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Biomedical subjects

A Pospischil

Publications and source records attributed to A Pospischil.

At least 91 records · Page 5Linked to original sources
PubMed1991

Retrospective study of myocardial canine parvovirus infection by in situ hybridization.

The diagnosis of myocardial canine parvovirus (CPV) infection used to depend on the presence of pathognomonic intranuclear inclusion bodies. The in situ hybridization technique, however, allowed to detect CPV specific nucleic acid in myocardial tissue where no inclusion bodies were found. Hence, we applied this technique to check formalin-fixed paraffin-embedded myocardial tissue from puppies with heart lesions for the presence of CPV. The tissues had been collected between 1977 and 1989. A biotinylated probe was used for in situ hybridization. This way CPV specific nucleic acid was detected in 3 dogs where CPV myocarditis had not been diagnosed on routinely stained slides because of the lack of intranuclear inclusion bodies. However, in spite of the application of the in situ hybridization technique no further myocardial CPV infection was detected in puppies with heart lesions from after 1979, confirming that the number of puppies with myocardial CPV infection declined after that year.

Animals↗
PubMed1991

[Pathomorphology of feline dysautonomia (Key-Gaskell syndrome). Histologic, electron microscopic and immunohistologic findings in 4 cats].

The histopathologic, immunohistochemical and electronmicroscopic findings of four dysautonomic cats are presented. The main histopathologic changes were seen in the nervous system, e.g. in sympathetic and parasympathetic ganglia that were similarly affected. Acute cases showed a degeneration of most of the neurons, in one subacute case less neurons and degeneration of some of the remaining neurons were present. Degenerating neurons were swollen or shrunken and had pycnotic, eccentric nuclei. The Nissl substance was lost, the cytoplasma stained eosinophilic and was often vacuolated. Degenerating neurons were also seen in some nuclei of cranial nerves. In sympathetic ganglia numbers of glial cells were increased as shown by immunohistochemical markers (GFAP, S-100). The main ultrastructural changes in sympathetic ganglia were eccentric, crenated nuclei, loss of Nissl substance, loss of ribosomes, distended cisternae and vacuoles filled with floccular material. Circular stacks of parallel smooth-membranes and autophagic vacuoles were also often seen. No normal Golgi fields were seen. These findings closely resemble those already described for feline dysautonomia.

Animals↗
PubMed1990

Adhesive fimbriae produced in vivo by Escherichia coli O139:K12(B):H1 associated with enterotoxaemia in pigs.

Two strains of E. coli O139:K12 (B):H1 were compared in vitro and in the intestinal environment. Both strains colonized the small intestines of experimentally inoculated pigs and exhibited in vivo a similar relationship to the microvillus border as enterotoxigenic E. coli (ETEC). Strain 107/86 grown on blood agar expressed numerous long flexible non-haemagglutinating fimbriae which were antigenically distinct from the known fimbriae of porcine ETEC. It adhered in vitro to porcine enterocyte brush border fragments. Strain 124/76 grown on blood agar was devoid of fimbriae and did not adhere to brush border fragments. However, fimbriae morphologically and antigenically indistinguishable from those of strain 107/86 were detected in the intestinal environment by direct immunofluorescence and by immuno electron microscopy.

Animals↗
PubMed1990

[Electron microscopic morphometric studies of the development of peroxisomes in healthy piglets during the first 4 weeks of life].

The number of hepatic peroxisomes, cores, marginal plates, and microperoxisomes in piglets increases from a low level at birth, compared with other species e.g. the rat, to day 28 of life. The number of peroxisomes is correlated to the activity of uricase, but morphometry alone is not sufficient to quantitate uricase activity. These findings might explain the occurrence of renal uric acid deposition (infarction) during a catabolic state, where body protein is metabolized to an increased extent and purine levels rise. Due to a relative lack of uricase uric acid is not completely oxidised to allantoin.

Animals↗
PubMed1990

Peroxidase-antiperoxidase and immunogold labeling of Salmonella typhimurium and Salmonella choleraesuis var kunzendorf in tissues of experimentally infected swine.

Peroxidase-antiperoxidase immunoenzymatic labeling and immunogold labeling techniques were evaluated for microscopic detection and location of Salmonella organisms in tissues of experimentally infected swine. Salmonella typhimurium and Salmonella choleraesuis var kunzendorf were labeled specifically by the peroxidase-antiperoxidase technique in paraffin-embedded tissues of infected swine for conventional light microscopy and by postembedding immunogold labeling on ultrathin sections for electron microscopy. Salmonella typhimurium had a low tendency to invade the enteric mucosa and did not reveal any predilection for a specific intestinal location. Salmonella choleraesuis var kunzendorf, however, was located preferentially in colon and on the luminal surface of ileal M cells of Peyer patches and had a tendency to invade the enteric mucosa there.

Animals↗
PubMed1990

[Causes of death and disease in kittens].

Post-mortem examinations were carried out on 168 kittens 0 to 12 weeks of age. One third of the kittens died of an infectious agent, one third showed non infectious illnesses and in one third the examinations revealed none or vague results.

Animals↗
PubMed1989

Distribution of persistent Salmonella typhimurium infection in internal organs of swine.

Experiments were conducted to establish a persistent Salmonella typhimurium infection in convalescent swine, and to determine rate of shedding and distribution of the organism in internal organs. Naturally farrowed Salmonella-free pigs (n = 37) were orally exposed to S typhimurium when 7 to 8 weeks old. Fecal samples, tonsillar scrapings, and rectal swab specimens were examined bacteriologically for S typhimurium at weekly intervals after exposure until necropsy (maximum of 28 weeks after exposure). Necropsies of 1 to 4 randomly selected pigs were conducted at 2, 4, and 7 days and at 2, 4, 6, 8, 12, 16, 20, 24, and 28 weeks after exposure. The following internal organs were examined bacteriologically for S typhimurium: liver, spleen, kidney, gallbladder, heart, lung, and stomach; segments of the intestinal tract with corresponding lymph nodes; lymph nodes from lymphocenters of the head and neck, thoracic and abdominal cavities, pelvic wall, and thoracic and pelvic limbs. Fecal samples were 83 to 100% culture-positive up to postexposure (PE) week 22, then varied from 14 to 67% positive until PE week 28. At least 60% of tonsillar swab specimens and 50% of rectal swab specimens were culture-positive up to PE week 20, after which they varied from 0 to 70% positive until PE week 28. At necropsy, S typhimurium was recovered most frequently from tonsils (93.5% positive), followed by segments of the intestinal tract from caudal portion of jejunum to rectum (71% recovery from cecum), and mandibular (54.8%) and ileocolic (45.2%) lymph nodes.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗
PubMed1989

[Spontaneous mixed infections with distemper virus and Toxoplasma in dogs].

During a canine distemper epidemic in Switzerland in 1984/85 six cases of spontaneous mixed infections of distemper virus and Toxoplasma spec. were diagnosed. An etiologic diagnosis was made by immunohistological PAP-labelling. Pathological including histopathological findings are reported. The possibilities of histological identification of the organisms (H & E staining) are compared with immunohistology. The importance of spontaneous opportunistic infections involving protozoa is discussed.

Animals↗
PubMed1989

[Structure and function of Peyer's patches in the intestines of different animal species].

Structure and function of Peyer's patches in man and animals are compared reviewing reports of recent years. Differences exist regarding number and distribution of Peyer's patches along the small intestine and regarding distribution of m-cells of dome epithelium. M-cells trigger the contact between infectious organisms and intestinal epithelium. Several different ways of interaction are possible: 1. Selective uptake of organisms by m-cells. 2. Paracellular transport of organisms between m-cells. 3. Multiplication of organisms above dome epithelial areas. 4. Restriction of interaction between organism and mucosa to absorptive enterocytes. 5. Specific damage of organisms to lymphatic areas of Peyer's patches.

Animals↗
PubMed1987

Postnatal development of hepatic uricase and peroxisomes in baby pigs.

1. The activity of uricase, the densities of peroxisomes and cores in liver samples of baby pigs up to 4 weeks of age were investigated. 2. From 1 to 4 weeks of age, uricase activity as well as counts of cores and peroxisomes increased 5.5-, 3.3- and 2-fold. 3. Uricase activity and counts of cores and peroxisomes were correlated (P less than 0.001) with age in linear relationships. 4. Calculated for time of birth uricase activity was very low and ratio of cores to peroxisomes was 1:7. 5. From 0 to 28 days of age the calculated increases of uricase activity and counts of cores and peroxisomes were 178-, 10- and 3-fold.

Aging↗
PubMed1987

Attaching and effacing bacteria in the intestines of calves and cats with diarrhea.

Histopathologic and electron microscopic examination of intestines of three calves and two cats revealed attaching effacing bacteria characteristic of enteropathogenic Escherichia coli (EPEC) in ileum, cecum, and colon. The attaching effacing bacteria in one of the calves contained bacteriophages, and an E. coli isolate from that calf was shown to produce Shiga-like toxin. These findings contribute to emerging evidence that attaching effacing intestinal bacteria are globally distributed pathogens in a variety of host species and that bacteriophage-mediated production of Shiga-like toxin is related to the virulence of such bacteria.

Animals↗
PubMed1987

[Parvovirus enteritis in dogs based on autopsy statistics 1978-1985].

The occurrence of canine parvovirus enteritis was monitored in post mortem record from 1978-1985. In a total of 7,615 canine necropsies 654 cases of parvovirus enteritis were diagnosed. The number of cases rose considerably in 1980, accounting for about 10% of the total of canine necropsies since then. Seasonal distribution of cases shows a maximum in November, December, and January and a minimum in June, July and September. In German shepherds and Yorkshireterriers parvovirus enteritis is diagnosed with significantly higher frequency than in other breeds. 80% of all cases of parvovirus enteritis necropsied were diagnosed up to the age of 6 months.

Age Factors↗