Bovine Paratuberculosis
Mostrando 25-36 de 54 artigos, teses e dissertações.
-
25. Evaluation of four serological tests for bovine paratuberculosis.
The standard complement fixation (CF) test, a commercial agarose gel immunodiffusion (AGID) test (ImmuCell Corporation, Portland, Maine), and two commercial enzyme-linked immunosorbent assays (ELISAs; Allied Laboratories, Glenwood Springs, Colo. [Allied ELISA], and the CSL, Limited, [Parkville, Victoria, Australia] enzyme immunoassay [CSL ELISA]) were evalua
-
26. Comparison of Real-Time, Quantitative PCR with Molecular Beacons to Nested PCR and Culture Methods for Detection of Mycobacterium avium subsp. paratuberculosis in Bovine Fecal Samples
An automated PCR with fluorescent probes (molecular beacons) detected Mycobacterium avium subsp. paratuberculosis in bovine feces. When the PCR was compared with culture in testing 41 fecal samples, kappa scores of 0.94 to 0.96, a sensitivity of 93 to 96%, and a specificity of 92% were obtained. Results were quantitated by using a standard curve derived from
American Society for Microbiology.
-
27. Cultivation of Mycobacterium paratuberculosis from bovine fecal samples by using elements of the Roche MB Check system.
Components of a commercially available, nonradiometric, biphasic (liquid medium then solid medium) system for the detection of Mycobacterial species, Roche MB Check, were adapted for the isolation of Mycobacterium paratuberculosis from bovine fecal specimens. A two-stage culture procedure was developed in which processed fecal samples were incubated in modif
-
28. Enhanced radiometric detection of Mycobacterium paratuberculosis by using filter-concentrated bovine fecal specimens.
A commercial radiometric medium, BACTEC 12B, was modified by addition of mycobactin, egg yolk suspension, and antibiotics (vancomycin, amphotericin B, and nalidixic acid). Decontaminated bovine fecal specimens were filter concentrated by using 3-microns-pore-size, 13-mm-diameter polycarbonate filters, and the entire filter was placed into the radiometric bro
-
29. Progressive Bovine Paratuberculosis Is Associated with Local Loss of CD4+ T Cells, Increased Frequency of γδ T Cells, and Related Changes in T-Cell Function
Bovine paratuberculosis is caused by the infection of young calves with Mycobacterium avium subsp. paratuberculosis, resulting in a chronic granulomatous infection of predominantly the ileum. After an incubation period of 2 to 5 years, the disease becomes progressive in some of the chronically infected, but asymptomatic cows. This results in a protein-losing
American Society for Microbiology.
-
30. Development of a diagnostic test for Johne's disease using a DNA hybridization probe.
A DNA probe, M13 mpHAW71, that detects Mycobacterium paratuberculosis in the fecal material of infected animals was developed for use in the diagnosis of Johne's disease. The probe detected as few as 10(5) M. paratuberculosis when hybridized under stringent conditions to total genomic DNA purified from bovine fecal material. When the probe was used diagnosti
-
31. Rapid and Sensitive Detection of Mycobacterium avium subsp. paratuberculosis in Bovine Milk and Feces by a Combination of Immunomagnetic Bead Separation-Conventional PCR and Real-Time PCR
Immunomagnetic bead separation coupled with bead beating and real-time PCR was found to be a very effective procedure for the isolation, separation, and detection of Mycobacterium avium subsp. paratuberculosis from milk and/or fecal samples from cattle and American bison. Samples were spiked with M. avium subsp. paratuberculosis organisms, which bound to imm
American Society for Microbiology.
-
32. Identification and Characterization of a Novel Extracellular Ferric Reductase from Mycobacterium paratuberculosis
A novel extracellular mycobacterial enzyme was identified in the ruminant pathogen Mycobacterium paratuberculosis. The enzyme was capable of mobilizing iron from different sources such as ferric ammonium citrate, ferritin, and transferrin by reduction of the metal. The purified reductase had a calculated Mr of 17,000, was sensitive to proteinase K treatment,
American Society for Microbiology.
-
33. Characterization of Mycobacterium paratuberculosis by gas-liquid and thin-layer chromatography and rapid demonstration of mycobactin dependence using radiometric methods.
Thirty-six Mycobacterium paratuberculosis isolates of bovine, caprine, and ovine origins were evaluated by using gas-liquid chromatography (GLC), thin-layer chromatography (TLC), and BACTEC 7H12 Middlebrook TB medium (12A; Johnston Laboratories, Inc., Towson, Md.) in an effort to more rapidly differentiate this group of organisms from other mycobacteria. Bac
-
34. Molecular characterization of Mycobacterium paratuberculosis isolates from sheep, goats, and cattle by hybridization with a DNA probe to insertion element IS900.
Mycobactin J-dependent mycobacterial isolates from sheep, goat, and cattle herds with Johne's disease in Morocco, South Africa, the United States, and Germany were tested for the repetitive insertion sequence IS900 of Mycobacterium paratuberculosis by PCR. The IS900 PCR target sequence was detected in 90 of 93 fecal culture isolates tested (96.8%). Restricti
-
35. Characterization of Mycobacterium paratuberculosis and organisms of the Mycobacterium avium complex by restriction polymorphism of the rRNA gene region.
Nineteen Mycobacterium paratuberculosis strains, including strains of bovine, caprine, ovine, cervid, subhuman primate, and human origins, were compared with organisms of the M. avium complex by restriction fragment length polymorphism with a 5S rRNA gene probe as the reference DNA. Mycobacterial DNA was extracted, digested with several restriction enzymes,
-
36. Effects of physiol and chemical factors on the viability of Mycobacterium paratuberculosis.
Alternative methods of storing bovine fecal specimens for delayed culture of Mycobacterium paratuberculosis was studied. Significant (P less than 0.05) losses of viability were sustained by storage at 23 degrees C for 10 days and by treatment with 0.03 Zephiran for 4 and 10 days. Losses were moderate after storage at -70 degrees C for 15 weeks but significan