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seroprevalence of neospora spp. among asymptomatic horses, aborted mares and horses demonstrating neurological signs in israel.sera from 800 asymptomatic horses were examined for the presence of antibodies to neospora caninum by immunofluorescence antibody test (ifat). the presence of antibodies to n. caninum was also tested in sera from 52 mares that had aborted and 40 horses exhibiting neurological signs. a total of 95 (11.9%) of the 800 sera had antibodies for neospora. significantly higher seropositivity was obtained from horses that had neurological signs (21.2%) and from aborted mares (37.5%). there was significan ...200717614202
fecal and serological survey of neospora caninum in farm dogs in costa rica.to detect oocysts of neospora caninum in dog feces and to determine the excretion pattern in dogs from specialized dairy farms in costa rica, a total of 265 fecal samples from 34 dogs were collected at intervals from february to august 2005. fecal samples were examined for n. caninum-like oocysts microscopically, by dna detection using the polymerase chain reaction (pcr), and by bioassay. n. caninum dna was detected by pcr in four fecal samples, twice from one dog, but oocysts were not detected ...200717868998
neosporosis in beagle dogs: clinical signs, diagnosis, treatment, isolation and genetic characterization of neospora caninum.clinical neosporosis was diagnosed in a litter of five pups born to a beagle bitch from virginia, usa. four of the pups developed limb weakness starting at 4 weeks of age. the dogs were suspected to have neosporosis based on clinical signs and empirically treated with clindamycin (75 mg, oral, twice daily, total 150 mg) starting at 9 weeks of age and the dosage was doubled at 13 weeks of age. antibodies to neospora caninum were detected in sera of the dam and pups when first tested serologically ...200717890012
sarcocystis sp.-associated meningoencephalitis in a bald eagle (haliaeetus leucocephalus).protozoal meningoencephalitis is uncommon in raptors. an adult female bald eagle (haliaeetus leucocephalus) was euthanized after several months of treatment for progressive neurologic signs. the predominant histologic lesion was lymphoplasmacytic and histiocytic meningoencephalitis involving the cerebrum and cerebellum. there was a marked segmental loss of granular cells and purkinje cells, as well as segmental atrophy of the molecular layer in the cerebellum. protozoal merozoites and schizonts ...200717823405
neosporosis and hammondiosis in dogs.the dog is a definitive host of the protozoan parasite neospora caninum, and in many parts of the world, infection is relatively common as determined by serology. reported seroprevalences usually range from 0 to 20 per cent, however, reports of clinically affected dogs are infrequent. affected dogs are generally less than six months old and predominantly have signs of an ascending hindleg paralysis, with the associated lesions of polyradiculoneuritis and granulomatous polymyositis. although any ...200717547641
cutaneous toxoplasmosis in a female japanese cat.a 16-year-old female japanese cat was presented with a single mammary-gland nodule approximately 3 cm in diameter. histologically, the nodule consisted of necrotizing granulomatous panniculitis, vasculitis, and mastitis, and contained free and clustered protozoal organisms. the organism was present in the cytoplasm of macrophages, fibroblasts, endothelial cells, and mammary-gland epithelia. the organism was positive for anti- toxoplasma gondii and anti- neospora caninum antibodies. electron micr ...200717846241
internal hydrocephalus and associated periventricular encephalitis in a young fox.marked lateral ventricular enlargement associated with atrophic cerebral cortex and periventricular encephalitis is described in a 2-month-old fox affected by disorientation, generalized ataxia, difficulty in walking, circling, and blindness. clinical conditions progressed to stupor and spontaneous death within a few days. at necropsy, severe inflammatory and necrotizing lesions were observed in periventricular sites associated with diverticula and cleft formation in perithalamic areas and rhine ...200717846249
isolation of neospora caninum from dairy zero grazing cattle in israel.first israeli neospora caninum isolates were obtained from brain tissues of aborted fetuses (ncis491 and ncis580) from dairy farms endemic for neosporosis and maintaining cattle on zero grazing. tissues from different parts of the fetus brains were used to infect vero cells. tachyzoites of n. caninum were first observed in cultures from days 30 and 32 after infection. to confirm the identity of the isolated parasites, dna extracts from brains and cultures were tested by pcr with specific primers ...200717850972
protection against abortion linked to gamma interferon production in pregnant dairy cows naturally infected with neospora caninum.many immunological aspects of pregnancy, such as the role played by gamma interferon (ifn-gamma) in abortion, are not well understood. neospora caninum is an intracellular protozoan considered to be among the main causes of abortion in cattle worldwide. the present study analyzes the interaction between ifn-gamma production and n. caninum infection in naturally infected pregnant cows. data were obtained from 126 pregnant cows: 86 seropositive and 40 seronegative for the parasite. pregnancy diagn ...200717854883
possible role of bovine trophoblast giant cells in transplacental transmission of neospora caninum in cattle.neospora caninum is an aplicomplexan parasite that has brought several concerns to cattle raisers worldwide due to its relationship to fetal loss. however, the mechanism of the parasite's transplacental infection and induced abortions are not completely understood. bovine trophoblastic binucleated cells (bnc) play a major role in the maternal-fetal interactions, migrating during the entire pregnancy from chorionic connections to uterine epithelium. this study aimed to investigate the possible ro ...200717588318
development of two immunochromatographic tests for the serodiagnosis of bovine babesiosis.in this study, we developed two immunochromatographic tests (icts), which are nitrocellulose membrane-based immunoassays for the convenient and rapid serodiagnosis of bovine babesiosis caused by babesia bovis (boict) and babesia bigemina (biict). the efficacy of two icts was evaluated using 13 positive sera from experimentally infected cattle with b. bovis or b. bigemina. clear results showed that the boict and elisa detected antibodies in sera collected from 14 to 93 days post-infection, while ...200717590275
seroprevalence of neospora caninum infection in dogs from rural and urban environments in tehran, iran.103 serum samples were taken from owned dogs in tehran (53 urban dogs and 50 farm dogs) from february to may 2005 and tested for igg antibody against neospora caninum using the immunofluorescence antibody test. urban dogs were selected from apparent healthy dogs referred to the small animal hospital of faculty of veterinary medicine, university of tehran, for routine operation, and the farm dogs were selected from the sheepdogs in sheep flocks around tehran randomly. the titer of 1:50 was select ...200717687566
possibility of neospora caninum infection by venereal transmission in cb-17 scid mice.cb-17 scid and balb/c male mice were inoculated intraperitoneally with neospora caninum to examine the possibility of its venereal transmission. some of these mice were killed on days 7 and 20 post-inoculation to examine the genital organs for presence of the parasite. the remaining scid male mice were housed with non-infected female mice from day 7 p.i. and kept with them for 14 days. these scid mice died between days 28 and 35 p.i. n. caninum dna was detected in the testis of mice on days 7 an ...200717689194
humoral immune response in pregnant heifers inoculated with neospora caninum tachyzoites by conjunctival route.the aim of this study was to compare systemic humoral immune responses in pregnant heifers inoculated with neospora caninum tachyzoites by conjunctival and intravenous routes. twenty nine heifers separated in three experimental groups were studied: group 1 (n=10 animals) and group 2 (n=9 animals) were inoculated with 10(8) of n. caninum tachyzoites by conjunctival and intravenous routes at 5th month of gestation, respectively; group 3 (n=10 animals) were non-inoculated control animals. an indire ...200717697754
prevalence of anti-toxoplasma gondii and anti-neospora caninum antibodies in goats slaughtered in the public slaughterhouse of patos city, paraíba state, northeast region of brazil.the prevalence of anti-toxoplasma gondii and anti-neospora caninum antibodies was investigated in goats slaughtered in the public slaughterhouse of patos, state of paraíba, northeast region of brazil, and possible associations between sex of the animals and antibody prevalence were verified. three-hundred six blood samples from goats collected before slaughter by jugular venopuncture were used. for the serologic diagnosis of t. gondii and n. caninum, the indirect fluorescent-antibody test (ifat) ...200717706359
first identification of neospora caninum infection in aborted bovine foetuses in china.the first identification of neospora caninum infection in the tissues of aborted bovine foetuses in china is reported. aborted foetuses were collected from 16 dams, and 12 of the dams had high serum antibody titres to n. caninum determined using an elisa test kit. the nc-5 gene of n. caninum was amplified from dna samples extracted from brains of four aborted foetuses using a neospora-specific pcr assay, confirming n. caninum infection in the aborted foetuses. histology and immunohistochemistry ...200717706874
neospora caninum in cattle: experimental infection with oocysts can result in exogenous transplacental infection, but not endogenous transplacental infection in the subsequent pregnancy.whilst it is presumed that infection of pregnant cattle with neospora caninum oocysts can provoke abortion and is the likely cause of epidemic abortion outbreaks, only two previous experiments have involved inoculation of pregnant cows with oocysts (and only one abortion was provoked in 22 pregnancies). here, we describe the oral oocyst challenge of 18 cows synchronously bred and inoculated precisely at 70 (n=6), 120 (n=6) and 210 (n=6) days in pregnancy with a nominal dose of 40,000 oocysts. on ...200717624353
quantification of vertical and horizontal transmission of neospora caninum infection in dutch dairy herds.ninety-six of 108 randomly selected dutch dairy herds had one or more cows with a positive serostatus for n. caninum. in these 96 herds, we have quantified the probabilities of vertical transmission (vt) and horizontal transmission (ht) of n. caninum infection by combining serostatus and pedigree data in 4091 dam-daughter pairs. the probability of animals infected by vertical transmission during pregnancy (prob(vt)) was calculated as the proportion of seropositive daughters among daughters of se ...200717640807
dynamics of anti-neospora caninum antibodies during gestation in chronically infected dairy cows.the dynamics of antibody production against neospora caninum during the gestation period was examined in chronically infected dairy cows. data were obtained from 86 pregnant parous dairy cows, 21 of which had suffered abortion. the cows belonged to two herds in which a diagnosis of n. caninum infection had been previously confirmed in aborted foetuses. pregnancy diagnosis and blood collection were performed on post-insemination days 40, 90, 120, 150, 180, 210, and at parturition or until the tim ...200717643822
reduced cerebral infection of neospora caninum in balb/c mice vaccinated with recombinant brucella abortus rb51 strains expressing n. caninum srs2 and gra7 proteins.neospora caninum, an obligate intracellular protozoan parasite, is the causative agent of bovine neosporosis, an important disease affecting the reproductive performance of cattle worldwide. currently there is no effective vaccine available to prevent n. caninum infection in cattle. in this study, we examined the feasibility of developing a live, recombinant n. caninum vaccine using brucella abortus vaccine strain rb51 as the expression and delivery vector. we generated two recombinant rb51 stra ...200717651896
evidence of neospora caninum dna in wild rodents.seventy-five house mice (mus musculus), 103 rats (rattus norvegicus) and 55 field mice (apodemus sylvaticus) from north-west italy were pcr analysed for neospora caninum infection. brain, kidney and muscle tissues collected from the above mentioned animals were tested by pcr using np6 and np21 primers. the brain tissue from 2 house mice and 2 rats, the kidney from 4 rats, 1 house mouse and 1 field mouse and muscle from 10 rats, 8 house mice and 1 field mouse were tested positive for n. caninum. ...200717651897
neospora caninum infection in birds: experimental infections in chicken and embryonated eggs.neospora caninum causes economical impact in cattle-raising farms since it is implicated as the major cause of bovine abortions. although infection by the parasite has been widely described in mammals, the role of birds in its life-cycle is still obscure. therefore, this work aimed to evaluate the infection by n. caninum in different chicken models. experimental infections were conducted in 7-day-old chicks, laying hens and embryonated eggs, where samples were analysed for parasite burden, igg a ...200717686190
immunoanalysis of three litters born to a doberman bitch infected with neospora caninum.neospora caninum is a tissue cyst-forming coccidium that may cause neuromuscular disorders in dogs. infected bitches can transmit the parasite to their pups in utero. vertical transmission may occur after primary infection during pregnancy and in subsequent pregnancies. the reason why only a few pups develop clinical neosporosis is unknown. we obtained sera from a doberman bitch and its offspring delivered in three litters. the bitch had a titer of 1:640 in an indirect fluorescent antibody test ...200717096148
presence of neospora caninum specific antibodies in three dairy farms in georgia and two in texas.neospora caninum is known to cause abortion in cattle. this study demonstrated the presence of specific igg to neospora in milk and serum samples obtained from three dairy farms in georgia and two in texas. samples from four hundred fourteen dairy cows were examined using a western blot assay of which 362 were milk and 87 were serum. samples with antibodies to neospora were identified in 32.1% (105/327) of the examined animals in georgia, whereas in texas it was identified in 10.3% (9/87). posit ...200717112670
seroepidemiology of toxoplasma gondii and neospora caninum in seals around hokkaido, japan.serological analysis was performed to detect toxoplasma gondii and neospora caninum infection in seals in hokkaido. serum samples were collected from 322 kuril harbor seals (phoca vitulina stejnegeri) at nosappu, akkeshi and erimo, from 46 spotted seals (p. largha) at nosappu, erimo, yagishiri island, hamamasu and syakotan, and from 4 ribbon seals (p. fasciata) and a bearded seal (erignathus barbatus) at nosappu between 1998 and 2006. recombinant surface antigen of t. gondii (sag2t) and n. canin ...200717485927
prevention of lethal experimental infection of c57bl/6 mice by vaccination with brucella abortus strain rb51 expressing neospora caninum antigens.bovine abortions caused by the intracellular protozoal parasite neospora caninum are a major concern to cattle industries worldwide. a strong th1 immune response is required for protection against n. caninum. brucella abortus strain rb51 is currently used as a live, attenuated vaccine against bovine brucellosis. strain rb51 can also be used as an expression vector for heterologous protein expression. in this study, putative protective antigens of n. caninum mic1, mic3, gra2, gra6 and srs2, were ...200717568587
detection of toxoplasma gondii in water by an immunomagnetic separation method targeting the sporocysts.an immunomagnetic separation (ims) method was developed to detect toxoplasma gondii in fresh waters by using the monoclonal antibody 4b6 targeting the sporocyst wall of t. gondii, hammondia hammondi, hammondia heydorni, and neospora caninum. water concentrates obtained by filtering 10- to 20-l samples samples were spiked with toxoplasma oocysts, sonicated to release the sporocysts, and analyzed by ims-4b6. mean sporocyst recoveries were 74.5 +/- 5.3% in drinking water, 30.6 +/- 2.4 and 37.1 +/- ...200717530288
use of an enzyme-linked immunosorbent assay in bulk milk to estimate the prevalence of neospora caninum on dairy farms in prince edward island, canada.this study evaluated the use of bulk milk as a diagnostic tool for estimation of herd-level neospora caninum exposure in atlantic canada; it was used to estimate the prevalence of dairy farms with a within-herd n. caninum-seroprevalence > or = 15% in prince edward island (pei). the variation over time of n. caninum antibodies in bulk milk is also reported. skimmed bulk milk and individual serum samples were analyzed for n. caninum antibodies by using an enzyme-linked immunosorbent assay (elisa). ...200717542367
serodiagnosis of neospora caninum infection in cattle using a recombinant tncsrs2 protein-based elisa.the truncated ncsrs2 gene (tncsrs2) by removal of the n-terminal hydrophobic sequence was cloned into the pgex-6p-1 plasmid and subsequently expressed as a glutathione-s-transferase (gst) fusion protein. the purified recombinant tncsrs2 protein was specific to neospora caninum and was used in an elisa for the diagnosis of neosporosis. there was a good agreement between tnctsrs2-based elisa and three commercially available diagnostic kits (idexx elisa, hipra elisa and vmrd ifat). three hundred da ...200716989950
treatment of canine pediatric neospora caninum myositis following immunohistochemical identification of tachyzoites in muscle biopsies.a 7-week-old irish wolfhound was evaluated for an abnormal hind limb gait. quadriceps muscle atrophy was pronounced and patellar reflexes were absent bilaterally. neospora caninum myositis was diagnosed by histopathologic and serologic examination and immunohistochemical staining of muscle. substantial clinical improvement was noted after 18 weeks of treatment with clindamycin.200717542369
comparison of serological methods for the diagnosis of neospora caninum infection in cattle.the aims of this study were to evaluate the performance and agreement of various commercial and in-house neospora caninum antibody assays used in dairy cattle in north america, and to investigate reproducibility of two assays performed in different laboratories. from 1998 to 2005, three enzyme linked immunosorbent assays (elisas, a competitive elisa-vmrd inc., an indirect elisa-biovet inc., and another indirect elisa-herdchek idexx corp.), two indirect fluorescent antibody tests (ifats, vmrd inc ...200716989951
detection of pathogens in ovine and caprine abortion samples from sardinia, italy, by pcr.during 2003-2005, 399 abortion samples (315 fetuses and 84 placentae) were collected from 107 ovine and caprine farms in northern sardinia. tissues from aborted fetuses and placentae were examined by pcr assay to detect dna from coxiella burnetii, chlamydophila abortus, salmonella enterica serovar abortusovis, toxoplasma gondii, and neospora caninum. the dna from at least 1 of these 5 infectious agents was amplified in 41% of ovine fetuses, while only 17% of the caprine fetuses yielded a positiv ...200717459840
necrotizing encephalitis of unknown cause in fennoscandian arctic foxes (alopex lagopus).a neurologic disease affected a colony of endangered fennoscandian arctic foxes (alopex lagopus) kept in captivity for breeding purposes. several outbreaks of disease occurred between 1994 and 2004. the clinical signs included ataxia, indications of anosmia, blindness, and abnormal behavior. the disease was characterized by severe necrotizing encephalitis affecting mostly the cranial cerebrum, basal ganglia, and olfactory bulbs. investigations to identify the etiology of the disease included tes ...200717459845
prevention of vertical transmission of neospora caninum in c57bl/6 mice vaccinated with brucella abortus strain rb51 expressing n. caninum protective antigens.bovine abortions caused by the apicomplexan parasite neospora caninum have been responsible for severe economic losses to the cattle industry. infected cows either experience abortion or transmit the parasite transplacentally at a rate of up to 95%. neospora caninum vaccines that can prevent vertical transmission and ensure disruption in the life cycle of the parasite greatly aid in the management of neosporosis in the cattle industry. brucella abortus strain rb51, a commercially available vacci ...200717575983
factors associated with variation in neospora caninum bulk-milk s/p ratios in initially bulk-milk negative testing dutch dairy herds.we conducted a study on 81 initially bulk-milk elisa negative dairy herds taken from a random sample of dutch dairy herds to evaluate variation in bulk-milk s/p ratios and to study reasons for bulk-milk conversion. these herds were repeatedly (3-month intervals) tested between april 2004 and august 2005 and serostatus of all animals had previously been established as negative (n), low-positive (lp) or high-positive (hp). of these herds, herd- and test-related factors associated with variation in ...200717566576
the apicomplexan pathogen neospora caninum inhibits host cell apoptosis in the absence of discernible nf-kappa b activation.neospora caninum, a causative agent of bovine abortions, is an apicomplexan parasite that is closely related to the human pathogen toxoplasma gondii. since a number of intracellular parasites, including t. gondii, have been shown to modulate host cell apoptosis, the present study was conducted to establish whether n. caninum is similarly capable of subverting apoptotic pathways in its host cells. our results indicated that death receptor-mediated apoptosis is repressed during n. caninum infectio ...200717576757
prevalence of antibodies against toxoplasma gondii and neospora caninum in hungarian red foxes (vulpes vulpes).in the present study we have investigated the seroprevalence to the protozoan parasites toxoplasma gondii and neospora caninum in 337 red foxes (vulpes vulpes) from 16 out of 19 counties in hungary. the foxes were originally collected within a national vaccination program against rabies. antibodies to t. gondii were detected in as many as 228 (68%) of the foxes using a commercial direct agglutination test (dat). in an indirect iscom elisa, five foxes (1.5%) were positive for antibodies against n ...200717045742
prevalence of neospora caninum and toxoplasma gondii in sheep and dogs from guarapuava farms, paraná state, brazil.sheep and dog blood samples were collected from nine farms in the county of guarapuava, paraná, brazil. the indirect fluorescent antibody test (ifat) was used to detect neospora caninum and toxoplasma gondii antibodies. herein, serum samples from 305 sheep were evaluated, being 29 (9.5%) and 157 (51.5%) seropositives to n. caninum and t. gondii, respectively. seven (29.1%) and five (20.8%) out of 24 dogs were seropositives to n. caninum and t. gondii, respectively. there were no differences amon ...200717266999
immunogenicity and protective effect against murine cerebral neosporosis of recombinant ncsrs2 in different iscom formulations.recombinant ncsrs2, a major immunodominant surface antigen of the intracellular protozoan parasite neospora caninum, was used as a model antigen to compare the immunogenicity of iscoms prepared according to three different methods. two ncsrs2 fusion proteins were used, one that was biotinylated upon expression in escherichia coli and linked to ni2+-loaded iscom matrix (iscom without any protein) via a hexahistidyl (his6)-tagged streptavidin fusion protein, and another that contained both a his6- ...200717280751
experimental neosporosis in bulls: parasite detection in semen and blood and specific antibody and interferon-gamma responses.to investigate the presence of neospora caninum in semen and blood, and the development of specific antibody and interferon-gamma (ifn-gamma) responses in experimentally infected bulls.200717316779
production effects of pathogens causing bovine leukosis, bovine viral diarrhea, paratuberculosis, and neosporosis.the primary purpose of this research was to determine associations among seropositivity for bovine leukemia virus (blv), bovine viral diarrhea virus (bvdv), mycobacterium avium ssp. paratuberculosis (map), and neospora caninum (nc) and each of 3 outcome variables (305-d milk, fat, and protein production) in canadian dairy cattle. serum samples from up to 30 randomly selected cows from 342 herds on monthly milk testing were tested for antibodies against blv (idexx elisa; idexx corporation, westbr ...200717235141
molecular characterisation of bsr4, a novel bradyzoite-specific gene from neospora caninum.here we present the identification and cloning of the ncbsr4 gene, the putative neospora caninum orthologue to the toxoplasma gondii tgbsr4 gene. to isolate ncbsr4, genome walking pcr was performed on n. caninum genomic dna using the expressed sequence tag ncest3c28h02.y1 sequence, which shares a 44% identity with the tgbsr4 gene, as a framework. nucleotide sequencing of amplified dna fragments revealed a single uninterrupted 1227 bp open reading frame that encodes a protein of 408 amino acids w ...200717376452
optimization of the use of c57bl/6 mice as a laboratory animal model for neospora caninum vaccine studies.the development and testing of vaccines for neospora caninum in mice require challenge studies to demonstrate a reduction in clinical signs or prevention of vertical transmission of the parasite after vaccination. genetic susceptibility to n. caninum varies with the strain of mice. in this study, c57bl/6 mice were evaluated as a model for neospora vaccine studies. a lethal challenge model was developed and the ld(50) was determined to be 1.5 x 10(7)n. caninum tachyzoites/mouse, delivered intrape ...200717306460
does human proximity affect antibody prevalence in marine-foraging river otters (lontra canadensis)?the investigation of diseases of free-ranging river otters (lontra canadensis) is a primary conservation priority for this species; however, very little is known about diseases of river otters that forage in marine environments. to identify and better understand pathogens that could be important to marine-foraging river otters, other wildlife species, domestic animals, and humans and to determine if proximity to human population could be a factor in disease exposure, serum samples from 55 free-r ...200717347401
serological survey of neospora caninum in dogs in the czech republic and a long-term study of dynamics of antibodies.the main aim of the present study was to establish the prevalence of antibodies against neospora caninum dogs from the czech republic and to examine the dynamics of antibody titers during a long-term period. for this purpose, sera of 858 dogs were examined for the presence of anti-n. caninum antibodies using an indirect immunofluorescent antibody test (ifat). four groups of dogs of various origins were included in the survey: the first group (a, n=470) comprised dogs purchased by the czech army ...200716956728
host/parasite relationship in the in vitro infection of rat gliocytes by neospora caninum: evaluation of cell respiration.neospora caninum is a protozoon that causes abortion in cattle and neuromuscular lesions in dogs, with the formation of cysts mainly in the central nervous system. since n. caninum is an intracellular parasite with tropism for the cells of nervous system, this study evaluated the respiratory metabolism of glial cells infected by this* parasite. glial cultures obtained from the cerebral cortex of newborn rats were kept in dmem enriched with 10% fetal bovine serum, 1 mm pyruvic acid and 2 mm of l- ...200717184800
aetiology of bovine abortion in switzerland from 1986 to 1995--a retrospective study with emphasis on detection of neospora caninum and toxoplasma gondii by pcr.in a retrospective study, covering the period from 1986 to 1995, tissues of aborted fetuses were re-examined. a total of 347 cases were tested immunohistochemically, among them samples of 223 brains were examined for neospora caninum, toxoplasma gondii and bovine virus diarrhoea virus (bvdv), and 249 placentae for chlamydiaceae. two real-time pcr assays, one for n. caninum, and one for t. gondii, were developed. these potential abortion-inducing agents were detected - and confirmed by pcr, excep ...200717359449
comparative host-parasite relationships in ovine toxoplasmosis and bovine neosporosis and strategies for vaccination.toxoplasma gondii and neospora caninum are important causes of reproductive loss in ruminant species worldwide. both parasites cause disease during pregnancy that may result in foetal death or birth of live congenitally infected offspring. t. gondii is also an important human pathogen with the main risk groups including pregnant women and immuno-compromised individuals, although clinical disease has also been observed in outbreaks among immuno-competent people. while the two parasites are closel ...200717367899
study on the prevalence of toxoplasma gondii and neospora caninum and molecular evidence of encephalitozoon cuniculi and encephalitozoon (septata) intestinalis infections in red foxes (vulpes vulpes) in rural ireland.thoracic fluid (pleural fluid and clotted blood) from 206 foxes were examined for antibodies to toxoplasma gondii and 220 thoracic fluid samples were tested for neospora caninum antibodies using indirect immunofluorescent antibody tests (ifat). a total of 115 (56%) and six (3%) foxes had antibodies to t. gondii and n. caninum, respectively. the brains from 148 foxes were examined for histological lesions and pathological changes suggestive of parasitic encephalitis were observed in 33 (22%). two ...200717368946
peripheral immune responses in pregnant cattle following neospora caninum infection.experimental infection of cattle with neospora caninum in early gestation causes foetal death, but the foetus survives infection in late gestation. an immunological mechanism of abortion has been suggested; therefore changes in the maternal immune response during pregnancy could account for these differences. we have investigated the peripheral immune responses of pregnant cattle following an intravenous inoculation with 10(7) n. caninum tachyzoites in early and late gestation. percentages of cd ...200717371459
identification of ribosomal phosphoprotein p0 of neospora caninum as a potential common vaccine candidate for the control of both neosporosis and toxoplasmosis.the characterization of the cross-reactive antigens of two closely related apicomplexan parasites, neospora caninum and toxoplasma gondii, is important to elucidate the common mechanisms of parasite-host interactions. in this context, a gene encoding n. caninum ribosomal phosphoprotein p0 (ncp0) was identified by immunoscreening of a n. caninum tachyzoite cdna expression library with antisera from mice immunized with t. gondii tachyzoites. the ncp0 was encoded by a gene with open reading frame o ...200717412435
a longitudinal study of seroprevalence and seroconversion of neospora caninum infection in dairy cattle in northeast thailand.a long-term study was carried out in 11 dairy herds in the khon kaen province of northeast thailand between august 2001 and november 2004. the objective was to investigate seroprevalence dynamics of neospora caninum infection in the herds and to demonstrate patterns of seroconversion in individual cattle. each herd was visited once a year, in total four times, and sera from cattle > 3 months of age and farm dogs as well as a sample from the bulk milk were collected. all samples were analysed for ...200717416467
prevalence of neospora caninum and persistent infection with bovine viral diarrhea virus in dairy-breed steers in a feedlot.to determine the prevalence and effect of neospora caninum infection and persistent infection (pi) with bovine viral diarrhea virus (bvdv) on weight gain, morbidity, and mortality rate in dairy-breed steer calves located on a feedlot in california.200717397345
epidemiology and control of neosporosis and neospora caninum.neospora caninum is a protozoan parasite of animals. until 1988, it was misidentified as toxoplasma gondii. since its first recognition in dogs in 1984 and the description of the new genus and species neospora caninum in 1988, neosporosis has emerged as a serious disease of cattle and dogs worldwide. abortions and neonatal mortality are a major problem in livestock operations, and neosporosis is a major cause of abortion in cattle. although antibodies to n. caninum have been reported, the parasi ...200717428888
toxoplasma gondii dysregulates ifn-gamma-inducible gene expression in human fibroblasts: insights from a genome-wide transcriptional profiling.toxoplasma gondii is an obligate intracellular parasite that persists for the life of a mammalian host. the parasite's ability to block the potent ifn-gamma response may be one of the key mechanisms that allow toxoplasma to persist. using a genome-wide microarray analysis, we show here a complete dysregulation of ifn-gamma-inducible gene expression in human fibroblasts infected with toxoplasma. notably, 46 of the 127 ifn-gamma-responsive genes were induced and 19 were suppressed in infected cell ...200717404298
isolation and molecular detection of neospora caninum from naturally infected sheep from brazil.neospora caninum was isolated from a naturally infected sheep from brazil by bioassay in dogs. approximately 70g of brain from each of two 4-month-old sheep with indirect fluorescent antibodies (>or=1:50) to n. caninum was offered to a different ifat negative dog (sheep n. 302, ifat 1:400-dog 1 and sheep n. 342, ifat 1:50-dog 2). parasite dna was detected in both sheep brains using a pcr targeting the nc-5 gene of n. caninum. shedding of neospora-like oocysts was noticed only in dog 1, from 10 d ...200717451882
seroprevalence of antibodies to neospora caninum in urban and rural dogs in north-west italy.sera were collected from 490 dogs from north-west italy. one hundred and eighty-eight dogs were urban, while 302 dogs were rural. among the latter, 190 were shepherd dogs and 112 were cattle farm dogs. sera were tested for the presence of antibodies against neospora caninum using the neospora agglutination test. seroprevalence at 1/40, 1/80, 1/160 dilution titres was significantly higher in rural (36.4%, 19.5%, 9.9% respectively) than in urban dogs (20.2%, 10.6%, 4.8% respectively). seroprevalen ...200717456144
chronic neospora caninum infection and repeat abortion in dairy cows: a 3-year study.the serological status of neospora was monitored in animals older than 6 months in a dairy herd with a 3-year history of prevalent n. caninum and n. caninum-associated abortions. the numbers of animals in the herd tested each year of the study period were 259, 222 and 231, respectively. a separate analysis was performed on the 122 animals persisting in the herd for the 3 years. the overall seroprevalence of n. caninum in the herd decreased from 31.7% in the first year to 24.8% in the second year ...200717467905
induction of tachyzoite egress from cells infected with the protozoan neospora caninum by nitro- and bromo-thiazolides, a class of broad-spectrum anti-parasitic drugs.neospora caninum represents an important pathogen causing stillbirth and abortion in cattle and neuromuscular disease in dogs. nitazoxanide (ntz) and its deacetylated metabolite tizoxanide (tiz) are nitro-thiazolyl-salicylamide drugs with a broad-spectrum anti-parasitic activity in vitro and in vivo. in order to generate compounds potentially applicable in food and breeding animals, the nitro group was removed, and the thiazole-moiety was modified by other functional groups. we had shown earlier ...200717481636
seroprevalence of and agroecological risk factors for mycobacterium avium subspecies paratuberculosis and neospora caninum infection among adult beef cattle in cow-calf herds in alberta, canada.a province-wide cross-sectional seroprevalence and agroecological risk factor study of mycobacterium avium subspecies paratuberculosis (map) and neospora caninum (nc) infection among cattle in 100 cow-calf herds in alberta was conducted. the seroprevalence of map in adult cattle was 1.5% across all herds. using a widely accepted herd test cutpoint of 2 or more seropositive cows out of 30 animals tested, 7.9% of herds were estimated to be infected (95% confidence interval (ci): 2.3-23.4%). seropr ...200717494367
serosurvey of infectious disease agents of carnivores in captive red pandas (ailurus fulgens) in china.the future of the endangered red panda (ailurusfulgens) depends in part on the development of protective measures against infectious diseases. the present study is a first step toward improved understanding of infectious diseases in the species' home regions. serum samples obtained from 73 red pandas in 10 captive facilities in southwest, east, and northeast china from october to december 2004 were tested for antibodies against nine common infectious pathogens of carnivores. antibody titers agai ...200717469274
the ncgra7 gene encodes the immunodominant 17 kda antigen of neospora caninum.a neospora caninum 17-19 kda antigenic protein fraction (p17) in one-dimensional polyacrylamide gel electrophoresis (sds-page) is the immunodominant antigen recognized by sera from bovines naturally infected by n. caninum. to identify the proteins making up the p17 fraction, we screened a new n. caninum tachyzoite cdna library with an affinity-purified antibody against p17 (apa17). we isolated several cdna clones with 100% sequence identity to the ncgra7 gene. this previously described gene enco ...200717032479
serologic study of anti-neospora caninum antibodies in household dogs and dogs living in dairy and beef cattle farms in tehran, iran.a few studies have been done on the seroepidemiology of anti-neospora caninum antibodies in dairy and beef cattle farms in iran, which suggested the presence of n. caninum in these areas, but there is no published information directed on the presence or epidemiology of this organism in the dogs in iran. to investigate anti-n. caninum antibodies in household dogs and dogs living in cattle farms, 100 blood samples were collected: 50 from dogs living in dairy and beef cattle farms and 50 from house ...200717120042
pcr-rflp for the detection and differentiation of the canine piroplasm species and its use with filter paper-based technologies.canine piroplasmosis is an emerging disease worldwide, with multiple species of piroplasm now recognised to infect dogs. a nested polymerase chain reaction-restriction fragment length polymorphism (pcr-rflp) assay was developed for the detection and differentiation of each of the piroplasm species currently known to infect dogs on the basis of the 18s ribosomal rna gene. the assay can potentially amplify and discriminate between theileria annae, theileria equi, babesia conradae, babesia gibsoni, ...200717127005
neospora caninum emerges from the shadow of toxoplasma gondii.it is sometimes easy to make the mistake of assuming that everything that holds true for toxoplasma gondii is also true for its relative neospora caninum. however, a recurring theme in the recent review by hemphill et al. is not the similarities but the striking differences between the two parasites.200717185039
multimammate rat (mastomys natalensis), tristram's jird (meriones tristrami) and wagner's gerbil (gerbillus dasyurus) as laboratory models of acute neosporosis.to test the different sensitivity of rodents of the subfamily murinae and gerbillinae, wagner's gerbils (gerbillus dasyurus), tristram's jirds (meriones tristrami) and multimammate rats (mastomys natalensis) were inoculated with neospora caninum tachyzoites. clinical signs of neosporosis appeared in all inoculated animals. histopathological examination confirmed the presence of tachyzoites in brains, lungs, skeletal muscle, myocardium, liver, in serosa of stomach and intestines, and in vesicular ...200717134728
apical membrane antigen 1 is a cross-reactive antigen between neospora caninum and toxoplasma gondii, and the anti-ncama1 antibody inhibits host cell invasion by both parasites.the cross-reactive antigens of neospora caninum and toxoplasma gondii are important in the exploration to determine the common mechanisms of parasite-host interaction. in this study, a gene encoding n. caninum apical membrane antigen 1 (ncama1) was identified by immunoscreening of a n. caninum tachyzoite cdna expression library with antisera from mice immunized with recombinant t. gondii apical membrane antigen 1 (tgama1). ncama1 was encoded by an open reading frame of 1695 bp, which encoded a p ...200717156863
intrauterine neospora caninum inoculation of heifers and cows using contaminated semen with different numbers of tachyzoites.to investigate the potential of different neospora caninum tachyzoite doses to infect heifers (experiment 1) and cows (experiment 2) when administered in utero by artificial insemination via contaminated semen.200717126895
analysis of the immune response to neospora caninum in a model of intragastric infection in mice.to study experimental neospora caninum infection initiated at the gastrointestinal tract, toll-like receptor 4- and functional il-12rbeta2 chain-deficient c57bl/10 sccr mice were challenged intragastrically with 5 x 10(6) n. caninum tachyzoites. all parasite-inoculated mice eventually died with disseminated infection. in contrast, immunocompetent balb/c mice challenged with 1 x 10(7) n. caninum tachyzoites by the intragastric (i.g.) or the intraperitoneal (i.p.) route remained alive for at least ...200717187652
natural killer cells act as early responders in an experimental infection with neospora caninum in calves.the intracellular protozoan parasite neospora caninum is a cause of abortion and congenital disease in cattle worldwide. we have previously shown that natural killer (nk) cells produce ifn-gamma in response to n. caninum tachyzoites in vitro. this study aimed to investigate the role of nk cells and other cellular immune responses in an experimental n. caninum infection model in calves. phenotyping of peripheral blood lymphocytes showed a drop in the percentage of nk cells at days 4-6 after i.v. ...200717188277
structure-activity relationships from in vitro efficacies of the thiazolide series against the intracellular apicomplexan protozoan neospora caninum.nitazoxanide (2-acetolyloxy-n-(5-nitro 2-thiazolyl) benzamide; ntz) represents the parent compound of a novel class of broad-spectrum anti-parasitic compounds named thiazolides. ntz is active against a wide variety of intestinal and tissue-dwelling helminths, protozoa, enteric bacteria and a number of viruses infecting animals and humans. while potent, this poses a problem in practice, since this obvious non-selectivity can lead to undesired side effects in both humans and animals. in this study ...200717141783
immunization of cattle with live tachyzoites of neospora caninum confers protection against fetal death.neospora caninum is an obligate intracellular protozoan parasite that causes abortion in cattle. it is normally found as a latent infection controlled by a t-helper-cell type 1 response involving cd4(+) cytotoxic t cells and gamma interferon. cattle may be infected by two different routes: transplacentally as a result of activation of the latent infection in the mother causing congenital infection or abortion and by ingestion of oocysts, which, if it occurs during gestation, can also result in a ...200717145943
neospora caninum antibodies detected in midwestern white-tailed deer (odocoileus virginianus) by western blot and elisa.white-tailed deer (odocoileus virginianus) serve to maintain the neospora caninum life cycle in the wild. sera from white-tailed deer from south central wisconsin and southeastern missouri, usa were tested for antibodies to n. caninum by western blot analyses and two indirect elisas. seroreactivity against n. caninum surface antigens was observed in 30 of 147 (20%) of wi deer and 11 of 23 (48%) of mo deer using western blot analysis. compared to western blot, the two indirect elisas were found t ...200717194547
progesterone supplementation during mid-gestation increases the risk of abortion in neospora-infected dairy cows with high antibody titres.progesterone has been reported to reduce th1 responses during pregnancy. thus, given that an excessive th1 response could lead to abortion in neospora-infected dairy cows, we hypothesized a reduction in abortion risk following progesterone supplementation during the mid-gestation period in these animals. seropositive animals were assigned on day 120 of gestation to a control (n=33) or treatment (n=34) group. treatment consisted of progesterone supplementation by fitting a progesterone releasing ...200717182187
evaluation of bovine abortion associated with neospora caninum by different diagnostic techniques in mashhad, iran.twelve aborted foetuses (gestational ranged from 4-9 months) and dams from dairies cattle farms in (mashhad) iran were analysed to investigate the participation of neospora caninum in abortion. diagnosis of the infection was determined by histopathology, serology (indirect fluorescent antibody test [ifat]) and semi-nested polymerase chain reaction (pcr). a total 33% of bovine foetuses were considered to be infected by pcr technique. microscopic lesions consistent with n. caninum infection in foe ...200717206503
evaluation of four serological techniques to determine the seroprevalence of neospora caninum in foxes (vulpes vulpes) and coyotes (canis latrans) on prince edward island, canada.the objectives of this study were (1) to evaluate the performance and agreement of serological assays (elisa, ifat, neospora caninum agglutination test and immunoblot) using reference sera and field sera from foxes and coyotes and (2) to estimate the n. caninum seroprevalence in foxes and coyotes on prince edward island, canada. with fox and coyote reference sera the test performance of the elisa, ifat and ib was excellent (100% sensitivity and specificity). nat showed a low sensitivity (50%). s ...200717223270
risk factors for canine neosporosis in farm and kennel dogs in southern italy.neosporosis by neospora caninum causes losses to livestock production through abortion in cattle while, in dogs, it induces neuromuscolar disease. this study investigated neosporosis seroprevalence associated risk factors (including the seropositivity to leishmaniosis) in dogs of southern italy, determined the prevalence of n. caninum oocyst shedding and examined the relationship between seroprevalence of neosporosis in farm dogs and cattle. using an inhibition elisa, 20.9% of 306 dogs had perce ...200717257762
characterization of the fetuin-binding fraction of neospora caninum tachyzoites and its potential involvement in host-parasite interactions.terminal sialic acid residues on surface-associated glycoconjugates mediate host cell interactions of many pathogens. addition of sialic acid-rich fetuin enhanced, and the presence of the sialidiase inhibitor 2-deoxy-2,3-dehydro-n-acetylneuraminic acid reduced, the physical interaction of neospora caninum tachyzoites and bradyzoites with vero cell monolayers. thus, neospora extracts were subjected to fetuin-agarose affinity chromatography in order to isolate components potentially interacting wi ...200717291396
first report of neospora caninum-associated bovine abortion in mashhad area, iran.neospora caninum is an apicomplexan protozoan which causes abortion in cattle worldwide. the present study was designed to assess the importance of bovine neosporosis for causing abortion in iranian cattle. infection was primarily diagnosed by polymerase chain reaction (pcr), complemented with histopathology and immunohistochemistry (ihc). one hundred brains of aborted bovine fetuses were collected from iranian dairy herd between 2003 and 2005 in mashhad area. n. caninum was detected by pcr in t ...200717024355
antibodies to neospora caninum and toxoplasma gondii in domestic cats from brazil.the occurrence of antibodies to neospora caninum and toxoplasma gondii was determined in 400 domestic cats (siamese, persian, and undetermined breeds) from the municipality of araçatuba, sao paulo, brazil, through the indirect fluorescence antibody test (ifat). of the 400 cats, 100 were seropositive to t. gondii (25%, titer > or =64) and 98 to n. caninum (24.5%, titer > or =16). the rate of seropositive cats for t. gondii was correlated with age (chi(2)=35.7; p<0.001), with a higher number of in ...200716941188
survey of neospora caninum and bovine herpes virus 1 coinfection in cattle.a seroprevalence survey of neospora caninum and bovine herpesvirus 1 (bhv-1) was conducted in cattle pasturing in an area of the southern italian apennines to investigate the coinfection of these two pathogens. blood samples were collected from 948 pastured cattle raised on 81 farms. sera were tested for antibodies to n. caninum and to bhv-1 using an elisa assay and a neutralization test, respectively. out of the 81 farms sampled, 63 (77.8%) were positive for n. caninum and 80 (98.8%) for bhv-1. ...200717053931
seroprevalence of neospora caninum in non-carnivorous wildlife from spain.serum samples from 1034 non-carnivorous wildlife from spain were tested for antibodies to neospora caninum by competitive screening enzyme linked immunosorbent assay (elisa) and confirmed by an indirect fluorescent antibody test (ifat). high agreement was observed between results in both techniques (kappa value higher than 0.9). prevalences of n. caninum antibodies positive by both techniques were 11.8% of 237 red deer (cervus elaphus), 7.7% of 13 barbary sheep (ammotragus lervia), 6.1% of 33 ro ...200716962706
neospora caninum detected in feral rodents.the role of rodents in the epidemiology of neosporosis was investigated by assaying brain tissue of feral mice (mus musculus) and rats (rattus norvegicus) for neospora caninum. both mouse and rat brain tissue were extracted for total dna, and subjected to two different n. caninum-specific nested polymerase chain reaction (pcr) assays. a portion of brain tissue from the mice and rats were also assayed for n. caninum in gerbils or gamma-interferon gene knockout (ko) mice. of the 105 feral mice tes ...200716997474
evaluation of serological tests for the diagnosis of neospora caninum infection in dogs: optimization of cut off titers and inhibition studies of cross-reactivity with toxoplasma gondii.diagnosis of neospora caninum infection in dogs is based on serological assays such as the indirect fluorescent antibody test (ifat) and enzyme-linked immunosorbent assays (elisa). this study evaluated two serological tests (ifat and elisa) for the detection of igg antibodies to n. caninum in 300 serum samples of dogs through the optimization of cut off titers by using the two-graph receiver-operating characteristic (tg-roc) curve. in addition, the identification of major cross-reactive antigens ...200716973287
plasma pregnancy-associated glycoprotein-1 (pag-1) concentrations during gestation in neospora-infected dairy cows.the aim of this study was to determine whether plasma pregnancy-associated glycoprotein-1 (pag-1) concentrations in pregnancy are affected by persistent neospora caninum infection in dairy cows. the data analyzed were derived from 22 multiparous cows: 16 n. caninum-seropositive and 6 n. caninum-seronegative animals (used as controls). three of the 16 seropositive cows aborted during the study period and the corresponding data were analyzed separately. pregnancy diagnoses were performed on day 40 ...200717010415
seroepidemiology of neospora caninum and toxoplasma gondii in cattle and water buffaloes (bubalus bubalis) in the people's republic of china.a seroepidemiological survey of neospora caninum and toxoplasma gondii in cattle and water buffaloes was carried out in the people's republic of china. serum samples were obtained from dairy (n=262, 9 herds in 9 provinces) and beef cattle (n=10, 1 herd) and water buffaloes (n=40) in china. all sera were tested for antibodies to n. caninum and t. gondii by an enzyme-linked immunosorbent assay (elisa) and an indirect agglutination test (iat), respectively. the overall seroprevalence of n. caninum ...200717010521
the first detection of neospora caninum dna in the colostrum of infected cows.limited data is available on the vertical transmission of neospora caninum via the colostrum. the results of our previous research revealed the presence of n. caninum dna in the milk of seropositive cows. the aim of the present work is to demonstrate parasite dna in colostrum samples. a polymerase chain reaction using np21 and np6 primers was applied to dna isolated from the colostrum sediment in order to amplify the corresponding genomic nc-5 region. the expected 328-bp product was obtained in ...200717024360
neospora caninum: high susceptibility to the parasite in c57bl/10sccr mice.c57bl/10sccr mice, lack toll-like receptor 4 and a functional interleukin-12 receptor. taking this into account, susceptibility of these mice to neospora caninum infection was assessed comparatively to that of immunocompetent c57bl/10scsn mice. c57bl/10sccr mice inoculated intraperitoneally with 5x10(5)n. caninum tachyzoites showed a high susceptibility to this parasite. all infected c57bl/10sccr mice were dead by day 8 post-infection whereas all control c57bl/10scsn mice survived this parasitic ...200716889774
generation of parasite cysts in cultured cells instead of living animals.in order to develop any effective means of prevention or therapy against neospora caninum infection, all three life cycle stages of this parasite have to be taken into account. in this project, the in vitro culture of n. caninum bradyzoites containing tissue cysts has been developed, thus allowing to the initiation of stage conversion without the use of animal experimentation. this enables researchers to study novel aspects of stage differentiation, to investigate novel diagnostic antigens, and ...200719835051
seroprevalence of neospora caninum antibodies in cattle and water buffaloes in india.neospora caninum is now recognized as a major cause of abortion in cattle worldwide, but there is no report of n. caninum infection in cattle in india. serum samples from 427 dairy cattle and 32 dairy water buffaloes from 7 organized dairy farms located in punjab, india, were tested for n. caninum antibodies using a commercial monoclonal antibody-based competitive enzyme-linked immunosorbent assay (elisa). antibodies to n. caninum were found in 35 of 427 cattle from 6 of the 7 farms; 9.6% of cow ...200718314683
serosurvey of ex situ giant pandas (ailuropoda melanoleuca) and red pandas (ailurus fulgens) in china with implications for species conservation.conservation strategies for the giant panda (ailuropoda melanoleuca) include the development of a self-sustaining ex situ population. this study examined the potential significance of infectious pathogens in giant pandas ex situ. serologic antibody titers against canine distemper virus (cdv), canine parvovirus (cpv), canine adenovirus (cav), canine coronavirus (ccv), canine herpesvirus, canine parainfluenza virus (cpiv), toxoplasma gondii, neospora caninum, and leptospira interrogans were measur ...200718229861
if control of neospora caninum infection is technically feasible does it make economic sense?recent work on neospora caninum, a protozoan parasite that causes abortions in dairy cattle has focused on a number of different control options. modelling has suggested the most effective options for control but the present paper argues that the most effective option might not necessarily be optimal from an economic point of view. decision trees, using published quantitative data, were constructed to choose between four different control strategies. the costs of these interventions, such as 'te ...200616893606
[search for neospora caninum dna in bull semen using pcr ].neospora caninum represents one of the most frequent abortifaciant organisms worldwide. the parasite is diaplacentally transmitted from the pregnant cow to the fetus, where it normally leads to the delivery of a healthy, however persistently infected calf. abortion thus is a relative rare event. the transmission of bovine neosporosis occurs in more than 90% of the cases vertically due to the endogenous reactivation of a persistently infected mother. exogenous infections are therefore responsible ...200617024977
variations of neospora caninum antibody levels in milk during lactation in dairy cows.a longitudinal study was performed to investigate the variations of neospora caninum antibody levels in individual milk during lactation as well as the association between antibody levels in serum and milk. serum and milk samples of 15 milking cows were collected between february 2003 and september 2004 in three smallholder dairy farms in khon kaen province in northeast thailand. all samples were analyzed for presence of antibodies by an n. caninum iscom elisa test kit and the results were given ...200616842923
characterization of the immune response in the placenta of cattle experimentally infected with neospora caninum in early gestation.a serial examination of three groups of cattle infected intravenously (iv) (group 1, n=8) or subcutaneously (sc) (group 2, n=8) with live neospora caninum tachyzoites or with vero cells (group 3, n=8) at 70 days' gestation was carried out and the nature of the inflammatory responses in the placenta and the presence of parasite antigen were analysed. immune cells expressing cd3, cd4, cd8, gamma delta (gammadelta) t-cell receptors (tcr), cd79alpha cytoplasmic (cy) (b cells) and nkp46 [natural kill ...200616997005
comparison of neospora caninum distribution, parasite loads and lesions between epidemic and endemic bovine abortion cases.it has been suggested that the abortion herd pattern could influence bovine foetal neosporosis. here, a comparison of (i) neospora caninum dna-detectability by pcr, (ii) n. caninum-associated lesions and (iii) parasite loads in target organs was made between epidemic and endemic abortion cases. we observed that n. caninum dna was predominantly detected in more than one organ in the foetuses from herds with epizootic rather than endemic abortion cases (p<0.05, fisher f-test). the highest parasite ...200616884852
[distribution of anti-neospora caninum antibodies in dairy cows at municipalities of resende and rio claro in the state of rio de janeiro, brazil].this study aimed to verify the prevalence of anti-neospora caninum antibodies in dairy cows from municipalities of resende and rio claro, both located at sulfluminense dairy belt. a total of 29 farms from resende and 28 from rio claro were randomly selected. to evaluate the association between herds and animals against the etiological agent χ² tests were used. seventy eight animals at resende (25.74%, confidence intervals(ic) at 95%: 15.7-25.8%) had anti-n. caninum antibodies, while 53 animals ( ...200616978473
[prevalence of antibodies anti-neospora caninum in bovines from anápolis and goiânia microregions, goiás, brazil].the prevalence of antibodies anti-neospora caninum in bovines was determined in 21 farms from anápolis and goiânia microregions, in goiás, brazil. out of these 11 were dairy farms (holstein and crossbred holstein-zebu), nine had beef cattle (nelore) and one was for mixed exploitation (simental). blood samples were collected from 930 animals, and sera obtained were separated and stored at -20 degrees c. serum samples were examined by the immunofluorescent antibody technique (ifat), using tachyzoi ...200616978474
prevalence of anti-neospora caninum antibodies in cattle and dogs from western amazon, brazil, in association with some possible risk factors.for evaluation of the prevalence of anti-neospora caninum antibodies and its associated risk factors, serum samples from 2109 cattle (11 beef, 50 dairy and 25 mixed farms) and 174 dogs were examined in the state of rondônia, western amazon, brazil. an inquiry was applied in each farm. sera were examined by the indirect fluorescence antibody test (ifat) using cut off dilution of 1:25 for cattle and 1:50 for dogs. statistical association between the serologic status and several variables were anal ...200616857319
financial analysis of various strategies for the control of neospora caninum in dairy cattle in switzerland.the present study was conducted to estimate the direct losses due to neospora caninum in swiss dairy cattle and to assess the costs and benefits of different potential control strategies. a monte carlo simulation spreadsheet module was developed to estimate the direct costs caused by n. caninum, with and without control strategies, and to estimate the costs of these control strategies in a financial analysis. the control strategies considered were "testing and culling of seropositive female catt ...200616982104
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