studies on endoparasites of the black bear (ursus americanus) in the southeastern united states.examination of 53 black bears (ursus americanus) from six states in the southeastern united states revealed at least 17 species of endoparasites, including sarcocystis sp., spirometra mansonoides (spargana), macracanthorhynchus ingens, ancylostoma caninum, arthrocephalus lotoris, baylisascaris transfuga, capillaria aerophila, capillaria putorii, crenosoma sp., cyathospirura sp., dirofilaria immitis, gnathostoma sp., gongylonema pulchrum, microfilariae, molineus barbatus, physaloptera sp. and str ...1978418189
helminths recovered from black bears in the peace river region of northwestern alberta.a total of 91 free-ranging black bears (ursus americanus) from the peace river region of northwestern alberta was examined for helminths. four species, baylisascaris transfuga, taenia krabbei, taenia hydatigena and dirofilaria ursi, were found. none of the bears was heavily infected. results are compared with other similar north american surveys.1979459048
seasonal changes in the prevalence of ova of diphyllobothrium ursi and baylisascaris transfuga in the feces of the black bear (ursus americanus).an analysis of 114 samples of feces from black bears (ursus americanus) from la verendrye park, quebec revealed that the prevalence of eggs of diphyllobothrium ursi and baylisascaris transfuga varied seasonally. d. ursi ova were most prevalent during the summer and fall and at their lowest in spring while the converse was true for b. transfuga. this phenomenon possibly is associated with the cessation of feeding during the winter denning of black bears.1978567699
helminth parasites of fisher martes pennanti (erxleben) from manitoba, species of helminths were recovered during a survey of 162 fisher (martes pennanti) from four areas of manitoba: baylisascaris devosi in 52 fisher; taenia sibirica in 25; physaloptera sp. in nine; alaria mustelae in two; metorchis conjunctus in one; trichinella spiralis in one of 81; molineus sp. in one. b. devosi was the most prevalent parasite and differences in its geographical distribution were possibly related to population density of fisher. the prevalence of other parasites did not ...1979574167
ecto- and endoparasites of the black bear in northern wisconsin.parasites collected from free-ranging black bears, ursus americanus, in northern wisconsin included dermacentor variabilis, d. albipictus, ixodes scapularis, demodex sp., trichodectes pinguis euarctidos, baylisascaris transfuga and dirofilaria ursi. mange, possibly caused by the demodex sp., also was observed. dental caries were common and periodontal disease was observed in one animal.1978633522
baylisascaris procyonis for testing anthelmintics against migratory ascarids.oral inoculation of mice with 340 embryonated eggs of the nematode, baylisascaris procyonis, proved uniformly fatal as early as 13 days after inoculation and as late as 48 days. mice given either 0.5% or 0.25% of pyrantel tartrate in dry feed were protected from cerebral migrations of the worm for 55 days. treatment with pyrantel pamoate in the feed at the concentration of 0.2% given 7 days before inoculation and 5 days after inoculation also protected mice from migrations throughout the 55-day ...1978736349
chemotherapy of helminthiasis among wild mammals. ii. baylisascaris transfuga (rudolphi, 1819) sprent, 1968 infection of polar bear.effective chemotherapy by mebendazole of baylisascaris transfuga infection of five polar bears is reported and a control measure programme directed towards limiting the infection under the prevailing condition is discussed.19761015484
parasites of black bears of the lake superior region.parasites collected from free-ranging black bears, ursus americanus pallas, 1780, from northeastern minnesota or northern michigan include the dog tick, dermacentor variabilis (say, 1821), the winter tick, d. albipictus (packard, 1869), a louse, trichodectes pinguis euarctidoes hopkins, 1954, an ascarid worm, baylisascaris transfuga (rudolphi, 1819), a filarial worm, dirofilaria ursi yamaguti, 1941, taeniid tapeworms, and unidentified fleas. the broad fish tapeworm, diphyllobothrium latum (linna ...19751142551
[ocular manifestations of selected zoonoses in humans].a report is given on the epidemiology and clinical signs of some selected zoonoses that may be of significance for ocular infections in man: brucellosis, leptospirosis, lyme borreliosis, lymphocytic choriomeningitis, newcastle disease, ornithosis (chlamydiosis), rabies, streptococcus suis infection, larva migrans ocularis by toxocara canis or baylisascaris procyonis, toxoplasmosis and tularemia.19921412422
encephalitis in two porcupines due to baylisascaris larval migration. 19911760473
cerebrospinal nematodiasis caused by baylisascaris procyonis in chinchillas. 19912039793
experimental infection in mice with larvae of baylisascaris transfuga (nematoda).b. transfuga larvae migrated in livers, lungs and brains of experimentally infected mice. b. transfuga larvae have never been reported as etiologic agents of visceral larva migrans, but our results show that they have a migration in experimental paratenic hosts of a type that suggests their possible role in this syndrome.19902085208
helminth parasitism in martens (martes americana) and ermines (mustela erminea) from washington, with comments on the distribution of trichinella spiralis.helminths are reported for the first time from ermines (mustela erminea) and martens (martes americana) in washington (usa). among 22 adult ermines, 41% were infected by one or more of five species (taenia mustelae, alaria mustelae, molineus patens, m. mustelae and trichinella spiralis). among 78 adult martens from three geographic localities, the prevalence was 83%. nine species were identified (mesocestoides sp., t. mustelae and t. martis americana, euryhelmis squamula, m. patens, baylisascari ...19902250320
prevalence of patent baylisascaris procyonis infection in raccoons (procyon lotor) in ithaca, new york.the prevalence of patent baylisascaris procyonis infection in raccoons was determined by examining fecal samples collected between july 1986 and may 1987 in ithaca, new york. september, october, and november had the highest prevalence of infection (35-48%). significant differences (p less than 0.001) were found when months were grouped by season to test the hypothesis that a fecal sample's probability of being positive does not vary from month to month. fall was the season contributing most to t ...19892614599
immunofluorescent localization of eosinophil granule major basic protein in fatal human cases of baylisascaris procyonis infection.we examined eosinophil degranulation in tissues from patients infected with baylisascaris procyonis as shown by the extracellular deposition of granule major basic protein (mbp). we utilized immunofluorescence to localize mbp in eosinophils and at sites of degranulation to study specimens from 2 fatal cases of b. procyonis infection. large numbers of intact eosinophils were present in the brain around blood vessels and necrotic migration tracks and in mesenteric granulomata. extensive extracellu ...19892648884
physicochemical characterization and monoclonal and polyclonal antibody recognition of baylisascaris procyonis larval excretory-secretory antigens.baylisascaris procyonis larval excretory-secretory (es) antigens consisted of complex glycoproteins ranging from 10 kda to over 200 kda as determined by sodium dodecyl sulfate polyacrylamide gel electrophoresis and lectin binding. five monoclonal antibodies (bapr1-bapr5) produced against b. procyonis es antigens were assayed by western blotting with larval es antigens from b. procyonis, baylisascaris melis, baylisascaris transfuga, ascaris suum, and toxocara canis. bapr1 and bapr2 recognized per ...19892668490
baylisascaris larva migrans. 19892676929
scanning electron microscopic observations of adult baylisascaris procyonis (nematoda).the scanning electron microscope was used to illustrate the microtopographic features of the caudal end of adult male baylisascaris procyonis. the male tail was relatively long, smoothly attenuated and often had a small button-like or mucronate termination. the preanal papillae were situated ventrally in two slightly divergent and somewhat irregularly spaced rows. anterior and posterior to the anus were two slightly raised roughened patches consisting of several rows of small spines. just anteri ...19892777474
occurrence of baylisascaris procyonis in raccoon populations on military installations in the washington, d.c. area. 19873103024
biochemical and immunological systematics of some ascaridoid nematodes: genetic divergence between congeners.vertical starch gel electrophoresis and trefoil immunodiffusion were used to study the systematics of some ascaridoid nematodes. within the ascarididae, the time scale of divergence was too great for intergeneric electrophoretic comparisons. congeneric electrophoretic comparisons of baylisascaris procyonis (host--raccoon) versus baylisascaris transfuga (host--black bear), and toxocara canis (host--domestic dog) versus toxocara cati (host--domestic cat) yielded nei genetic distance coefficients o ...19873114467
toxocara canis: monoclonal antibodies to larval excretory-secretory antigens that bind with genus and species specificity to the cuticular surface of infective larvae.when maintained in culture, the infective-stage larvae of toxocara canis produce a group of excretory-secretory antigens. monoclonal antibodies to these antigens have been produced and partially characterized. hybridomas were made using spleens from mice that had been given 250 embryonated eggs of t. canis followed by immunization with excretory-secretory antigens. monoclonal antibodies were first screened against excretory-secretory antigens using an indirect enzyme-linked immunosorbent assay. ...19873315735
encephalomyelitis in a dog caused by baylisascaris infection. 19883344574
comparative analysis of larval excretory-secretory antigens of baylisascaris procyonis, toxocara canis and ascaris suum by western blotting and enzyme immunoassay. 19883366527
cerebrospinal nematodiasis in prairie dogs from a research facility.baylisascaris spp larvae were determined to cause cns disease in 3 prairie dogs maintained at a research facility. clinical signs consisted of ataxia, stumbling, and head tilt, which progressed to severe torticollis, paddling in lateral recumbency, and loss of the righting reflex. gross lesions were not found at necropsy. microscopically, the cerebellar white matter and medulla oblongata were most severely affected and had numerous sections of large ascarid larvae. our findings indicated that na ...19883403358
diagnostic morphology of four larval ascaridoid nematodes that may cause visceral larva migrans: toxascaris leonina, baylisascaris procyonis, lagochilascaris sprenti, and hexametra leidyi.the gross and histological morphology of the larvae of 4 ascaridoid nematodes, toxascaris leonina, baylisascaris procyonis, lagochilascaris sprenti, and hexametra leidyi, are described. the larvae of t. leonina, b. procyonis, and l. sprenti were recovered from experimentally infected mice at 32, 14, and 75 days of infection, respectively. hexametra leidyi larvae used for morphological study were collected on day 159 postinfection from a rhesus monkey, macaca mulatta, while h. leidyi larvae used ...19873437356
helminths of the raccoon (procyon lotor) in western kentucky.seventy raccoons (procyon lotor) from western kentucky were examined for helminths from december 1985 through may 1986. twenty-three species of helminths were collected including 10 species of trematoda (brachylaima virginiana, euryhelmis squamula, eurytrema procyonis, fibricola cratera, gyrosoma singulare, maritreminoides nettae, mesostephanus appendiculatoides, metagonimoides oregonensis, paragonimus kellicotti, pharyngostomoides procyonis), 2 species of cestoda (atriotaenia procyonis, mesoces ...19873625429
cerebrospinal nematodiasis in pheasants.infection with larvae of baylisascaris procyonis, the raccoon ascarid, was the cause of neurologic disease affecting young pheasants on a commercial pheasant ranch in wisconsin. the disease was chronic and insidious, affecting 1% to 2% of the birds over a period of 2 years. histologic lesions in the brain consisted of multifocal areas of necrosis and inflammation associated with baylisascaris larvae. onset of the disease at the farm correlated with introduction of chopped straw as bedding for th ...19863793586
fatal eosinophilic meningoencephalitis and visceral larva migrans caused by the raccoon ascarid baylisascaris procyonis. 19854039793
the relationship of baylisascaris procyonis to illinois raccoons (procyon lotor).the gastrointestinal tracts of 310 steel-trapped or hunter shot illinois raccoons (procyon lotor) were collected in november and december 1979 and 1980 and examined for the presence of baylisascaris procyonis (nematoda) in order to determine the prevalence and intensity of this ascarid and to note any differences with respect to host age and sex. the raccoons were classified as either juveniles (animals less than 1 yr old) or adults. the prevalence for all the raccoons examined was 81.9% and is ...19854057003
the raccoon ascarid. a probable cause of human ocular larva migrans.the ability of raccoon roundworm larvae, baylisascaris procyonis, to produce ocular larva migrans (olm) was studied in various experimental animals. in addition, the clinical and pathologic lesions were compared to those in suspected cases of human ocular baylisascariasis, in patients with diffuse unilateral subacute neuroretinitis (dusn). ocular larva migrans was produced in squirrel monkeys, cynomolgus monkeys, mice, hamsters, grey squirrels, and woodchucks orally infected with b. procyonis eg ...19854088627
observations on migratory behaviour and development of baylisascaris tasmaniensis. 19734724424
demonstration of larval forms of baylisascaris tasmaniensis in the wombat (vombatus ursinus). 19744844507
notes on ascaris and toxascaris, with a definition of baylisascaris gen.nov. 19684868445
raccoon ascarid larvae (baylisascaris procyonis) as a cause of ocular larva migrans.larvae of the common raccoon roundworm, baylisascaris procyonis, are known causes of visceral larva migrans and cns disease in animals and human beings. in the present experiments we examined the ability of b. procyonis to cause ocular larva migrans (olm) in subhuman primates, as an indication of its possible ocular zoonotic importance. squirrel monkeys given 5,000 or 10,000 infective b. procyonis eggs per os and cynomolgus monkeys given 20,000 eggs had clinical and histologic evidence of olm, b ...19846541214
jejunal obstruction due to baylisascaris procyonis in a raccoon. 19846542558
case 4. the first fatal baylisascaris infection in humans: an infant with eosinophilic meningoencephalitis.baylisascaris procyonis, the ascarid of raccoons, causes a characteristic, rapidly fatal eosinophilic meningoencephalitis with ocular involvement in many naturally and experimentally infected aberrant hosts, including monkeys. warnings that humans are potentially susceptible to the devastating infection have been issued, but an instance in humans has not been recognized. this report describes a boy who died from an eosinophilic meningoencephalitis, which mimicked b. procyonis infection in monkey ...19846542658
experimental cerebrospinal nematodiasis due to baylisascaris procyonis in chickens.avian cerebrospinal nematodiasis was studied in chickens experimentally inoculated with infective eggs of baylisascaris procyonis of raccoon origin. birds each received 3,200, 1,600, 800, 400, 200, or 0 eggs, one dose per group of 10 birds. central nervous system (cns) disease developed in 17 of the 50 infected birds. birds receiving the higher dosages exhibited the worst clinical signs, had higher mortality rates, lived for shorter duration, and had the most severe brain lesions. onset of cns d ...19836682655
improved method for recovering ascarid and other helminth eggs from soil associated with epizootics and during survey studies.two noncentrifugal and 5 centrifugal flotation methods for the recovery of infective baylisascaris procyonis eggs from contaminated soil were evaluated after an epizootic of fatal cerebrospinal nematodiasis in bobwhites. all involved the use of inexpensive, readily available materials and routine procedures. in all but 1 of the methods, sizes of the soil samples were 30 g; in 1 centrifugal method, the sample size was 1 g. the centrifugal methods included various combinations of (i) anionic deter ...19836683477
encephalitis caused by baylisascaris migration in a silver fox. 19836685718
experimental infection of domestic swine with baylisascaris procyonis from raccoons.six 8-week-old ascarid-naive pigs which were experimentally infected with 72,000 embryonated baylisascaris procyonis eggs of raccoon origin developed lesions limited to the intestines and liver. intestinal lesions consisted of multifocal areas of inflammation by macrophages, eosinophils, and lymphocytes in the mucosa and submucosa, in association with baylisascaris larvae; similar lesions were seen in the mesenteric lymph nodes. typical white, granulation type, multifocal interstitial hepatitis ...19846742572
helminth parasites of pine marten, martes americana (turton), from manitoba, canada.five species of helminths were recovered during a survey of 139 north american pine marten (martes americana) from three areas of manitoba: alaria taxideae in 75 marten; taenia sp. (cf. martis martis) in 16; taenia mustelae in nine; baylisascaris devosi in one; trichinella sp. larvae in one. taenia mustelae and taenia sp. (cf. martis martis) were found in two different areas of the province, taenia sp. (cf. martis martis) being isolated from the more northerly regions. alaria taxideae, the most ...19836842730
scanning electron microscopy of the labia of baylisascaris procyonis (nematoda).the labial organization of adult baylisascaris procyonis was studied by scanning electron microscopy, and found to be similar for males and females. the apical part of each lip was smooth, and the basal part reticulated. the dorsal lip possessed two dorsolateral double papillae and two internal labial papillae; the two subventral lips each had one ventrolateral double and one externolateral papilla, two internal labial papillae, and an amphid. the small papilla of each double set was dome-shaped ...19826889644
prevalence of eggs of baylisascaris procyonis (nematoda:ascaroidea) in raccoon scats from an urban and a rural community.twenty-six of 97 (27%) scats from raccoons (procyon lotor) in an urban area and 37 of 121 (31%) scats from raccoons collected in a rural area of indiana during october and november of 1980 contained eggs of baylisascaris procyonis, an ascarid of animal health significance. raccoons that were livetrapped from the same areas had similar prevalences of b. procyonis eggs in their feces. therefore, monitoring the prevalence of b. procyonis in raccoon populations by analyzing scats appeared to be feas ...19826891409
parasitic encephalitis due to baylisascaris sp. in wild and captive woodchucks (marmota monax).twelve of 102 woodchucks submitted for necropsy to the new york state college of veterinary medicine had clinical histories of central nervous system disorder. all had multifocal eosinophilic encephalitis with formation of granulomas. nematode larvae, identified as baylisascaris sp. were found in six of the 12 and were assumed to be the etiologic agent in all affected woodchucks. both wild and captive (wild-trapped) woodchucks were affected, and all occurrences were between mid-june and early se ...19827147625
baylisascaris procyonis and eimerian infections in raccoons.twenty-eight raccoons from columbus, ohio, were surveyed for intestinal parasites. baylisascaris procyonis was found in 7, trichurid eggs in 2, capillarid eggs in 8, trichostrongyloid eggs in 9, and eimeria procyonis oocysts in 23. meronts, gamonts, and oocysts of e procyonis were found in epithelial cells at the tips of the villi of small intestine. meronts were 7 x 5.5 microns and contained 4 to 10 merozoites which were 5 x 1.5 microns. male gamonts were 15.5 x 11.7 microns and contained numer ...19827174446
cerebrospinal nematodiasis and visceral larva migrans in an australian (latham's) brush turkey.cerebrospinal nematodiasis and visceral larva migrans were diagnosed in an australian (latham's) brush turkey (alectura lathami) that died at the indianapolis zoo following a progressive neurologic disease. histologically, multifocal areas of malacia, necrosis, and inflammation were seen in sections of cerebrum, cerebellum, and midbrain; lesions were most severe in the cerebellum. a large granuloma in a lung contained cross sections of a large ascarid larva identified as baylisascaris. the cns l ...19827174447
[cerebral nematode infection in nutria (myocastor coypus)--caused by larvae of baylisascaris (nematoda)]. 19817195198
raccoon ascarid larvae as a cause of fatal central nervous system disease in subhuman assess the danger of baylisascaris procyonis (the common roundworm of raccoons) to subhuman primates, as well as the zoonotic potential of the parasite, 4 squirrel monkeys were inoculated by stomach tube with 5,000 or 10,500 infective b procyonis eggs. fulminating severe cns disease developed at 10-15 days after inoculation, and the monkeys died or were euthanatized at 12-19 days. at necropsy, numerous hemorrhagic migration tracks were visible in coronal brain slices. histologically, numerous ...19817199033
cerebrospinal nematodiasis in a woodchuck suspected of having rabies.a young woodchuck (marmota monax) with a history of cns dysfunction and abnormal behavior was submitted frozen to the animal disease diagnostic laboratory, purdue university, as a rabies suspect. the woodchuck was negative for rabies by the fluorescent antibody test. histologically, multifocal areas of necrosis, malacia, and inflammation were seen in sections of cerebrum, midbrain, and cerebellum, accompanied by marked perivascular cuffing with eosinophils and lymphocytes. sections of lung conta ...19817199034
verminous encephalitis in commercial outbreak of fatal encephalitis in four-week-old chickens is described. the causal agent was shown to be baylisascaris procyonis, the common roundworm of raccoons.19807436967
encephalitic nematodiasis in a douglas squirrel and a rock dove ascribed to baylisascaris procyonis. 19957497427
meiosis and some aspects of cytological mechanisms of chromosomal sex determination in nematode species.meiotic division in toxascaris leonina, baylisascaris transfuga, hexametra sp., toxocara canis, t. cati, heterakis gallinarum and physaloptera clausa of the class nematoda were studied. chromosomal sex determination type in different taxa is described. the xx-xo type of sex determination predominates in the species examined. a y chromosome occurs only in b. transfuga. a correlation between the number and length of sex chromosomes and autosomes in the different taxa was established.19957635621
visceral larva migrans in mice experimentally infected with baylisascaris transfuga (ascarididae: nematoda).laboratory bred albino mice, weighing 20 to 25 g, were orally infected with 2000 baylisascaris transfuga infective eggs each. mice were randomly chosen and sacrificed on days 1, 2, 3, 10, 15, 24 and 70 post-infection. samples of intestine, mesenteric lymph nodes, liver, lungs, heart, spleen, kidneys, uterus, brain and skeletal muscles were collected and processed for conventional histopathology. in the early infection the major necropsy findings were focal haemorrhages on the intestinal wall, li ...19947638005
baylisascaris sp. infection in a guinea pig. 19957650907
cerebral larva migrans caused by baylisascaris sp in pet rabbits.cerebral larva migrans was diagnosed histologically in 4 pet rabbits that developed progressive neurologic disease. larvae of baylisascaris sp were isolated from brain tissues in 2 rabbits. the clinical syndrome of progressive torticollis and ataxia manifested by these rabbits is commonly associated with otitis and labyrinthitis attributable to bacterial infection; however, the middle ears were normal on radiographic and postmortem examinations. the severe encephalopathy that developed in these ...19947744648
cerebrospinal larva migrans due to baylisascaris procyonis in a guinea pig colony.four guinea pigs from a colony of approximately 50 animals were examined for progressive neurologic disease of 5 days' duration. signs of neurologic dysfunction included cachexia, stupor, hyperexcitability, lateral recumbency, and opisthotonos. results of gross pathologic, microbiologic, and serologic examinations were unremarkable. histologic examination of cerebral and cerebellar sections revealed multifocal malacia and regions of eosinophilic granulomatous inflammation. cross-sections of nema ...19957752610
diagnosis and management of baylisascaris procyonis infection in an infant with nonfatal meningoencephalitis.baylisacaris procyonis, the common raccoon ascarid, is known to cause life-threatening visceral, neural, and ocular larva migrans in mammals and birds. two human fatalities have been previously described; however, little is known about the spectrum of human disease caused by b. procyonis. in this report, the case of a 13-month-old child who had nonfatal meningoencephalitis secondary to b. procyonis infection is presented. the suspected diagnosis was confirmed with use of newly developed enzyme i ...19948086545
observations on the infectivity of baylisascaris transfuga eggs for investigate the potential pathogenicity of baylisascaris spp. nematodes, mice were experimentally infected with baylisascaris transfuga eggs, which had been cultured in 0.1 n sulphuric acid, for a period in excess of 1 year. infectivity for mice appeared after 2 weeks in cultures (2.8%), peaked after 4 weeks (37.4%) and then waned over the next 18 months. the implications of b. transfuga as a possible agent of visceral larva migrans in animals and humans was demonstrated.19948171831
helminths of the black bear, ursus americanus, in new brunswick.between may 1989 and october 1991, 544 black bears ursus americanus were collected in new brunswick and examined for trichinella spiralis larvae. in addition, 110 of these bears were examined for filarial nematodes, and the entire intestinal tracts of 12 bears were examined for intestinal helminths. four species of helminths were identified from these bears, including trichinella spiralis, dirofilaria ursi, baylisascaris transfuga, and taenia krabbei. this represents the first documentation of t ...19948195953
diffuse unilateral subacute neuroretinitis. morphometric, serologic, and epidemiologic support for baylisascaris as a causative agent.several nematodes have been postulated as etiologic agents in diffuse unilateral subacute neuroretinitis (dusn), but the cause of this condition remains uncertain. the authors report the first case of dusn from the western united states (northern california), along with morphometric, serologic, and epidemiologic evidence supporting baylisascaris procyonis as its cause.19938233397
experimental infection in chickens with larvae of baylisascaris transfuga (nematoda: ascaridoidea).the larvae of baylisascaris transfuga (rudolphi, 1819) were able to penetrate the liver, lungs, carcass and brain of infected chickens, but a great number of larvae accumulated in the liver. no clinical signs were seen. birds may serve as paratenic hosts of the parasite, but b. transfuga seems not to be a possible agent of avian cerebrospinal nematodosis.19938244206
diffuse unilateral subacute neuroretinitis syndrome in a german most likely caused by the raccoon roundworm, baylisascaris procyonis. 19938428681
visceral larva migrans induced eosinophilic cardiac pseudotumor: a cause of sudden death in a child.a case of fatal cardiac larva migrans in a 10-year-old boy is described. the autopsy findings were quite dramatic, with a bosselated, sessile polypoid mass involving the left ventricular myocardium and protruding into the ventricular lumen. the precise morphologic characterization of the zoonotic ascarid larva was impaired by advanced resorption of the larva by an inflammatory infiltrate. nonetheless, morphometry of the larval remnants strongly suggested the raccoon ascarid, baylisascaris procyo ...19958522917
efficacy of six anthelmintics against luminal stages of baylisascaris procyonis in naturally infected raccoons (procyon lotor).the efficacy of six anthelmintics against natural infections of baylisascaris procyonis in raccoons (n = 7 per drug) was determined in a series of critical tests. the drugs were given via moist cat food as a single dose or once daily for three consecutive days. raccoons treated with pyrantel embonate (1 x 20 mg base kg-1 bodyweight (bwt.)), ivermectin (1 x 1 mg kg-1 bwt.), moxidectin (1 x 1 mg kg-1 bwt.), albendazole (3 x 50 mg kg-1 bwt.), fenbendazole (3 x 50 mg kg-1 bwt.) or flubendazole (3 x ...19958644451
ocular larva migrans and histopathological lesions in mice experimentally infected with baylisascaris transfuga embryonated eggs.the ability of baylisascaris transfuga larvae to cause ocular larva migrans (olm) in mice was examined. mice were given approximately 3500 infective eggs of b. transfuga per os. their eyes were removed and examined either microscopically or histologically at various intervals post-infection. larvae were recovered beginning 7 days after infection. histologically, free larvae were observed in the posterior chamber and within the ocular membranes. larval granulomas were present in the choroid with ...19968720568
effect of ivermectin on the migration of baylisascaris transfuga larvae into the brain of mice. 19968768462
baylisascaris larva migrans in a spider monkey (ateles sp.). 19968864984
baylisascaris procyonis larva migrans in a puppy: a case report and update for the veterinarian.baylisascaris larva migrans (lm) has been recognized as a cause of central nervous system (cns) disease in puppies. a presumptive antemortem diagnosis is based on a history of raccoon exposure, clinical signs, cerebrospinal fluid eosinophilic pleocytosis, and peripheral blood eosinophilia. early diagnosis is critical for treatment or prevention of disease in other dogs, animals, or humans exposed to the suspected contaminated area. in the present case, an antemortem diagnosis was not made, empha ...19968963740
baylisascaris sp. found in a wild northern bobwhite (colinus virginianus).during a telemetry study conducted between 1993 and 1995 in east-central kansas (usa) on northern bobwhite (colinus virginianus) populations, a wild adult male quail was found with signs of disorientation and torticollis in august 1994 in lyon county, kansas. based on histological and parasitological examination, it was determined that the bird was infected with larval nematodes of the genus baylisascaris spp. this is the first known recorded case of baylisascaris sp. in a wild game bird species ...19979027706
baylisascariasis in raccoons from southern coastal texas.two hundred and two baylisascaris procyonis were collected from 23 (70%) of 33 raccoons (procyon lotor) at three localities in southern coastal texas (usa). abundances of b. procyonis were similar among collection localities. the presence of b. procyonis in texas is confirmed, and this record considerably extends the potential range of baylisascariasis larval migrans in north america.19979249718
naturally occurring cerebral nematodiasis due to baylisascaris larval migration in two black-and-white ruffed lemurs (varecia variegata variegata) and suspected cases in three emus (dromaius novaehollandiae).during september and october 1992, two black-and-white ruffed lemurs (varecia variegata variegata) were housed in an outdoor wire enclosure at the tulsa zoological park. the following february and april, both lemurs developed head tilt and ataxia, and they were euthanized. necropsy revealed multifocal malacia of the white matter of the pons, cerebellum, internal capsule, and cerebral and cerebellar peduncles. nematode larvae consistent with baylisascaris spp. were observed in the brain of one le ...19979279412
susceptibility of peromyscus leucopus and mus musculus to infection with baylisascaris this study, we compared the susceptibility of peromyscus leucopus (white-footed mouse), a common natural intermediate host, and mus musculus, a commonly used experimental model, to infection with larvae of the raccoon ascarid, baylisascaris procyonis. three groups of 10 mice of each species were given 50, 250, or 500 infective b. procyonis eggs by gavage. the mice were observed daily for clinical signs of central nervous system (cns) disease and at necropsy the distribution of larvae in 10 bo ...19979406787
parenteral infection in mice with baylisascaris transfuga (nematoda: ascaridae) infective order to investigate the ability of infective larvae of the nematode baylisascaris transfuga (rudolphi, 1819) sprent, 1968 to hatch from the egg-shells and then to migrate in tissues, parenteral infections of mice with embryonated eggs were performed. two groups of outbred albino mice were infected with approximately 3500 b. transfuga infective eggs subcutaneously (s.c.) or intraperitoneally (i.p.). b. transfuga larvae in the i.p. group rapidly hatched and migrated to the intestine, liver, lu ...19959599430
single-strand conformation polymorphism (sscp)-based mutation scanning approaches to fingerprint sequence variation in ribosomal dna of ascaridoid this study, we assessed single-strand conformation polymorphism (sscp)-based approaches for their capacity to fingerprint sequence variation in ribosomal dna (rdna) of ascaridoid nematodes of veterinary and/or human health significance. the second internal transcribed spacer region (its-2) of rdna was utilised as the target region because it is known to provide species-specific markers for this group of parasites. its-2 was amplified by pcr from genomic dna derived from individual parasites a ...19989694283
[infections with baylisascaris procyonis in humans and raccoons].baylisascaris procyonis is an ascarid which parasitizes the small intestine of raccoons. the parasite is not very pathogenic in the raccoon because larvae do not migrate in this host. in other animals the larvae migrate through the body. they do not develop into adult worms in the intestine but rather become encysted in granulomas, showing a preference for the brain. in humans these larvae cause different larva migrans syndromes. patients with neural larva migrans syndrome show severe brain symp ...19989728387
cerebrospinal nematodiasis in a white-handed gibbon (hylobates lar) due to baylisascaris adult white-handed gibbon (hylobates lar) at a zoo in eastern kansas was euthanized after developing a head tremor, generalized motor incoordination, and partial paresis of the right arm that persisted over 2 yr. magnetic resonance imaging early in the course of the disease demonstrated a localized left frontal lobe cerebritis. larvae morphologically consistent with a baylisascaris species were seen in tissue sections of the cerebrum and cerebellum. epizootiologic investigation, which include ...19989732041
congenital baylisascaris sp. larval migrans in a newborn lamb.a 3-day-old domestic lamb, moribund since birth, was submitted as part of a diagnostic effort concerning weak newborn lambs due possibly to congenital bluetongue virus infection. gross lesions were consistent with such an event. histologic examination of cerebrum and cerebellum revealed multiple granulomas, the age of which required prenatal development. these contained larvae compatible with those of baylisascaris sp. this finding together with evidence that parents of children with neural larv ...199910207377
implications of raccoon latrines in the epizootiology of baylisascariasis.raccoons (procyon lotor) frequently establish defecation sites, termed latrines, on large logs, stumps, rocks, and other horizontally oriented structures/surfaces. these latrines are important foci of infective eggs of baylisascaris procyonis, a nematode parasite of raccoons which is pathogenic to numerous species of mammals and birds. to examine the role of raccoon latrines in this animal-parasite interaction, we documented animal visitations to raccoon latrines in two large forested tracts and ...199910479081
parasites in grizzly bears from the central canadian arctic.standardized flotation techniques were used to survey 56 grizzly bear (ursus arctos) fecal samples for parasites. the samples were collected during the spring and autumn of 1995 and 1996 in the central arctic of the northwest territories (canada). parasites of the genera nematodirus, gastrointestinal coccidia, and an unidentified first stage protostrongylid larva are reported for the first time from grizzly bear feces in north america. parasites of the genera diphyllobothrium and baylisascaris a ...199910479104
cerebral larva migrans in a raccoon (procyon lotor).during 1997, gross and histopathologic examinations were performed on an adult female raccoon (procyon lotor) that was live-trapped in corvallis, oregon. multifocal eosinophilic granulomas indicative of neural and visceral larva migrans were observed. however, within these granulomas, the presence of parasitic larva was seen only in the cerebrum. morphologic characteristics indicated that the nematode was an ascarid larva. however, it was smaller than the larva of baylisascaris sp. this appears ...199910568447
radiologic-pathologic findings in raccoon roundworm (baylisascaris procyonis) encephalitis.a 13-month-old boy developed eosinophilic meningoencephalitis, retinitis, and a protracted encephalopathy with severe residual deficits. the initial mr examination revealed diffuse periventricular white matter disease, and follow-up images showed atrophy. brain biopsy, serology, and epidemiologic studies lead to the diagnosis of baylisascaris procyonis infection, a parasitic disease contracted through exposure to soil contaminated by the eggs of a common raccoon intestinal roundworm. the patholo ...200010696033
intestinal parasites of raccoons (procyon lotor) from southwest british columbia.this is the first extensive survey of metazoan parasites (particularly of the roundworm baylisascaris procyonis) from the intestines of raccoons in british columbia. the sample collected in 1997-1998 consisted of 82 raccoons that had been sick or had been killed accidentally by automobiles. fifteen parasite taxa were found: 3 nematodes, 9 digenetic trematodes, 2 acanthocephalans and 1 cestode. ten of these parasites constitute new host records for raccoons, including 4 digenetic trematodes that ...200010805249
raccoon roundworm (baylisascaris procyonis) encephalitis: case report and field investigation.baylisascaris procyonis is a common and widespread parasite of raccoons in the united states and canada. with large raccoon populations occurring in many areas, the potential risk of human infection with b procyonis is high. we report a case of severe raccoon roundworm (b procyonis) encephalitis in a young child to illustrate the unique clinical, diagnostic, and treatment aspects, as well as public health concerns of b procyonis infection. acute and convalescent serum and cerebrospinal fluid sam ...200011015551
[carnivorous ascaridata in belarus and their medical significance].long-term (1980-1998) helminthological animal surveys in southern belarus (polesye) revealed 4 types of worms of the suborder ascaridata of medical significance: ascaris (= baylisascaris) devosi (sprent, 1952), toxascaris leonina (linstow, 1902), toxocara canis (werner, 1782) and t. cati (schrank, 1788). the host of the first worm are nartens (8 species) and the latter 3 ones are canine and feline families (4 and 2 species, respectively). emphasis is laid on the fact that in belarus there is a r ...200111680373
eosinophil-associated inflammation and elaboration of eosinophil-derived proteins in 2 children with raccoon roundworm (baylisascaris procyonis) encephalitis.eosinophil-associated proteins, especially eosinophil-derived neurotoxin, may be important contributors to the neurologic pathology and symptoms caused by baylisascaris procyonis infection.200111694677
first outbreak of baylisascaris procyonis larva migrans in rabbits in japan.a syndrome of progressive neurological signs was noticed in rabbits (oryctolagus cuniculus) kept in a small wildlife park in mid-july 2000. three out of 12 common raccoons (procyon lotor) kept in this park were infected with baylisascaris procyonis, and the larvae were found from affected rabbits. this outbreak is the first proven b. procyonis larva migrans in japan, and the potential risk of serious zoonosis by this ascarid species should be considered by pet owners, veterinarians, physicians a ...200211880233
baylisascaris procyonis: an emerging helminthic zoonosis.baylisascaris procyonis, a roundworm infection of raccoons, is emerging as an important helminthic zoonosis, principally affecting young children. raccoons have increasingly become peridomestic animals living in close proximity to human residences. when b. procyonis eggs are ingested by a host other than a raccoon, migration of larvae through tissue, termed larval migrans, ensues. this larval infection can invade the brain and eye, causing severe disease and death. the prevalence of b. procyonis ...200211971766
fatal cerebrospinal disease caused by baylisascaris procyonis in domestic rabbits.infection with baylisascaris procyonis, the common roundworm of raccoons, was found to be the cause of an epizootic of fatal cns disease in domestic rabbits (oryctolagus cuniculus). clinical signs included torticollis, ataxia, tremors, and falling. gross lesions were limited to white, raised nodules (1 to 1.5 mm) on the epicardium, endocardium, and liver serosa, and they were found to be larval granulomas. microscopic lesions included multifocal myocarditis, multifocal hemorrhagic tracks and ass ...198312002587
baylisascaris procyonis (nematoda: ascaridoidea) eggs in raccoon (procyon lotol) latrine scats in orange county, california.baylisascaris procyonis is the common intestinal nematode of the raccoon and is well-recognized as a cause of visceral, ocular, and neural larva migrans in many species of wild and domestic birds and mammals, including humans. to develop data on the prevalence of b. procyonis in orange county, california, 800 distinct raccoon latrine sites were sampled in 4 spatial zones from 15 january to 31 december 2000. counts of fecal eggs per gram (epg) were determined and evaluated with reference to spati ...200212053964
baylisascaris procyonis (nematoda: ascarididae) larva migrans in free-ranging wildlife in orange county, california.baylisascaris procyonis is well recognized as a cause of visceral (vlm), ocular, and neural (nlm) larva migrans in birds and mammals, including man. a study of the prevalence of larva migrans in free-ranging wildlife associated with raccoon latrines as well as a retrospective study of wildlife mortalities with neurological disease was conducted in 2000 in orange county, california. eighty-seven birds of 18 species and 64 mammals of 8 species were found to have nlm or vlm or both. nlm clinical si ...200212054001
neural larva migrans caused by the raccoon roundworm baylisascaris procyonis.baylisascaris procyonis, the common raccoon roundworm, is a rare cause of devastating or fatal neural larva migrans in infants and young children. we describe the clinical features of two children from suburban chicago who developed severe, nonfatal b. procyonis neural larva migrans. despite treatment with albendazole and high dose corticosteroids, both patients are neurologically devastated. in many regions of north america, large populations of raccoons with high rates of endemic b. procyonis ...200212394823
cerebral arteriosclerosis in an aged captive polar bear (ursus maritimus).cerebral arteriosclerosis was observed upon necropsy of a 36-yr-old female captive polar bear (ursus maritimus) that developed a sudden onset of seizure-like activity and died. the medium and large cerebral arteries of the meninges had moderate to severe diffuse discoloration and mineralization of the matrix of the tunica media, with little or no associated cellular reaction. scanning electron microscopy of the affected arteries showed discrete crystalline calcified deposits in the media and scl ...200212564538
baylisascaris procyonis (nematoda: ascaridae) in raccoons (procyon lotor) in orange county, california.baylisascaris procyonis is one of the common nematodes of the raccoon (procyon lotor), being well recognized as a cause of visceral, ocular, and neural larval migrans in many species of wild and domestic birds and mammals, including humana. between january 15 and december 31, 2000 in orange county, ca, 640 raccoons (p. lotor) were live-trapped in four spatial distributions zones, and b. procyonis egg shedding prevalence and fecal egg per gram (epg) counts were determined in relation to spatial d ...200112653152
diffuse retinochoroiditis due to baylisascaris procyonis in monglian gerbils.baylisascaris procyonis, raccoon roundworm, causes a severe retinal lesion in humans. the lesion is termed as diffuse unilateral subacute neuroretinitis (dusn). to understand the pathogenesis of b. procyonis in gerbils, we inoculated 17 embryonated eggs/g body weight of b. procyonis into 15 male mongolian gerbils, merionis ungiculatus, and monitored their fundi with an ophthalmoscope. six of 15 gerbils (40%) showed severe retinitis with a sinuous track due to larval movement. the lesions extende ...200312659323
epidemiological aspects of the first outbreak of baylisascaris procyonis larva migrans in rabbits in japan.larva migrans caused by the common raccoon ascarid, baylisascaris procyonis, is a zoonotic disease of critical importance in north america. recently we encountered the first proven outbreak of this disease in japan in domestic rabbits (oryctolagus cuniculus) in a small wildlife park. in this park, raccoons (procyon lotor) had been kept for 9 years, and one raccoon was donated to the park by a pet owner 8 weeks prior to the occurrence of an outbreak in rabbits. of 12 total raccoons, three raccoon ...200312736426
eye findings of diffuse unilateral subacute neuroretinitis and multiple choroidal infiltrates associated with neural larva migrans due to bbaylisascaris report childhood infection with baylisascaris procyonis (raccoon round worm) manifesting as diffuse unilateral subacute neuroretinitis (dusn) and choroidal infiltrates in association with neurologic disease (neural larva migrans).200312788132
neuropathological observation of rabbits (oryctolagus cuniculus) affected with raccoon roundworm (baylisascaris procyonis) larva migrans in japan.larvae of the raccoon roundworm, baylisascaris procyonis (b. procyonis) are a known cause of cerebrospinal larva migrans in animals and humans. the present paper described details of the central nervous lesion in the rabbits (oryctolagus cuniculus) affected with b. procyonis larva migrans in japan. clinically affected animals showed neurological signs including circling, torticollis, tremor of head, or ataxic gait. the most characteristic pathological alterations were large malacic lesions assoc ...200312867729
raccoon roundworm (baylisascaris procyonis). 200312867843
raccoon roundworm eggs near homes and risk for larva migrans disease, california communities.the raccoon roundworm, baylisascaris procyonis, is increasingly recognized as a cause of serious or fatal larva migrans disease in humans and animals. we assessed the potential for infection in three northern california communities by determining the density and distribution of raccoon latrines, where transmission primarily occurs, and the prevalence of eggs at private residences. we collected fecal samples from 215 latrines and found that 44%-53% of the latrines contained b. procyonis eggs and ...200314720389
baylisascaris procyonis in the metropolitan atlanta area.baylisascaris procyonis, the raccoon roundworm responsible for fatal larva migrans in humans, has long been thought to be absent from many regions in the southeastern united states. during spring 2002, 11 (22%) of 50 raccoons trapped in dekalb county, georgia, had b. procyonis infection. the increasing number of cases highlight this emerging zoonotic infection.200314720412
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