Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| experimental toxoplasmosis in pregnant cats. | cysts of the k strain of toxoplasma gondii were administered orally to nine pregnant cats having no antibody to the organism at each of the three stages of gestation, namely early (14 days), middle (30 days), and late (40 and 51 days). premature and weak or deformed fetuses were observed in the offsprings delivered by mother cats infected with toxoplasma in the early or middle stage of gestation, while the cats infected at the late stage were delivered of apparently healthy fetuses. mother cats ... | 1993 | 8117796 |
| [cerebral abscess caused by toxoplasma gondii and aids. report of a case with anatomo-pathological study]. | we report a 47 year old woman that presented to the hospital with an intracranial hypertension syndrome, a right hemiparesis and a several months history of progressive malaise and behavioral disturbances. during the hospital stay, positive hiv antibodies were detected and cat scan showed a profound left parietal rounded hypodense lesion. the patient died 21 days after admission and the postmortem pathological study showed a deep abscess in the left basal ganglia, with recognizable toxoplasma go ... | 1993 | 8191154 |
| [toxoplasmosis epizootic in a fattening swine herd]. | in a fattening pig herd comprising 80 animals 13 were affected with clinical manifest toxoplasmosis presumably due to cat feces in the food. seven pigs died, one was killed in extremis. the clinical signs were anorexia, apathy, fever, cyanosis, dyspnoea and partly hind limb weakness. one pig that died 3 days after onset of clinical signs had widespread necroses in liver and lymphatic organs. single tachyzoites were detected by immunoperoxidase technique. one pig dying on day 11 and another eutha ... | 1993 | 8223241 |
| gene replacement in toxoplasma gondii with chloramphenicol acetyltransferase as selectable marker. | a system for stable transformation of toxoplasma gondii tachyzoites was developed that exploited the susceptibility of toxoplasma to chloramphenicol. introduction of the chloramphenicol acetyltransferase (cat) gene fused to toxoplasma flanking sequences followed by chloramphenicol selection resulted in parasites stably expressing cat. a construct incorporating the tandemly repeated gene, b1, targeted efficiently to its homologous chromosomal locus. knockout of the single-copy gene, rop1, was als ... | 1993 | 8235614 |
| feline immunodeficiency virus predisposes cats to acute generalized toxoplasmosis. | this study was designed to examine the effects of a pre-existing, clinically asymptomatic feline immunodeficiency virus (fiv) infection on a primary challenge with toxoplasma gondii. parenteral challenge of fiv-infected cats with tachyzoites of the me49 strain of t. gondii caused a precipitous drop in all lymphocytes (cd4+, cd8+, and b cells) and generalized severe toxoplasmosis. the predominant postmortem lesions included acute and often fatal interstitial pneumonia, dominated histologically by ... | 1993 | 8238262 |
| seroprevalence of antibodies against toxoplasma gondii among two rural populations in northern israel. | the prevalence of antibodies against toxoplasma gondii was measured in two rural populations in northern israel--jewish kibbutz members and arab villagers. the respective prevalences in these two populations were 22.2% and 55.8% (p < 0.001). no correlation was found between the presence of antibodies and sex, occupation, contact with cats, a history of fever and/or lymphadenopathy, eye disease, abortions or delivery of children with congenital malformations. in contrast to jewish children who we ... | 1993 | 8244662 |
| a feline model of ocular toxoplasmosis. | purpose. this study was performed to characterize the clinical, serologic, histopathologic, and immunohistochemical features of an experimental model of ocular toxoplasmosis in cats. | 1993 | 8258525 |
| [parasitological fecal studies of equids, dogs, cats and hedgehogs during the years 1984-1991]. | the results of the coproscopical examinations in horses, dogs, cats and hedgehogs between 1984 and 1991 are presented. in 9192 samples from horses 55.5% stages of strongylids, 4.0% of parascaris equorum, 2.2% of anoplocephalids, 1.6% strongyloides westeri, 0.7% of oxyuris equi, 0.6% of eimeria leuckarti, 0.2% of fasciola hepatica and 0.04% of dictyocaulus arnfieldi were found. in 48.0% of the 46 samples from donkeys eggs from strongylids were detected, in 17.4% larvae from dictyocaulus arnfieldi ... | 1993 | 8261912 |
| neonatal toxoplasmosis in littermate cats. | toxoplasmosis was diagnosed histologically in 9 kittens and 1 queen from 5 liters. in litter 1, four 3-month-old siamese kittens and the queen were affected. the queen died of generalized toxoplasmosis, and her kittens died or were euthanatized 20, 22, or 28 days later. in litter 2, two of 3 abyssinian 4- and 4.5-month-old kittens died of toxoplasmosis. in litter 3, an abyssinian, delivered by cesarean section, became ill 17 days after delivery, and died 2 days later because of toxoplasmic hepat ... | 1993 | 8288476 |
| histologically confirmed clinical toxoplasmosis in cats: 100 cases (1952-1990). | tissue sections from 119 cats that died or were euthanatized (1952-1990) because of toxoplasmosis-like illness were reexamined for toxoplasma gondii by direct microscopy and immunohistochemical staining with anti-t gondii serum. clinical and pathologic data from 100 of these cats with histologically verified toxoplasmosis were then analyzed. of these 100 cats, 36 were considered to have generalized toxoplasmosis, 26 predominantly pulmonary lesions, 16 abdominal, 2 hepatic, 1 pancreatic, 1 cardia ... | 1993 | 8288479 |
| serological study of human toxoplasmosis in calcutta. | a total of 248 randomly selected subjects from urban, semiurban and rural areas of calcutta was studied serologically for the prevalence of antibody to toxoplasma gondii using latex agglutination technique. fifty-nine (23.79%) out of these 248 subjects were found to possess anti-toxoplasma antibody. seropositivity was found to be higher in females (25%) as compared to males (22.32%). agewise highest positivity (30.5%) for toxoplasma antibody was observed in the third decade and lowest in the fir ... | 1993 | 8308306 |
| feline serum antibody responses to toxoplasma gondii and characterization of target antigens. | the toxoplasma gondii-specific target antigens for feline immunoglobulin m (igm) and immunoglobulin g (igg) immune responses were studied longitudinally using western blot immunoassay in 8 cats experimentally inoculated with t. gondii strain me49. multiple antigens were recognized by igm and igg during the course of infection. dense bands were associated with 12 antigens in the igm western blot immunoassay and 30 antigens in the igg western blot immunoassay. immunoglobulin m responses were maxim ... | 1994 | 8308661 |
| ribosomal rna sequences for the specific detection of toxoplasma gondii by hybridization assay. | we describe the development of five oligonucleotide probes which target the small sub-unit rrna of toxoplasma gondii. these probes bind to different regions within the rrna and all were effective in producing a detectable signal with as little as 10 ng of total cellular rna. one probe in particular, tgb, was able to detect as little as 1 ng of rna and was the most specific. a sixth probe, previously developed for hybridization with sarcocystis spp., was evaluated for its specificity and was show ... | 1993 | 8321257 |
| effect of feline immunodeficiency virus infection on toxoplasma gondii-specific humoral and cell-mediated immune responses of cats with serologic evidence of toxoplasmosis. | serum samples from 89 cats with serologic evidence of toxoplasmosis were identified by using an enzyme-linked immunosorbent assay (elisa) that detected toxoplasma gondii-specific immunoglobulin m (igm) or t. gondii-specific immunoglobulin g (igg). concurrent feline immunodeficiency virus (fiv) infection was detected in 36 cats using an elisa for detection of fiv-specific igg. the majority of the cats in both the fiv-seropositive and fiv-seronegative groups were male and > 5 years of age. fiv-ser ... | 1993 | 8388954 |
| immunization of cats with tissue cysts, bradyzoites, and tachyzoites of the t-263 strain of toxoplasma gondii. | previous studies have demonstrated that oral administration to cats of tissue cysts of the oocyst-negative mutant strain of toxoplasma gondii, t-263, induces immunity to oocyst shedding following challenge. experiments were designed to compare the levels of protection induced by t. gondii t-263 when tissue cysts, bradyzoites released from tissue cysts, and tachyzoites were administered to cats. in 1 experiment, groups of cats received 2 oral doses of intact tissue cysts or released bradyzoites o ... | 1993 | 8410543 |
| cats and toxoplasmosis risk in hiv-infected adults. | to establish the prevalence and incidence of toxoplasmosis in an adult human immunodeficiency virus (hiv) population, and to determine if cat ownership contributes to the risk of toxoplasmosis. | 1993 | 8416410 |
| feline zoonotic diseases. | many of the feline zoonoses occur more frequently in veterinary personnel owing to their direct contact with cats and the potential for exposure to infected body tissue or fluids. infection of humans with afipia felis, yersinia pestis, francisella tularensis, and other aerobic/anaerobic bacteria may cause great discomfort and in some situations terminal illness. although many systemic fungal agents infect humans and cats, only sporothrix schenckii has been shown to infect humans following direct ... | 1993 | 8421889 |
| persistence of tissue cysts in edible tissues of cattle fed toxoplasma gondii oocysts. | four 1-year-old steers were each inoculated orally with 10,000 toxoplasma gondii oocysts of the gt-1 strain and euthanatized on postinoculation days (pid) 350, 539, 1191, and 1201. samples (500 g) of tongue, heart, semimembranosus and semitendinosus muscles (roast), intercostal muscles (ribs), longismus muscles (tenderloin), brain, kidneys, liver, and small intestine were bioassayed for t gondii by feeding to cats and examination of cat feces for shedding of oocysts. toxoplasma gondii was recove ... | 1993 | 8430937 |
| sensitive and specific polymerase chain reaction detection of toxoplasma gondii for veterinary and medical diagnosis. | a polymerase chain reaction (pcr) method was developed for the detection of toxoplasma gondii. a universal- and a t. gondii-specific primer was used to amplify a region of the small subunit ribosomal rna gene. this approach allows for a theoretical detection limit of 0.01 zoite of t. gondii per sample assayed. experiments showed that this pcr method could detect 0.1 pg of t. gondii dna, which represents about one organism. polymerase chain reaction tests using dnas of cat, dog, swine, cattle, hu ... | 1993 | 8431804 |
| unidentified toxoplasma-like tissue cysts in the brains of three cats. | tissue cysts of an unidentified toxoplasma-like parasite were found in three of 103 cats that were diagnosed histologically with toxoplasmosis-like illness at the angell memorial animal hospital, boston, ma, between 1952 and 1991. tissue cysts in these three cats were confined to the brain and two cats had concurrent lymphoid disorders. the tissue cysts of the unidentified parasite were about twice the size of toxoplasma gondii tissue cysts. | 1993 | 8447073 |
| the prevalence of giardia and other intestinal parasites in children, dogs and cats from aboriginal communities in the kimberley. | to determine the prevalence of giardia duodenalis and other intestinal parasites in children, dogs and cats from aboriginal communities in the west kimberley region of western australia. | 1993 | 8450779 |
| neurosurgical management of the acquired immunodeficiency syndrome. an update. | a retrospective review of a 24-month experience on the neurosurgical service at a large metropolitan hospital identified 33 patients with the acquired immunodeficiency syndrome (aids) who underwent diagnostic or therapeutic procedures. intracranial mass lesions unresponsive to empiric medical therapy for presumed toxoplasma gondii encephalitis underwent diagnostic biopsy in 22 patients: primary lymphoma was identified in 10 (45%) of these patients, and biopsy led to a treatable diagnosis in 16 o ... | 1993 | 8460506 |
| the effect of cobalt-60 irradiation on the infectivity of toxoplasma gondii. | toxoplasma gondii cysts in the tissues of experimentally infected mice and pigs were irradiated with cobalt-60 at various doses and used to infect mice and kittens. loss of parasite infectivity was confirmed following irradiation whereas control animals inoculated with non-irradiated infected tissues became infected. experiments were repeated to calculate the minimal effective dose (med) of irradiation to eradicate parasite infectivity. the med for the chinese nt strain and the american me-49 an ... | 1993 | 8468140 |
| biology of toxoplasma gondii. | in conclusion, a large body of new information on the biology and immunology of t. gondii has accumulated in the past several years. much of this is due to the advent of aids and the increased funding made available to researchers interested in opportunistic infections in this patient population. these scientific advances have led to a better understanding of the process by which toxoplasma infects mammalian host cells, molecular biology and biochemistry of the parasite, antigenic structure and ... | 1993 | 8471191 |
| toxoplasmosis and pregnancy. | toxoplasmosis is an infection caused by the protozoa toxoplasma gondii that is prevalent worldwide. the protozoa was given its name when it was first isolated in 1909 in africa in a rodent, ctenodactylus gondii. it can be contracted by eating infected meat or eggs that are raw or undercooked, or through contact with the feces of an infected cat. more dangerously, it can be congenitally acquired by transfer through the placenta if the mother contracts the disease during pregnancy. although the fl ... | 1993 | 8472240 |
| detection of toxoplasma gondii antigen-containing immune complexes in the serum of cats. | enzyme-linked immunosorbent assays for the detection of toxoplasma gondii antigen-containing igm immune complexes (t gondii-specific igm-ic) and igg immune complexes (t gondii-specific igg-ic) in the serum of cats were developed. serum from clinically ill, naturally infected cats; healthy, naturally infected cats; and healthy cats experimentally inoculated with t gondii was assayed. all combinations of t gondii-specific igm, igg, antigens, igm-ic, and igg-ic were detected in naturally infected a ... | 1993 | 8498745 |
| isolation of tissue cysts of toxoplasma, isospora, hammondia and sarcocystis from camel (camelus dromedarius) meat in saudi arabia. | meat samples were collected from the oesophagus and tongue of 38 camels slaughtered at the main abattoir of al-ahsa city, saudi arabia. five cats and three dogs, conventionally reared and coccidia-free, were caged individually in steel cages. camel meat was pooled, minced and fed to four cats and two dogs. one cat and one dog were not fed meat and were kept as noninfected controls. faecal samples from infected and control animals were examined daily for a period of 2 months after feeding the mea ... | 1995 | 8533274 |
| sensitivity and specificity of various serologic tests for detection of toxoplasma gondii infection in naturally infected sows. | the sensitivity and specificity of various serologic tests for antibodies to toxoplasma gondii were compared in 1,000 naturally exposed sows, using isolation of viable t gondii as the definitive test. serum samples obtained from heart blood of 1,000 sows from iowa were examined for t gondii antibodies by use of the modified agglutination test (mat), latex agglutination test (lat), indirect hemagglutination test (ihat), and elisa. toxoplasma gondii was isolated from 170 hearts of 1,000 sows by bi ... | 1995 | 8533974 |
| concurrent toxoplasmosis and feline infectious peritonitis in a cat. | a 13-year-old, 4-kg, neutered male maine coon presented with ascites. toxoplasma gondii tachyzoites were seen within neutrophils and macrophages, and free within the abdominal fluid. at necropsy, many abdominal organs were positive for feline infectious peritonitis (fip) antigens using immunohistochemical staining. this apparently is the first report of concurrent toxoplasmosis and fip in a domestic cat. | 1995 | 8542361 |
| mediation of immunity to toxoplasma gondii oocyst shedding in cats. | immunity to toxoplasma gondii, as measured by oocyst shedding, was studied in cats. in 3 trials, 12 3-mo-old t. gondii-free cats were fed tissue cysts of the me-49 strain of t. gondii. all cats shed t. gondii oocysts for approximately 1 wk starting 3-5 days after ingesting tissue cysts. one cat became ill because of toxoplasmic pneumonia and was killed 17 days after inoculation. the remaining cats remained clinically normal. approximately 3 mo after primary infection, these 11 cats (immune) and ... | 1995 | 8544058 |
| long-term antibody responses of cats fed toxoplasma gondii tissue cysts. | as part of a long-term study on immunity to oocyst shedding, 12 4-6-mo-old cats were inoculated orally with tissue cysts of the me-49 strain (6 cats) or the ts-2 strain (6 cats) of toxoplasma gondii. two cats fed the me-49 strain died or were killed because of acute toxoplasmosis 12 and 13 days after inoculation (dai), respectively. on day 39 after primary infection, 5 cats (2 infected with the me-49 strain and 3 infected with the ts-2 strain) were challenged orally with tissue cysts of the me-4 ... | 1995 | 8544059 |
| identification of opossums (didelphis virginiana) as the putative definitive host of sarcocystis neurona. | sarcocystis neurona is an apicomplexan that causes equine protozoal myeloencephalitis (epm) in north and south america. horses appear to be an aberrant host, because the merozoites continually divide in the central nervous system, without encysting. the natural host species has not previously been identified. the small subunit ribosomal rna (ssurna) gene of s. neurona was compared to those of sarcocystis muris, sarcocystis cruzi, toxoplasma gondii, and cryptosporidium parvum to identify a unique ... | 1995 | 8544064 |
| preventing toxoplasmic encephalitis in persons infected with human immunodeficiency virus. | toxoplasmic encephalitis (te) is the second most common aids-related opportunistic infection of the cns. it occurs in 10%-50% of patients with aids who are seropositive for antibodies to toxoplasma gondii and have cd4+ t lymphocyte counts of < 100/mm3. primary toxoplasmic infection usually is acquired by ingestion of t. gondii oocysts from soil contaminated by cat feces or by ingestion of tissue cysts present in undercooked red meats. in patients with aids, te probably results from the reactivat ... | 1995 | 8547512 |
| parasite prevalence in free-ranging farm cats, felis silvestris catus. | no animals tested were positive for feline leukemia virus antigen and chlamydia psittaci antibodies, but all were positive for antibodies to feline calicivirus (fcv), feline herpesvirus 1 (fhv1) and rotavirus. they had antibodies to feline parvovirus (96%), feline coronavirus (84% and cowpox virus (2%). antibody to feline immunodeficiency virus (fiv) was found in 53% of animals, which were less likely to be infected with haemobartonella felis, and had higher fhv antibody titres than cats without ... | 1996 | 8620914 |
| molecularly cloned feline immunodeficiency virus ncsu1 jsy3 induces immunodeficiency in specific-pathogen-free cats. | a full-length feline immunodeficiency virus ncsu1 (fiv-ncsu1) genome (jsy3) was cloned directly from fiv-ncsu1-infected feline cd4+ lymphocyte (fcd4e) genomic dna and identified by pcr amplification with 5' long terminal repeat, gag, env, and 3' long terminal repeat primer sets. supernatant from fcd4e cells cocultured with jsy3-transfected crandell feline kidney (crfk) cells was used as an inoculum. cell-free jsy3 virus was cytopathogenic for fcd4e lymphocytes but did not infect crfk cells in vi ... | 1996 | 8627777 |
| infectivity of low numbers of toxoplasma gondii oocysts to pigs. | to define the infectiousness of the veg strain of toxoplasma gondii, 42 pigs were fed doses estimated at 10, 1, or < 1 mouse infective oocysts. they were killed 38-99 days after inoculation and 50 g of tissues from their tongue, heart, and brain were individually homogenized in acidic pepsin solution and bioassayed in mice. pools of brain, heart, tongue, and skeletal muscle (total 500 g) were bioassayed in cats. toxoplasma gondii was isolated by bioassays in mice and in cats from 13 of 14 pigs f ... | 1996 | 8636849 |
| determination of toxoplasma gondii in organs of naturally infected cattle in costa rica--comment. | 1995 | 8644455 | |
| incidence of anti-toxoplasma antibodies in women with high-risk pregnancy and habitual abortions. | toxoplasmosis is a zoonosis caused by toxoplasma gondii, an obligate intracellular parasite. in pregnant women on the worldwide scale, there are seroprevalences from 7% to 51.3% and in women with abnormal pregnancies and abortions the seroprevalences vary from 17.5% to 52.3%. in mexico, seropositivity has been found to vary from 18.2% to 44.8% in women with abnormal deliveries or abortions. this study's aim was to determine the incidence of igg and igm anti-toxoplasma antibodies in women at the ... | 1995 | 8668832 |
| [cellular interactions in the intracellular parasitism of cryptosporidia. i. the effect of cryptosporidium parvum on the phosphatase activity in the small intestine enterocytes of experimentally infected newborn rat pups]. | cytochemical methods for detection of non-specific phosphatases were employed at the light microscope level for identification of enzymatic activity in the small intestine of new-born rats (6--11 days old), both infected and non-infected with the intestinal coccidium cryptosporidium parvum. in the new-born rats, the level of alkaline and especially acid phosphatase is originally very low, suggesting their insignificant involvement in digestion processes in suckling animals compared to rats of ol ... | 1995 | 8669134 |
| detection of toxoplasma gondii in feline and canine biological samples by use of the polymerase chain reaction. | to develop a polymerase chain reaction (pcr) technique to identify toxoplasma gondii dna in biological samples from cats and dogs. | 1996 | 8669752 |
| serologic responses of cattle and other animals infected with neospora caninum. | to examine cross-reactivity among neospora caninum and closely-related apicomplexans. | 1996 | 8669764 |
| cryopreservation of an attenuated vaccine strain of the protozoan parasite toxoplasma gondii. | toxoplasma gondii is a protozoan parasite that infects birds and mammals, including humans. t. gondii t-263 is an attenuated mutant strain that is being developed as a live vaccine to protect cats from shedding oocysts. a cryopreservation procedure for t. gondii t-263 bradyzoites has been developed to meet the requirement for product stability. a me2so-based procedure for the cryopreservation of tachyzoites was used as a basis for process optimization. a modified cell culture plaque assay was us ... | 1996 | 8689890 |
| prevalence of agglutinating antibodies to toxoplasma gondii in small ruminants of the madrid region, spain, and identification of factors influencing seropositivity by multivariate analysis. | a seroepidemiological survey of toxoplasma gondii infection in sheep and goats was conducted in the madrid region of spain. sera were collected from 60 herds, for which farming management information and other relevant data for their characterization were also obtained through a questionnaire. the seroprevalence was 11.8% (64 out of 541), using the modified (2-mercaptoethanol) direct agglutination technique with a 1:64 cut-off titre. the relationship between seropositivity and the variables in t ... | 1996 | 8711895 |
| risk factors for toxoplasma gondii infection in pregnancy. results of a prospective case-control study in norway. | from 1992 to 1994, a prospective case-control study designed to identify preventable risk factors for toxoplasma gondii infection in pregnancy was conducted in norway. case-patients were identified through a serologic screening program encompassing 37,000 pregnant women and through sporadic antenatal testing for toxoplasma infection. a total of 63 pregnant women with serologic evidence of recent primary t. gondii infection and 128 seronegative control women matched by age, stage of pregnancy, ex ... | 1996 | 8712198 |
| complementation of a toxoplasma gondii rop1 knock-out mutant using phleomycin selection. | the rop1 gene of toxoplasma gondii encodes a rhoptry protein that has been implicated in host cell invasion by this obligate intracellular protozoan. to further explore the function of this protein, we created a rop1 deletion mutant by transfection with a plasmid encoding the bacterial chloramphenicol acetyltransferase (cat) gene flanked by rop1 genomic sequences. selection for chloramphenicol resistance yielded the desired rop1-deleted or 'knock-out' mutant. analysis of this mutant both in vitr ... | 1995 | 8719248 |
| paradoxical effect of clindamycin in experimental, acute toxoplasmosis in cats. | cats were experimentally inoculated parenterally with the me49 strain of toxoplasma gondii to characterize the efficacies of two different dosages of orally administered clindamycin hydrochloride in the treatment of ocular toxoplasmosis. concentrations of clindamycin hydrochloride at levels previously suggested to be inhibitory to t. gondii replication in vitro were achieved in the serum and aqueous humor but not in the cerebrospinal fluid. antibiotic therapy, initiated 7 days after inoculation, ... | 1996 | 8726000 |
| lesions of neonatally induced toxoplasmosis in cats. | five pregnant queens were inoculated orally with toxoplasma gondii tissue cysts. twenty-two live and three dead kittens were born 16 to 31 days after inoculation. four kittens were eaten by queens and, thus, were not available for histologic examination. twenty-one kittens that died or were euthanatized on day 2 (two kittens), 4 (one kitten), 5 (five kittens), 6 (five kittens), 7 (one kitten), 8 (four kittens), 16 (two kittens), and 29 (one kitten) after birth were studied histologically. t gond ... | 1996 | 8740702 |
| an apparent role of dogs in the transmission of toxoplasma gondii. the probable importance of xenosmophilia. | 1996 | 8784520 | |
| co-infection of toxoplasma gondii with other pathogens: pathogenicity and chemotherapy in animal models. | 1996 | 8791703 | |
| chemotherapy of human and animal coccidioses: state and perspectives. | the state and perspectives for chemotherapy of cyst-forming and non-cyst-forming coccidia in humans and animals are summarized. in toxoplasmosis the therapeutic care of transplacental infections, which have gone out of control because of immunodeficiency, is in the forefront of attempts at improvement. predominant drugs in use are pyrimethamine combined with a sulfonamide or with clindamycin, or trimethoprim plus sulfamethoxazole. for reasons of tolerability in human immunodeficiency virus (hiv) ... | 1996 | 8801548 |
| irradiation killing of toxoplasma gondii oocysts. | 1996 | 8822904 | |
| epidemiology of toxoplasma gondii in farm ecosystems. | 1996 | 8822905 | |
| common cis-acting elements critical for the expression of several genes of toxoplasma gondii. | transient transformation of toxoplasma using the cat (chloramphenicol acetyl transferase) reporter gene has been used to map promoter elements of four genes encoding dense granule proteins (gra1, gra2, gra5 and gra6). intense cat activities (gra1 > gra5 > gra2 > gra6) are detected for constructs containing 379bp, 276bp, 209bp and 265bp upstream of the transcription start site of the gra1, gra2, gra5 and gra6 genes, respectively. deletion analysis shows that optimal promoter activity of each gene ... | 1996 | 8858595 |
| toxoplasma gondii antigen recognition by serum immunoglobulins m, g, and a of queens and their neonatally infected kittens. | to evaluate antigen recognition patterns of serum igm, igg, and iga from queens and their kittens as a method of diagnosing neonatal toxoplasmosis. | 1996 | 8874728 |
| the stage-conversion time of toxoplasma gondii: interpretation of chemical-biologic data out of parasitologic or host context. | several published biologic times for the stage conversion of toxoplasma gondii from tachyzoite to bradyzoite in mice are critically examined. there are several reports of 3 days and many of longer times. possible errors, related to delay from dissemination of the infection, are pointed out. the time to the appearance of the 36-kda surface antigen, sometimes used for the diagnosis of bradyzoites, should be compared with the biologic attribute of bradyzoites, inducing the short prepatent period in ... | 1996 | 8875575 |
| seroprevalences of brucellosis, q-fever and toxoplasmosis in slaughter livestock in trinidad. | serum samples obtained from livestock (cattle, chickens, pigs, sheep, goats and water buffaloes) slaughtered at various slaughter houses in trinidad were screened for agglutinins to three zoonosis causing pathogens. of a total of 751 sera tested, 2 (0.3%) originating from chickens were positive for brucella abortus agglutinins using the rose bengal test (rbt), but both were negative by the tube serum agglutination test (sat). thirty-six (4.8%) of 749 sera were positive for coxiella burnetii aggl ... | 1996 | 8881416 |
| killing of toxoplasma gondii oocysts by irradiation and protective immunity induced by vaccination with irradiated oocysts. | toxoplasma gondii oocysts are highly resistant to environmental influences. to study the effect of alpha-irradiation on the viability of t. gondii oocysts, 1 million sporulated oocysts of the veg strain were irradiated to absorbed doses of 0.10, 0.15, 0.20, 0.25, 0.30, 0.40, or 0.50 kgy at 5 c with a 137cs gamma-irradiation source. treated oocysts were bioassayed for viable t. gondii in mice. viable t. gondii was not found in brains of mice 2 mo after oral inoculation with oocysts irradiated at ... | 1996 | 8885879 |
| primary and secondary toxoplasma gondii infection in normal and feline immunodeficiency virus-infected cats. | normal and asymptomatic feline immunodeficiency virus (fiv)-infected adult cats were inoculated orally with toxoplasma gondii tissue cysts to assess differences in clinical disease, t. gondii serologic test results, hematologic results, and oocyst shedding. there was no difference between fiv-naive and fiv-infected cats in terms of clinical illness and duration of oocyst shedding following primary exposure. both groups of cats developed significant decreases in neutrophil counts following primar ... | 1996 | 8885881 |
| strategies to reduce transmission of toxoplasma gondii to animals and humans. | toxoplasma gondii is found in the tissues of food animals and is an important cause of abortion and mortality in sheep and goats throughout the world. it causes mental retardation and loss of vision in congenitally infected children and death in immunosuppressed patients. a live vaccine, using a nonpersistent strain of t. gondii, is available in new zealand, the uk and europe which prevents t. gondii abortion in sheep. a live vaccine using a mutant strain of t. gondii (t-263) is being developed ... | 1996 | 8893464 |
| polymerase chain reaction for the detection of toxoplasma gondii in aqueous humor of cats. | to develop toxoplasma gondii b1 gene polymerase chain reaction (pcr) for use with aqueous humor of cats, and to report pcr and antibody detection results in naturally exposed cats with and without uveitis. | 1996 | 8915435 |
| antibody responses measured by various serologic tests in pigs orally inoculated with low numbers of toxoplasma gondii oocysts. | to follow antibody responses measured by various serologic tests in pigs orally inoculated with low (< or = 10 oocysts) numbers of toxoplasma gondii oocysts. | 1996 | 8950427 |
| infectivity and pathogenicity of toxoplasma gondii oocysts for cats. | toxoplasma gondii oocysts are highly infective to intermediate hosts including humans, pigs, and mice, but are considered less infective for cats, the definitive host. to determine infectivity of t. gondii oocysts for cats, 20 2- to 3-mo-old t. gondii-free cats in groups of 4 were fed graded doses of oocysts estimated to have 1, 10, 100, 1,000, or 10,000 mouse infective oocysts of the veg strain of t. gondii. feces of cats were examined for at least 35 days after feeding oocysts. all cats were k ... | 1996 | 8973406 |
| diagnostic evaluation of cats with seizure disorders: 30 cases (1991-1993). | to investigate causes of seizure disorders in cats. | 1997 | 8977651 |
| toxoplasma gondii: experimental infection in cats vaccinated with 60co-irradiated tachyzoites. | the effects of 60co-irradiation on the viability and immunogenicity of rh and beverley strains of toxoplasma gondii was examined. while 60co-irradiated tachyzoites retained invasive activity in mouse embryonal cells and sustained antigenicity in mouse peritoneal macrophages, the parasites did not develop in host cells. vaccination of mice with 60co-irradiated tachyzoites of either rh or beverley strains induced resistance to challenge with a highly virulent strain (rh strain). vaccination of kit ... | 1996 | 8983144 |
| feline ocular and cerebrospinal fluid toxoplasma gondii-specific humoral immune responses following specific and nonspecific immune stimulation. | toxoplasma gondii-naive cats and cats previously infected orally with t. gondii tissue cysts were inoculated with soluble tachyzoite antigens plus adjuvant or adjuvant alone. toxoplasma gondii-specific igm and igg were measured in serum, aqueous humor, and cerebrospinal fluid (csf). the goldman-witmer coefficient (c value) for ocular or central nervous system (cns) antibody production was calculated for aqueous humor or csf samples positive for t. gondii-specific antibodies. following inoculatio ... | 1996 | 9014303 |
| toxoplasma gondii expresses two distinct lactate dehydrogenase homologous genes during its life cycle in intermediate hosts. | two toxoplasma gondii genes were characterized that are differentially expressed during the parasite's life cycle. the genes named ldh1 and ldh2, respectively, encode polypeptides similar to the enzyme lactate dehydrogenase (ldh; l-lactate:nad+ oxidoreductase, ec 1.1.1.27) from a variety of organisms. they show 64.0% nucleotide identity in the coding region and both have an intron at the same relative position. the deduced amino acid sequences of ldh1 and ldh2 share 71.1% identity. ldh1 and ldh2 ... | 1997 | 9016946 |
| neospora caninum: role for immune cytokines in host immunity. | neospora caninum is a coccidial protozoan parasite that infects a large range of mammals including dogs, cats, mice, and cattle. morphologically, n. caninum appears indistinguishable from toxoplasma gondii, although they are genetically distinct. to date there have been no reported cases of this infection in humans, although nonhuman primates may be susceptible to infection. inbred a/j mice develop no clinical and little histologic evidence of infection in spite of a high-dose inoculum of n. can ... | 1997 | 9024199 |
| cytologic identification of toxoplasma gondii in bronchoalveolar lavage fluid of experimentally infected cats. | to determine whether it was possible to retrieve organisms, by means of bronchoalveolar lavage (bal), from cats inoculated with toxoplasma gondii. | 1997 | 9054992 |
| long-term humoral antibody responses by various serologic tests in pigs orally inoculated with oocysts of four strains of toxoplasma gondii. | antibody titers to toxoplasma gondii were determined in 16 pigs orally inoculated with 1000 or 10,000 oocysts of one of the four strains (gt-1, me-49, ts-2, tc-2) of t. gondii. pigs were euthanized on postinoculation days 103-875 and their tissues were bioassayed for t. gondii. antibody titers were measured in the modified agglutination test (mat) using formalin-preserved (test a) or acetone-preserved (test b) tachyzoites, latex agglutination test (lat), indirect hemagglutination test (iha), enz ... | 1997 | 9066050 |
| toxoplasma pneumonia. | toxoplasma gondii, an obligate intracellular parasite, is the causal agent of significant morbidity and mortality worldwide. in the presence of a normal immune response, the pathogen becomes latent and the immunocompetent host remains chronically infected throughout life, often without clinical disease. in the case of the patient with the acquired immunodeficiency syndrome (aids) or other defects in cell-mediated immunity, the infection reactivates and is most often manifest as toxoplasmic encep ... | 1997 | 9097375 |
| bradyzoite-specific gene expression in toxoplasma gondii requires minimal genomic elements. | bag1 is a small heat-shock protein of toxoplasma gondii that is specifically expressed in the cyst-forming bradyzoite stage of the parasite. upregulation of bag1 mrna occurs early during the differentiation pathway from tachyzoites to bradyzoites. in order define genomic elements involved in bradyzoite-specific gene regulation, chloramphenicol acetyltransferase (cat)-reporter gene studies were performed with 5' flanking sequences of the bag1 gene. tachyzoites, transiently transfected with the ba ... | 1997 | 9108551 |
| toxoplasmosis: comparative species susceptibility and host immune response. | the protozoan parasite toxoplasma gondii is capable of infecting all warm blooded animals; however, the consequences of infection are very variable between different species of animal. marsupials and new world monkeys, which have evolved largely separately from the cat, the definitive host of the parasite, are among the most vulnerable species where infection with t. gondii can prove fatal. in more resistant species such as humans and sheep, infection is generally unapparent, provoking only mild ... | 1997 | 9208198 |
| isolation of coccidian enteroepithelial stages of toxoplasma gondii from the intestinal mucosa of cats by percoll density-gradient centrifugation. | a method for isolation of enteroepithelial stages of toxoplasma gondii from the intestinal mucosa of experimentally infected cats was developed using percoll density-gradient centrifugation. gamonts and merozoites were obtained essentially free of host-cell debris. a recovery rate of nearly 30% of the parasites in the original preparations was obtained by this method. merozoites were separated from gamonts by filtration through a 3-micron polycarbonate filter. | 1997 | 9211509 |
| tissue cyst tropism in toxoplasma gondii: a comparison of tissue cyst formation in organs of cats, and rodents fed oocysts. | the persistence of toxoplasma gondii tissue cysts in organs of cats (definitive host) and rodents (intermediate hosts) was studied. nine cats, 12 rats, and 12 mice were fed t. gondii oocysts and their organs were digested in pepsin and then bioassayed for bradyzoites in mice. of 9 cats killed 37 or 51 days after feeding 10(2) (2 cats), 10(3) (3 cats) or 10(4) (4 cats) oocysts of the veg strain, tissue cysts were found in each cat; in the tongue of 9, in the heart of 5, in the brain of 4, and in ... | 1997 | 9226953 |
| a serological survey of feline immunodeficiency virus and toxoplasma gondii in stray cats. | 1997 | 9232779 | |
| distribution of tissue cysts in organs of rats fed toxoplasma gondii oocysts. | toxoplasma gondii-infected rats are considered important in the epidemiology of toxoplasmosis because they can serve as a source of infection for pigs and possibly for cats. to study the distribution of tissue cysts, 10 sprague-dawley female adult rats were fed 1 oocyst (3 rats, group a) or 10(5) oocysts (3 rats, group b) of the veg strain or 10(4) oocysts of the gt-1 strain (4 rats, group c) of t. gondii. all rats in a group were killed at 1 time: 76 (group a), 240 (group b), and 443 (group c) ... | 1997 | 9267423 |
| elevated interleukin 6 activity in aqueous humor of cats with uveitis. | the purpose of this study was to assess the role of interleukin 6 (il-6) in feline uveitis by measuring il-6 activity in the serum and aqueous humor of cats. serum and aqueous humor was collected from clinically normal, random source cats (n = 10); clinically normal, specific-pathogen free cats experimentally inoculated with toxoplasma gondii strain me49 and sampled sequentially for 20 months (n = 4); and client-owned cats with uveitis (n = 27). interleukin 6 activity was measured in each sample ... | 1997 | 9343336 |
| low seroprevalence of toxoplasma gondii in feral pigs from a remote island lacking cats. | serum samples from 1,264 feral pigs from ossabaw island, georgia were initially screened for antibodies to toxoplasma gondii by the modified agglutination test (mat) using whole-formalinized tachyzoites and mercaptoethanol. seropositive samples were also tested by the sabin-feldman dye test, the latex agglutination test (lat), and the indirect hemagglutination test (ihat). ossabaw island is a remote, barrier island located southeast of savannah, georgia. antibodies to t. gondii were found in 11 ... | 1997 | 9379287 |
| oocyst-induced murine toxoplasmosis: life cycle, pathogenicity, and stage conversion in mice fed toxoplasma gondii oocysts. | the development of sporozoites to tachyzoites and bradyzoites was studied in mice after feeding 1-7.5 x 10(7) toxoplasma gondii oocysts. within 2 hr after inoculation (hai), sporozoites had excysted and penetrated the small intestinal epithelium. at 2 hai, most sporozoites were in surface epithelial cells and in the lamina propria of the ileum, and by 8 hai, t. gondii was also seen in mesenteric lymph nodes. at 12 hai, sporozoites had divided into 2 tachyzoites in the lamina propria of the small ... | 1997 | 9379292 |
| enzyme-linked immunosorbent assay for the detection of cryptosporidium parvum igg in the serum of cats. | the objective was to develop an enzyme-linked immunosorbent assay (elisa) for the detection of cryptosporidium parvum igg in the serum of cats. the elisa was an indirect elisa using soluble c. parvum oocyst antigens and a peroxidase-labeled anti-feline igg secondary antibody. sera from cats with toxocara felis, giardia spp., aelurostrongylus abstrusus, isospora felis, isospora rivolta, toxoplasma gondii, or taenia spp. infections were assayed in specificity studies. following optimization, the e ... | 1997 | 9379309 |
| toxoplasma gondii (eucoccidia: sarcoystidae) dissemination pattern in rats after oral infection with oocysts of an avirulent strain. | differences in toxoplasma gondii dissemination in white rats (sprague dowley) and mice (wistar) after oral oocyst inoculation are described. groups of five animals (both hosts) were infected per os with oocysts of the tcr-2 avirulent strain and the dissemination pattern was compared in brain tissue or by serology. early dissemination was similar in both species. one hr after infection the parasite was present in blood and peritoneal exudate as well as in heart, lung, liver, spleen, lymph nodes a ... | 1997 | 9404517 |
| interleukin-12, dendritic cells, and the initiation of host-protective mechanisms against toxoplasma gondii. | 1997 | 9417472 | |
| bradyzoite-induced murine toxoplasmosis: stage conversion, pathogenesis, and tissue cyst formation in mice fed bradyzoites of different strains of toxoplasma gondii. | the development of toxoplasma gondii was studied in mice fed bradyzoites. at one hour after oral inoculation (hai), bradyzoites were found in cells of the surface epithelium and the lamina propria of the small intestine, primarily the ileum. division into two tachyzoites was first observed at 18 hai in the intestine. at 24 hai, organisms were also seen in mesenteric lymph nodes. organisms were first detected in the brain at six days after oral inoculation with bradyzoites (dai) but not consisten ... | 1997 | 9435131 |
| sero-epidemiological studies on toxoplasma gondii infection in man and animals in bangladesh. | sera from randomly selected 49 professional blood donors, 617 pregnant women, 14 butchers, 528 slaughtered goats and 24 domestic cats in the district of mymensingh were tested for the presence of t. gondii antibodies using a latex agglutination test (lat). overall 12.4% blood donors, 11.18% pregnant women, 50.00% butchers, 12.88% slaughtered goats and 33.33% cats had diagnostically significant antibody titers (> or = 1:64) to t. gondii. epidemiological studies on t. gondii infection with lat wer ... | 1997 | 9444017 |
| positive evidence that anti-toxoplasma gondii iga antibody exists in the intestinal tract of infected cats and exerts protective activity against the infection. | the presence of anti-toxoplasma gondii iga antibody in the feces and intestinal tract of cats infected with this parasite was demonstrated using an immunoblotting assay. cats (n = 5) were inoculated orally with t. gondii cysts and supernatants of feces and washings of the intestinal tract were assayed for secretory iga specific for the parasite. the secretory iga detected recognized tachyzoite antigens of m.w. 24, 34, 38 and 43 kda and one sporozoite antigen of m.w. 24 kda. no reactivity was sho ... | 1997 | 9477486 |
| mechanical transmission of toxoplasma gondii oocysts by dogs. | two experiments were conducted to determine if dogs could mechanically transmit toxoplasma gondii after ingesting cat feces or by rolling in cat feces containing oocysts. in the first experiment, two dogs were fed sporulated t. gondii oocysts; viable sporulated oocysts were present in dog feces for up to 2 days postinoculation (pi). both dogs seroconverted to t. gondii but did not develop clinical signs of toxoplasmosis. in the second experiment, nonsporulated oocysts were placed on dog skin and ... | 1997 | 9477489 |
| re-examination of resistance of toxoplasma gondii tachyzoites and bradyzoites to pepsin and trypsin digestion. | the effect of digestion in trypsin and acid pepsin on toxoplasma gondii tachyzoites and bradyzoites was re-evaluated because of recent use of this method to distinguish tachyzoites from bradyzoites. toxoplasma gondii tachyzoites survived better in 0.5% trypsin solution for 1 h than in 1.0% solution, and occasionally survived for 2 h in acid pepsin solution. extracellular tachyzoites (> or = 1000) were also infectious orally to mice and cats. bradyzoites survived equally in trypsin and acid pepsi ... | 1998 | 9481773 |
| community study of toxoplasma antibodies in urban and rural schoolchildren aged 4 to 18 years. | to estimate the prevalence of toxoplasma antibodies in schoolchildren and their association with clinical and environmental data, antibody titres were measured in 1276 children aged 4 to 18 years attending primary and secondary schools. environmental and clinical data were obtained by questionnaire. altogether 12.8% (163/1276) of children had antibodies to toxoplasma gondii with no difference between the sexes. seroprevalence was higher in country children (16.6% (50/302)) than town children (10 ... | 1997 | 9487962 |
| shedding of toxoplasma gondii oocysts by felidae in zoos in the czech republic. | in 1995 and 1996, the shedding of toxoplasma gondii oocysts was monitored in the faeces of felidae in six zoos in the czech republic. in all, 2287 samples of faeces from 19 species of felidae were examined. in ostrava zoo, four episodes of shedding of toxoplasma-like oocysts were identified, using a flotation examination, in a pair of wild cats (felis silvestris), six episodes in a wild cat held separately, and three episodes in a pair of amur leopard cats (f. euptilurus). after the passage of s ... | 1998 | 9493305 |
| stable transgene expression in plasmodium falciparum. | plasmid vectors designed to express transgenes and a selectable marker in plasmodiumfalciparum were constructed. these consist of a selectable gene cassette comprising the toxoplasma gondii dihydrofolate reductase-thymidylate synthase (dhfr-ts) gene mutated to confer pyrimethamine resistance flanked by either plasmodium chabaudi dhfr-ts or p. falciparum calmodulin promoter sequences and the p. falciparum histidine rich protein 2 3' region. also, each vector includes a different expression casset ... | 1997 | 9497038 |
| parasites associated with pork and pork products. | three parasites pose a public health risk from the ingestion of raw or undercooked pork, namely: trichinella spiralis, taenia solium and toxoplasma gondii. inspection procedures, when practised according to prescribed methods, are effective in eliminating the majority of risks from t. spiralis and t. solium. no suitable methods for the post-slaughter detection of t. gondii are available. all three parasites are inactivated by various methods of cooking, freezing and curing; some information is a ... | 1997 | 9501363 |
| toxoplasma gondii infection in the mountain hare (lepus timidus) and domestic rabbit (oryctolagus cuniculus). i. pathology. | mountain hares and domestic rabbits infected experimentally with toxoplasma gondii were compared in respect of pathological changes and distribution of organisms in the tissues. seven hares and nine rabbits were each inoculated orally with 50 oocysts of the t. gondii tg-swef1 isolate and killed after one week to avoid adverse clinical effects. the only clinical sign observed was respiratory distress in a single hare. at necropsy, gross lesions, which occurred only in the hares, were found in the ... | 1997 | 9502271 |
| effect of gamma irradiation on unsporulated and sporulated toxoplasma gondii oocysts. | the effect of 137cs irradiation on unsporulated and sporulated toxoplasma gondii oocysts was investigated as a model system for sterilisation of fruit contaminated with other coccidia such as cyclospora or cryptosporidium. unsporulated oocysts irradiated at > or = 0.4 to 0.8 kgy sporulated but were not infective to mice. sporulated oocysts irradiated at > or = 0.4 kgy were able to excyst, and sporozoites were infective but not capable of inducing a viable infection in mice. toxoplasma gondii was ... | 1998 | 9559356 |
| phylogenetic analysis of coccidia based on 18s rdna sequence comparison indicates that isospora is most closely related to toxoplasma and neospora. | the phylogenetic relationships and taxonomic affinities of coccidia with isosporan-type oocysts have been unclear as overlapping characters, recently discovered life cycle features, and even recently discovered taxa, continue to be incorporated into biological classifications of the group. we determined the full or partial 18s ribosomal rna gene sequences of three mammalian isospora spp., isospora felis, isospora ohioensis and isospora suis, and a sarcocystis sp. of a rattlesnake, and used these ... | 1998 | 9561772 |
| toxoplasma gondii in vancouver island cougars (felis concolor vancouverensis): serology and oocyst shedding. | one of 12 necropsied cougars (felis concolor vancouverensis) from vancouver island, british columbia, canada, shed toxoplasma gondii oocysts confirmed by mouse bioassay. eleven of the 12 cougars (92%) had antibodies to t. gondii by the modified agglutination test with titers of <1:25 (1 cougar), 1:50 (8 cougars), and 1:500 (3 cougars). one additional cougar fecal sample collected from the victoria watershed environment also contained t. gondii oocysts. in 1995, the largest reported outbreak of h ... | 1998 | 9576522 |
| vertical transmission of toxoplasma gondii from chronically infected house (mus musculus) and field (apodemus sylvaticus) mice determined by polymerase chain reaction. | captive-bred mus musculus (house mice) and apodemus sylvaticus (field mice) were each infected with 50 oocysts of toxoplasma gondii m1 strain per os and infection in them and their offspring was assessed by polymerase chain reaction (pcr) amplification of the t. gondii b1 gene in brain tissue and by serology, using the modified agglutination test (mat). the chronically infected female a. sylvaticus (n = 10) and m. musculus (n = 23) were mated at least 6 weeks after infection (and subsequently to ... | 1998 | 9585931 |
| [toxoplasmic and chagasic meningoencephalitis in patients with human immunodeficiency virus infection: anatomopathologic and tomographic differential diagnosis]. | twenty-two hiv+ patients with encephalitis were studied. of these, 7 had meningoencephalitis due to toxoplasma gondii (mt) and 15 due to trypanosoma cruzi (mc). pathologic and computerized axial tomography (cat) changes were compared. we found that focal necrotizing encephalitis due to toxoplasma involved the cerebral cortex and the basal ganglia, whereas lesions due to trypanosoma cruzi were centered in the white matter, sometimes extending into the cortex. hemorrhages, myelin lesions and organ ... | 1998 | 9608234 |
| [congenital toxoplasmosis]. | introduction: toxoplasma gondii is a ubiquitous parasite of all species of mammals and birds (1). most often the infection in the immunocompetent persons is asymptomatic. symptoms (if present) are usually mild and self-limited. infection in the fetus and immunodeficient patients may lead up to clinically severe and often fatal toxoplasmosis (2). etiology: toxoplasma exists in three forms: oocysts, tissue cysts and tachyzoites. the definitive hosts of toxoplasma are members of the cat family. the ... | 1998 | 9611957 |
| prevalence of antibody to toxoplasma gondii in hyogo prefecture, japan: comparison at a 10-year interval. | we have previously surveyed antibody to toxoplasma gondii among japanese populations. in this report, we studied the current situation of antibody prevalence and compared it with the situation approximately 10 years before. a total of 1,800 human serum samples were collected at the central laboratory of kobe university hospital from june through september, 1995, and were examined for toxoplasma antibody using enzyme-linked immunosorbent assay. the overall prevalence was found to be 16.4% with si ... | 1997 | 9642971 |
| ultrastructure of the oocysts, sporocysts, and sporozoites of toxoplasma gondii. | transmission and scanning electron microscopy were used to study the ultrastructure of the oocysts, sporocysts, and sporozoites of the veg strain of toxoplasma gondii and to compare the ultrastructure of sporozoites with tachyzoites (from the peritoneum of mice) and bradyzoites (from brain tissue cysts in mice). oocysts were surrounded by a thin veil of finely reticulate material. the oocyst wall consisted of 3 layers and contained a previously unknown disc-shaped micropyle that appeared as a de ... | 1998 | 9645847 |