 332 naturally infected bovines at eight abattoirs in senegal, the gambia and mali were carried out to determine the prevalence of infection with schistosoma bovis and s. curassoni and to pinpoint areas where the distribution of the species overlap. s. bovis was the commonest schistosome of cattle in senegal and mali being found in animals at seven abattoirs, the highest prevalence of 85.1% occurred at mopti in mali. s. bovis was the only bovine schistosome observed in the gambia. s. c ... | 1990 | 1969699 |
| a comparison of the filtration, concentration, and thick smear techniques in the diagnosis of schistosoma bovis infection in cattle and goats. | the syringe and the modified bell filtration techniques, the cellophane faecal thick smear (kato/katz) and teesdale (sandwich) smear techniques, and the formol-ether concentration technique were compared for efficiency for detection of eggs of schistosoma bovis in faeces from cattle and goats. both filtration techniques were highly effective as revealed by high sensitivity and mean egg counts. however, efficiency declined markedly using formalin-fixed faecal material. the efficiency of the teesd ... | 1990 | 1973023 |
| acquired resistance in goats following a single primary schistosoma bovis infection. | the course of schistosoma bovis infection was monitored in west african dwarf goats over a 34-week period following primary, experimental exposure (3000 cercariae/animal) and over a 17-week period following challenge exposure (2500 cercariae/animal) of goats harbouring 17-week old primary infection. for comparison, groups of challenge control and parasite-free control animals were monitored. maximal egg excretion observed from week 8 to 12 following primary infection was accompanied by reduced w ... | 1990 | 1980805 |
| cercarial shedding patterns of schistosoma bovis and s. haematobium from single and mixed infections of bulinus truncatus. | the cercarial shedding of schistosoma bovis and s. haematobium were studied in single and mixed infections in the snail host bulinus truncatus. the two species displayed a distinctive diurnal cercarial emergence with an earlier shedding pattern for s. bovis than s. haematobium (the average emergence peaks were respectively at 0800 h and 1200 h). in mixed infections, each species kept its own cercarial shedding rhythm with no marked alterations. the cercarial emergence pattern is proposed as a ne ... | 1991 | 2050991 |
| bulinus africanus from ituri (north-east zaire) as a host for schistosoma bovis. | | 1990 | 2222008 |
| interference of echinoparyphium elegans with the host-parasite system bulinus truncatus-schistosoma bovis in natural conditions. | histological observations of bulinus truncatus naturally infected by both schistosoma bovis and echinoparyphium elegans in sardinia (italy) have shown that e. elegans is pathogenic to the mollusc and dominant to the schistosome. the larval stages, rediae and metacercariae, acted as compressors. rediae, mainly the young and very motile ones, also behaved as predators. the organs of the mollusc were variably affected; the ovotestis totally disappeared. the larval development of the schistosome was ... | 1990 | 2260898 |
| the response to schistosoma bovis in normal and t-cell deprived mice. | normal and t-cell deprived mice have been compared in their response to infection with schistosoma bovis. the deprived mice survived longer than comparably infected, immunologically intact controls, despite an increased longevity of the adult s. bovis worms in the former animals giving rise to higher tissue egg densities. the reduced pathology in deprived mice was due to inhibition of t-cell dependent granuloma formation around tissue-bound schistosome eggs, with concomitantly decreased tissue d ... | 1987 | 2447551 |
| schistosoma bovis as an immunological analogue of s. haematobium. | the host-parasite relationships of schistosoma bovis and s. haematobium have been compared in normal and t-cell-deprived mice, and have been found to contrast with that of s. mansoni. deprived mice infected with either of the former two schistosome species survived as long as, or longer than, comparably infected immunologically intact controls, and hepatocytes of infected deprived mice were not damaged in the absence of granuloma formation. s. mansoni-infected deprived mice, however, die earlier ... | 1989 | 2506507 |
| specific cross-protection between schistosoma bovis and s. haematobium induced by highly irradiated infections in mice. | significant levels of resistance against schistosoma haematobium challenge were developed by mice exposed to highly irradiated (20 krad) cercariae of the homologous species (46-53%) or of the closely related species, s. bovis (34-56%) but not of s. mansoni (-6-28%). this ability to cross-protect reflects the phylogenetic relationships between these species; s. mansoni and s. bovis, as well as s. mansoni and s. haematobium, failed to cross-protect. the cross-protection demonstrated between s. bov ... | 1989 | 2506508 |
| the influence of calicophoron microbothrium on the susceptibility of bulinus tropicus to schistosoma bovis. | a total of 480 snails were collected from 3 habitats on the mau escarpment, kenya, and were identified as bulinus tropicus. of the 351 snails examined alive in london, 75 were infected with calicophoron microbothrium, 39 with c. microbothrium and schistosoma bovis, 1 with s. bovis, 24 with other species of trematodes and 212 were uninfected. examination of digestive glands of b. tropicus either uninfected or infected with both c. microbothrium and s. bovis demonstrated that it is possible to dif ... | 1989 | 2726720 |
| [schistosoma bovis in the marrakech region]. | | 1989 | 2735703 |
| clinical pathology of schistosoma bovis infection in goats. | the clinical pathology of schistosoma bovis infection in west african dwarf goats was studied for 14 weeks following experimental infection. the length of the prepatent period was six weeks and the size of the egg output reached a maximum around eight to 10 weeks after which it diminished markedly. heavily infected animals showed reduced serum albumin, haemoglobin and packed cell volume values from week 6 to 8 onwards, but eosinophilia was not a striking feature. liver lesions were moderate in t ... | 1986 | 2871603 |
| epidemiological studies on schistosoma bovis in iringa region, tanzania. | various aspects of the epidemiology of schistosoma bovis were studied over a one-year period in iringa region, tanzania. an abattoir survey revealed an overall prevalence rate of 30.8% in cattle and 3.8% in goats in the area, and field studies on two dairy farms both providing good opportunities for schistosome transmission provided information concerning the transmission ecology of s. bovis in relation to different types of grazing and water supply. the traditional management system on one farm ... | 1986 | 2874712 |
| serum enzyme changes in calves experimentally infected with schistosoma bovis. | the activities of the enzymes sd, gd, aat, 5'nt, ggt, ldh and cpk were determined weekly in sera of two calves each infected with 10,000 s. bovis cercariae and in two controls. in infected animals, ldh activity increased from the first week of exposure and remained high throughout the experiment (22 weeks). ggt activity increased nine weeks after exposure and remained high. cpk activity was elevated during weeks 8-15 of infection. no change was detected in the activity of the other enzymes, nor ... | 1987 | 2886518 |
| schistosoma bovis in human stools in republic of niger. | | 1988 | 3188153 |
| spurious human infection with schistosoma bovis. | | 1988 | 3256112 |
| transmission of schistosoma bovis in mkulwe (mbozi district, mbeya region, southern highlands of tanzania). | various populations of laboratory bred bulinid snails were exposed to miracidia of schistosoma bovis from mbozi. the parasite is naturally transmitted by bulinus globosus in the area. laboratory infection revealed a good relationship with b. forskalii and b. globosus from mbozi and a population of b. forskalii from dar es salaam (infection rates 100%, 63.6% and 41.7% respectively). populations of b. globosus and b. nasutus from dar es salaam were refractory. it appears that both snail species (b ... | 1988 | 3372975 |
| protective effect of irradiated metacercariae of fasciola gigantica and irradiated cercariae of schistosoma bovis against fascioliasis in goats. | sensitisation of goats for eight weeks with metacercariae of fasciola gigantica gamma-irradiated at 3 kr resulted in significant resistance to an homologous challenge with normal metacercariae. however, serum sorbitol dehydrogenase assay suggested that, whereas little damage was produced by immunising infections, considerable hepatic damage was caused by flukes remaining from challenge infections. on the other hand sensitisation with cercariae of schistosoma bovis gamma-irradiated at 3 kr did no ... | 1987 | 3424453 |
| schistosoma bovis: variability of cercarial production as related to the snail hosts: bulinus truncatus, b. wright and planorbarius metidjensis. | | 1987 | 3440697 |
| [morphology of the teguments of schistosoma bovis; variations linked to the vertebrate host; comparison with s. curassoni]. | s. e. m. study of the dorsal anterior one third of male schistosoma bovis and of the anterior ventral border of the gynaecophoric duct. s. bovis was previously described as possessing spineless tubercles. this is so in specimens obtained from experimentally infected rodents, but in cattle, on the contrary, when conditions are favourable, teguments have spiny tubercles. two morphological types have been observed: the first in bos taurus from sardinia, the second in domestic (bos indicus) and wild ... | 1987 | 3447509 |
| parasitological observations of schistosoma bovis in normal and t-cell deprived mice. | a laboratory life-cycle of schistosoma bovis was established in order to study the host-parasite relationship in immunologically intact and t-cell deprived mice. normal mice were found to have 'self-cured' their s. bovis infections almost completely by 10 weeks after cercarial administration, and there was no evidence of self-cure by day 79 in t-cell deprived animals. thus, groups of deprived mice autopsied between 9 and 11 weeks after infection were invariably found to have greater worm burdens ... | 1987 | 3501098 |
| [comparative analysis of the rhythm of cercariae emergence in three strains of schistosoma bovis (trematoda: schistosomatidae)]. | a comparative experimental study of the rhythmic shedding of three geographic strains of schistosoma bovis cercariae (sardinian, sudanese and spanish) by bulinus truncatus showed a significant difference in the emergence patterns. the results support the existence of a genetic variability of the emergence rhythms. the origin of the variability is discussed and could be found in the pastoral practice and the ecological characteristics of the different transmission foci. | 1987 | 3508513 |
| egg polymorphism of schistosoma bovis. | a study of the egg morphology of schistosoma bovis from sudan and spain revealed some differences in the size and shape of eggs depending on the method of their sampling. the size of eggs (especially the length) tended to increase in the following order: those recovered from the worm uterus smaller than those recovered from the liver and from the faeces of mice for both strains. the shape of eggs from the host faeces (the typical ones) and from the distal portion of the worm uterus for both stra ... | 1987 | 3564347 |
| genetic variability of schistosoma bovis cercarial production according to miracidial dose. | cercarial production related to miracidial dose variation with schistosoma bovis strains from sudan and spain in bulinus truncatus from tunisia was studied. results showed that an increase in the miracidial dose proposed to the host-mollusc (1 and 5 miracidia) gave rise to a decrease in cercarial productivity of sudanese s. bovis and to an increase for spanish s. bovis. it is concluded that this response difference to the miracidial dose variation depends on genetic characters peculiar to the pa ... | 1987 | 3571926 |
| schistosoma bovis in human stools in kenya. | | 1986 | 3603628 |
| studies on heterologous resistance between schistosoma bovis and fasciola gigantica in sudanese cattle. | using the local strains of schistosoma bovis and fasciola gigantica, it was shown that sudanese zebu calves with mature primary infections of f. gigantica were highly resistant to challenge with s. bovis cercariae, and vice versa. liver enzyme tests showed that, in both cases, the primary infections had caused some liver damage. primary infection with irradiated s. bovis cercariae, which did not cause significant liver damage, did not protect significantly against challenge with f. gigantica. | 1986 | 3701021 |
| study on the intramolluscal development of schistosoma bovis: demonstration of three patterns of sporocystogenesis by daughter sporocysts. | daughter sporocysts (spii) of schistosoma bovis produced by the mother sporocyst (spi) can direct their production along three different pathways during intramolluscal development. (i) direct sporocystogenesis--tertiary sporocysts (spiii) are directly produced by non-cercariae producing daughter sporocysts (spii). (ii) simultaneous sporocystogenesis and cercariogenesis--spiii are produced by spii in which cercariae are being produced. (iii) sporocystogenesis after cercariogenesis--spiii are prod ... | 1986 | 3714301 |
| comparative analysis of the schistosoma mansoni and schistosoma bovis cercarial production under the influence of praziquantel. | snails infected with schistosoma mansoni and s. bovis and fed with a food-praziquantel mixture stop shedding cercariae for several days. the cercarial production restarts at different levels after stopping treatment: for some biomphalaria glabrata, the restarting phase of production reaches a high level whereas for other b. glabrata and all of the p. metidjensis, the level of production remains low. histological studies revealed that at the exact moment of this treatment, there is a total destru ... | 1986 | 3716542 |
| schistosoma bovis: patterns of cercarial emergence from snails of the genera bulinus and planorbarius. | a comparative experimental study of the rhythmic shedding of two geographic strains of schistosoma bovis cercariae by bulinus truncatus and planorbarius metidjensis did not show any differences in emergence patterns. in our opinion, the results support the hypothesis that cercarial emission rhythms are determined primarily by the parasite in these snail/parasite associations. | 1986 | 3780932 |
| bulinus tropicus from central kenya acting as a host for schistosoma bovis. | one hundred and twelve snails were collected from two habitats on the mau escarpment, kenya and were provisionally identified as bulinus tropicus from the characteristics of their shell and soft parts, chromosome number (n = 18), electrophoresis of egg protein on cellulose acetate strip and isoelectric focusing of acp, gpi, hbdh, mdh and pgm digestive gland enzymes. of the 55 specimens examined alive in london, 10 were infected with amphistome and schistosome larvae, 9 with amphistome larvae and ... | 1985 | 3984452 |
| a comparison of the efficiency of the percutaneous and per-oral routes of infection in caprine schistosoma bovis infections. | the comparative efficiency of the percutaneous and per-oral routes of infection was studied in goats experimentally infected with schistosoma bovis. the heaviest infection was obtained by the percutaneous route, but a relatively high parasite load was also achieved by the per-oral route, i.e., where goats were allowed to drink a cercarial suspension, volume of 0.9 to 1.7 litre per animal. studies using radio-isotopically labelled cercariae were designed to clarify the cercarial penetration sites ... | 1985 | 3989260 |
| protection of sheep against schistosoma bovis using cryopreserved radiation-attenuated schistosomula. | three sheep were vaccinated with two doses of 3 krad-irradiated cryopreserved schistosoma bovis schistosomula containing 20,000 and 17,000 organisms respectively, injected intramuscularly 23 days apart after storage in liquid nitrogen for between 9 and 46 days. a challenge of 5360 s. bovis cercariae was administered percutaneously approximately four weeks after the last vaccine dose to these animals and to three controls. post-challenge the vaccinated animals gained significantly more weight (27 ... | 1985 | 3989263 |
| [the choice of intermediate molluscan host by the miracidium of schistosoma bovis]. | when the usual intermediate hosts (b. truncatus and p. metidjensis) and several other species of molluscs are together exposed to the miracidia of s. bovis, we demonstrate that about 75% of the miracidia penetrate b. truncatus and p. metidjensis, while 25% penetrate the pulmonates (b. glabrata, b. straminea and h. duryi) and no miracidium penetrates the prosobranches (m. tuberculata, m. cornuarietis). when the miracidia penetrate the non-vector molluscs, it takes less than 24 hours for them to g ... | 1985 | 4085102 |
| studies on heterologous immunity in schistosomiasis. 6. observations on cross-immunity to ornithobilharzia turkestanicum, schistosoma bovis, s. mansoni, and s. haematobium in mice, sheep, and cattle in iran. | experiments were carried out in mice, cattle, and sheep to investigate the possibility that heterologous immune reactions may occur between the schistosomes prevalent in man and domestic animals in iran. immunization with ornithobilharzia turkestanicum from cattle produced a considerable degree of immunity in mice against challenge with schistosoma bovis, s. haematobium, and s. mansoni. the results of immunizing cattle with o. turkestanicum, s. bovis, and s. haematobium were even more striking; ... | 1972 | 4540679 |
| parasitological and pathological observations on schistosoma bovis sonsino, 1876, in calves, sheep and goats in iran. | | 1973 | 4724314 |
| [experimental infestations of schistosoma bovis of sardinia]. | | 1973 | 4788359 |
| [experiments with species crossing in schistosoma bovis and schistosoma mansoni]. | | 1973 | 4788360 |
| studies on heterologous immunity in schistosomiasis. 2. heterologous schistosome immunity in rhesus monkeys. | previous studies on heterologous immunity in mice have indicated that schistosoma bovis and s. mattheei could be used to limit the severity of infection resulting from subsequent challenge by s. mansoni. these observations have now been extended to study the immunizing effect in rhesus monkeys of both s. mattheei and s. bovis.the bovine schistosomes were shown to be relatively non-pathogenic in rhesus monkeys. immunization with 1000-2000 cercariae resulted in a marked reduction in the pathogenic ... | 1968 | 4970323 |
| the pathology of ornithobilharzia turkestanicum and schistosoma bovis in cattle, sheep and goats in iran. | | 1971 | 5107110 |
| electron microscope and histochemical observations on the daughter sporocyst of schistosoma mattheel and schistosoma bovis. | | 1971 | 5123701 |
| [morphological changes observed in females of schistosoma bovis during the course of development in a definitive host]. | | 1971 | 5152938 |
| host-parasite relationship of bulinus truncatus and schistosoma haematobium in iran. 4. effect of month of infection on cercarial-incubation periods of s. haematobium and s. bovis. | studies were conducted each month for one year to determine the cercarial-incubation periods of schistosoma haematobium and schistosoma bovis in bulinus truncatus for different months of infection. the snails were kept in outdoor aquaria in order to simulate the natural temperature conditions in the endemic bilharziasis areas of iran.the results showed that the cercarial-incubation periods of these two schistosome species varied with the environmental water temperature. snails exposed in august ... | 1966 | 5295560 |
| studies on heterologous immunity in schistosomiasis. i. heterologous schistosome immunity in mice. | epidemiological and experimental studies indicate that heterologous immunity resulting from exposure to bovine and other animal schistosomes might be of some importance in determining the relative severity of schistosome infection in man in different parts of the world. the reduction in the severity of a disease process, resulting from exposure to relatively non-pathogenic infections, has been called "zooprophylaxis".the observations recorded in the present paper on the interaction in mice of sc ... | 1968 | 5302295 |
| studies on heterologous immunity in schistosomiasis. 3. further observations on heterologous immunity in mice. | previous studies on heterologous immunity in mice and rhesus monkeys have shown that immunization with schistosoma bovis, s. mattheei or s. rodhaini cercariae can limit the severity of infection resulting from subsequent challenge with s. mansoni. the present report describes further evidence of the protection afforded by heterologous immunization. it has been demonstrated that mice immunized with s. mattheei can withstand s. mansoni infections that are lethal to normal mice and that the degree ... | 1969 | 5308699 |
| schistosoma bovis eggs in human faeces. | | 1969 | 5821278 |
| [susceptibility of bulinus contortus of rio mascari to infestation with schistosoma bovis]. | | 1966 | 5967943 |
| [infestation of bulinus contortus with cercaria of schistosoma bovis and paraphistomum cervi in sardinia]. | | 1966 | 6007825 |
| [experimental infestation of the albino rat with normal and x-irradiated cerceriae of schistosoma bovis]. | | 1967 | 6048347 |
| a review of the biology and transmission ecology of african bovine species of the genus schistosoma. | the present paper reviews the information available concerning the biology and transmission ecology of the african bovine species schistosoma bovis, s. mattheei, s. margrebowiei and s. leiperi. criteria for species identification (egg morphology, intermediate host spectra, definitive host-parasite relationships, etc.) are listed and the geographical distribution of the four species and factors determining the relative occurrence within their overall distributional ranges are described. s bovis a ... | 1983 | 6356670 |
| the pathogenesis of experimental schistosoma bovis infections in sudanese sheep and goats. | the pathogenic effects of experimental schistosoma bovis infection in sudanese sheep and goats were investigated by a variety of clinical, parasitological, physiological and histopathological techniques; uninfected animals of each species were used as controls. infected animals of both species lost or failed to gain weight and developed a haemorrhagic diarrhoea, inappetence, marked anaemia, hypoalbuminaemia, hyperglobulinaemia, hyperproteinaemia and eosinophilia. these changes first became notic ... | 1984 | 6470226 |
| bulinus tropicus (krauss, 1848) from kenya found naturally infected with schistosoma bovis. | | 1984 | 6486943 |
| observations on the infectivity and fecundity of a sudanese isolate of schistosoma bovis in albino mice. | a sudanese isolate of schistosoma bovis from experimentally infected sheep was found to be highly pathogenic to albino mice. eggs were first found in the livers 42 days after exposure. the distribution of eggs in the liver and small and large intestines changed little during the course of infection. results are compared with others using an iranian isolate of s. bovis, which causes only a mild infection, and s. mattheei. | 1984 | 6501861 |
| [development of the sporocysts of schistosoma bovis after microsurgical transplantation in bulinus truncatus]. | microsurgical transplantations of schistosoma bovis daughter sporocysts to uninfected bulinus truncatus leads to a dedifferenciation of transplanted sporocysts producing an additional generation of daughter sporocysts. these ones settle into the whole digestive gland and produce infective cercariae. for all the parasitosis, a part of the daughter sporocysts born from the transplanted ones, remains in the head-foot region and are in their turn responsible for an active sporocystogeny. data demons ... | 1984 | 6508141 |
| age specific prevalence and intensity of schistosoma bovis infection in sudanese desert sheep in the white nile province. | a survey of ovine schistosomiasis was carried out in a schistosoma bovis enzootic area in the central sudan. three hundred desert sheep, representing different age groups, were screened for infection, using pitchford's faecal egg counting technique. no infection was detected in animals under one year old, but from the age of 18 months onward, the prevalence increased progressively from around 20 per cent to 60 per cent in six-year-old sheep, and this was accompanied by an increase in infection i ... | 1983 | 6622838 |
| clinical diagnosis of schistosomiasis in sudanese cattle. | this study was done in the white nile province to characterise the history and signs of naturally occurring schistosoma bovis infection in cattle (gorag). necropsy and laboratory examinations were performed on 10 animals six to 30 months of age which were in poor condition. they were selected because of a history suggestive of schistosomiasis. all the animals showed some degree of s. bovis infection; eight had a moderate or heavy degree of infection. also all had liver damage due to either past ... | 1983 | 6623642 |
| studies on the relationship between schistosoma and their intermediate hosts. v. the genus bulinus and schistosoma bovis from iringa, tanzania. | the relationship between an isolate of schistosoma bovis from iringa, tanzania, and various species of the host snail genus bulinus from east africa was studied using the total cercarial production per 100 exposed snails over a period of 4 weeks following patency as an index of the compatibility. all populations of bulinus forskalii and b. africanus tested exhibited a high level of susceptibility while the populations of b. truncatus and b. globosus tested were either refractory or of low to mod ... | 1983 | 6624195 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. iv. preliminary observations on the mechanism of naturally acquired resistance. | suppression of egg production is the main parasitological manifestation of naturally acquired resistance to schistosoma bovis in sudanese cattle. in preliminary investigations on the mechanisms involved, 700-4,000 "suppressed" adult worms were surgically transplanted from six "resistant" donor cattle with very low fecal egg counts (0-8 eggs/g, epg) into six normal recipients. after transplantation, large numbers of eggs were excreted in the feces of the recipient cattle, beginning at between 5 a ... | 1983 | 6625062 |
| bulinus browni jelnes, 1979 (gastropoda: planorbidae), a member of the forskalii group, as intermediate host for schistosoma bovis in western kenya. | | 1983 | 6636289 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. v. the effect of praziquantel therapy on naturally acquired resistance to schistosoma bovis. | studies in the white nile area of the sudan have shown that zebu cattle acquire a high degree of resistance to schistosoma bovis as a result of repeated natural exposures without, however, being able to eliminate their populations of adult schistosomes, although these do show greatly suppressed fecundity. to test whether these adult worms are necessary for the maintenance of resistance we cured six "naturally resistant" cattle (tc group) with a double treatment of 25 mg/kg praziquantel and compa ... | 1983 | 6650738 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. vi. demonstration of resistance to schistosoma bovis challenge after a single exposure to normal cercariae or to transplanted adult worms. | calves were immunized with schistosoma bovis by a single experimental exposure to 10,000 normal cercariae. some of these calves were perfused 14 weeks later, and a part of their worm loads was surgically transplanted into groups of normal recipient calves: "wpr" group calves received 500 pairs of worms; "mr" group calves received between 650 and 1,000 male worms alone. all three groups were subsequently challenged 10 weeks after surgery with 20,000 cercariae, as were a previously unexposed group ... | 1983 | 6650739 |
| erythrokinetics and albumin metabolism in primary experimental schistosoma bovis infections in zebu calves. | red cell kinetics and albumin metabolism were studied in calves infected with either 100 or 200 schistosoma bovis cercariae per kg body weight, by the use of 59fe-labelled transferrin, 51cr-labelled erythrocytes and 125i-labelled albumin; a third group of worm-free animals acted as controls. the anaemia which developed in the infected calves was shown to be due basically to an accelerated rate of red cell loss from the circulation, and became evident around the seventh week of infection, increas ... | 1984 | 6736311 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. i. epizootiological observations on schistosoma bovis in the white nile province. | a 2-year epizootiological study was carried out on schistosoma bovis in cattle in an enzootic area of the sudan. the prevalence of infection, as judged by the pitchford fecal egg counting technique, was very high, approaching 90% in 1.5-year-old animals. there was, however, a lower prevalence in older cattle, and this trend was also seen with the fecal egg counts. this suggests that the cattle gradually acquire resistance to reinfection, particularly since there seems to be little age-related va ... | 1980 | 6966898 |
| [use of a heterologous antigen (schistosoma bovis) for the immunoenzymatic serodiagnosis of urinary bilharziasis]. | the authors propose the utilisation of an heterologous antigen, schistosoma bovis for the diagnosis of human schistosomiases by enzyme immunoassay. the method is particularly recommended for the detection of s. haematobium and s. intercalatum diseases. it is sensitive and reproducible, its specificity being only limited by the existence of cross-reactions with some tissular helminthiases. | 1981 | 6976218 |
| effects of praziquantel and metrifonate on schistosoma bovis infections in sudanese cattle. | twelve nine-month-old zebu calves were each experimentally infected with 10,000 schistosoma bovis cercariae. four were treated orally with 20 mg/kg praziquantel at weeks 9 and 14 after infection, and four were treated orally three times with metrifonate at week 11 (25 mg/kg) and again at week 14 (50 mg/kg). praziquantel proved to be highly effective, reducing faecal egg counts near to zero; the mean live worm count in the treated calves at week 16 was only 32, compared to 2850 in the untreated g ... | 1982 | 7134640 |
| clinical pathology of schistosoma bovis infection in sheep. | the clinical pathology of schistosoma bovis infection in sheep was studied for a period of 16 weeks. the length of the prepatent period was 10 weeks, and reduced haemoglobin and packed cell volume values and increased serum gammaglutamyl-transpeptidase levels were observed from eight to 10 weeks after infection and onwards. the bromsulphalein clearance rate was significantly reduced 16 weeks after infection. eosinophil counts were increased six and eight weeks after infection and towards the end ... | 1982 | 7156514 |
| the pathogenesis of schistosoma bovis infection in sudanese cattle. | | 1980 | 7193925 |
| prospects for the control of schistosoma bovis infection in sudanese cattle. | | 1980 | 7210106 |
| resistance to fasciola hepatica in calves harbouring primary patent schistosoma bovis infections. | a substantial resistance to a heterologous challenge with fasciola hepatica was demonstrated in calves harbouring primary patent schistosoma bovis infections of an age of 10 weeks at challenge, the mean worm burden being reduced by 29.9% (p less than 0.025) in calves primarily infected with s. bovis as compared with that of the challenge control group. the heterologous resistance was also evidenced by less pronounced liver tissue damage and lower serum gammaglutamyl-transpeptidase values in the ... | 1981 | 7229334 |
| schistosoma bovis, s. intercalatum and s. haematobium: methods for in vivo radiolabelling of cercariae with radioselenium. | cercariae of schistosoma bovis, s. intercalatum and s. haematobium were radiolabelled by individual exposure of their respective host snails to 75se-methionine in 1 ml water for a period of 20 hours. maximum cercaria-bound radioactivity was obtained four to seven days after labelling of snails, but detectable levels of radioactivity incorporation were obtained with all three species for a period of 32 days. the radiolabelling procedure did not interfere with the production of cercariae or with t ... | 1981 | 7229335 |
| resistance to fasciola hepatica in sheep harbouring primary schistosoma bovis infections. | a substantial level of resistance to a heterologous challenge with fasciola hepatica was demonstrated in sheep harbouring primary non-patent (two- to three-week-old) and newly patent (seven- to eight-week-old) schistosoma bovis infections, the liver-fluke burdens being reduced by 70% and 93%, respectively, (p less than 0.01) in these groups compared with that of the challenge control group. the resistance was also reflected in less pronounced f. hepatica-induced liver damage and presumably also ... | 1981 | 7310108 |
| schistosoma bovis in calves: the development and clinical pathology of primary infections. | the clinico-pathological effects of schistosoma bovis were monitored in zebu calves for a year after exposure to 100 or 200 cercariae/kg body weight and were related to the number and reproductive activities of the parasites present. the disease was characterised by diarrhoea, weight loss or poor weight gain, anaemia, serum protein changes and eosinophilia. these changes were broadly related to the level of infection and were most prominent during the two months following patency when faecal egg ... | 1980 | 7375721 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. ii. experimental demonstration of naturally acquired resistance to schistosoma bovis. | epizootiological observations on schistosoma bovis in cattle at kosti, sudan, showed a significant fall in age-specific prevalence and intensity with age, based on fecal egg count. to test the possibility that this is due to acquired resistance, kosti cattle and a control group of cattle of similiar breed and age from a nonenzootic area were experimentally challenged with 70,000 s. bovis cercariae. clinical observations showed very clearly that the kosti cattle were able to withstand almost comp ... | 1980 | 7386722 |
| observations on cattle schistosomiasis in the sudan, a study in comparative medicine. iii. field testing of an irradiated schistosoma bovis vaccine. | previous work has shown that cattle can acquire a strong resistance to schistosoma bovis infection following repeated natural exposure. partial resistance to a laboratory challenge with s. bovis has also been demonstrated in calves after immunization with an irradiated schistosomular or cercarial vaccine. the aim of the present study was to see whether this type of vaccine could protect calves under the very different conditions of natural exposure to s. bovis in the field. thirty 6- to 9-month- ... | 1980 | 7386723 |
| incidence of liver fluke infections (fasciola gigantica and dicrocoelium hospes) in ruminants in northern nigeria. | one thousand and twenty-four cattle, 550 sheep and 1,748 goats slaughtered in a rural slaughter slab during 1973 to 1975 were examined for evidence of liverfluke infections. the prevalence rate of fasciola gigantica and dicrocoelium hospes infections was respectively 65.4% and 56.0% in cattle, 40.8 and 13.1% in sheep and 17.6 and 5.2% in goats. other trematodes detected were schistosoma bovis and paramphistomes. the seasonal incidence of f. gigantica as well as of d. hospes was highest during an ... | 1980 | 7414705 |
| observations on an isolate of schistosoma bovis from tanzania. | the eggs of schistosoma bovis isolated from misungwi, tanzania measure 211.1 micrometer +/- 18.4 long and 66.7 micrometer +/- 5.4 wide. the parasite is naturally transmitted by bulinus africanus and is compatible in the laboratory with snails belonging to the b. truncatus. b. forskali, and b. reticulatus groups. the compatibility with b. africanus group snails is shared with isolates from kenya and sudan but not with s. bovis from more northern distributions. enzyme analyses were carried out by ... | 1980 | 7434872 |
| malumfashi endemic diseases research project xii. schistosoma bovis and fasciola gigantica in livestock. | | 1980 | 7458459 |
| glucose uptake rates by schistosoma mansoni, s. haematobium, and s. bovis adults using a flow in vitro culture system. | a simple flow culture apparatus was designed for the short-term in vitro culture of adult schistosomes. the use of this system allowed sensitive estimation of relative rates of glucose uptake by different species of schistosome. these data suggest that in parasites maintained carefully in conditions within the physiological range of glucose concentration, uptake of glucose is entirely carrier mediated. the rates of glucose uptake by schistosoma haematobium and its close relative schistosoma bovi ... | 1995 | 7623209 |
| acquired resistance against schistosoma bovis after single or repeated low-level primary infections in goats. | experimental schistosoma bovis infections were studied in groups of six goats for 32 weeks. two types of primary infections, a single exposure to 400 cercariae per goat or repeated (trickle) exposure to 200 cercariae per goat weekly for 10 weeks, were followed by a challenge infection with 2000 cercariae per goat in week 16 of the experiment. periods of high faecal egg excretion were associated with reduced weight gain, anaemia, hypoalbuminaemia and blood eosinophilia; these changes gradually di ... | 1995 | 7709058 |
| tissue response of goats to single or repeated low-level doses and to a massive challenge dose of schistosoma bovis. | the inflammatory tissue response to schistosoma bovis in the small intestine and liver of goats was studied by light microscopy 32 weeks after they had been exposed to 10 weekly ('trickle') doses of 200 cercariae or to a single dose of 400 cercariae, and 32 weeks after the same dosing schedules followed by a challenge exposure to 2000 cercariae in week 16 of the experiment, and 16 weeks after a single exposure to 2000 cercariae in week 16 (challenge control). the tissue egg counts in the small i ... | 1995 | 7709062 |