Johne’s Disease or paratuberculosis is a mycobacterial infection of ruminants and has global economical impact. Mycobacterium avium subsp. the cause this disease. It reduces milk production, chronic weight loss leading death major losses. Acute phase reactions are defined as minimum 25% increase decrease in serum concentrations acute proteins which triggered by pro antiinflammatory cytokines re...

Sera from cattle naturally infected with Mycobacterium avium subsp. paratuberculosis (n = 56) and naturally (n = 4) and experimentally (n = 8) infected with Mycobacterium bovis were tested for the presence of antibodies against paratuberculosis antigens. An enzyme-linked immunosorbent assay (ELISA) was established based on absorption of M. avium subsp. paratuberculosis antigens on a hyperimmune...

A cross-sectional study was performed to determine the odds of having a positive paratuberculosis ELISA result if the dam was ELISA positive in Texas beef cattle, adjusted for individual and herd-level risk factors for seropositivity. Texas beef cattle (n = 2,621) were tested for paratuberculosis by using a commercial ELISA and microbiologic culture of feces for Mycobacterium avium subsp. parat...

Mycobacterium avium subsp paratuberculosis (Map), the causative agent of Johne's disease, has a robust ability to survive in the environment. However, the ability of Map to migrate through soil to drainage tiles or ground water, leave the farm, and leak into local watersheds is inadequately documented. In order to assess the ability of Map to leach through soil, two laboratory experiments were ...

Vaccination for Johne's disease with killed inactivated vaccine in cattle herds has shown variable success. The vaccine delays the onset of disease but does not afford complete protection. Johne's disease vaccination has also been reported to interfere with measurements of cell-mediated immune responses for the detection of bovine tuberculosis. Temporal antibody responses and fecal shedding of ...

An enzyme-linked immunosorbent assay (ELISA) was performed for diagnosis of paratuberculosis in goats, using as antigen a protoplasmic extract (PPA-3). The test was developed on the basis of the results obtained with two serum reference pools, positive and negative respectively. To avoid day-to-day variations, dilutions of the positive serum pool were included in each plate to obtain an arbitra...

OBJECTIVE To evaluate the seroprevalence of paratuberculosis by use of 2 commercial ELISAs in association with prevalence of fecal shedding of mycobacteria within beef cattle herds. DESIGN Cross-sectional field study. ANIMALS Six beef herds (affected herds; 522 cattle) with and 3 geographically matched herds (181 cattle) without high seroprevalence of paratuberculosis. PROCEDURES Blood an...

The aim of this study was to evaluate a wide panel of antigens of Mycobacterium avium subsp. paratuberculosis (MAP) to select candidates for the diagnosis of paratuberculosis (PTB). A total of 54 recombinant proteins were spotted onto nitrocellulose membranes and exposed to sera from animals with PTB (n = 25), healthy animals (n = 10), and animals experimentally infected with M. bovis (n = 8). ...

Mycobacterium avium subsp. paratuberculosis is the etiologic agent of Johne's disease, a chronic intestinal infection in ruminants. Adenosine 5'-Triphosphate (ATP) has been reported to induce killing of several Mycobacterium species in human and murine macrophages. We investigated whether ATP secreted from M. avium subsp. paratuberculosis-infected bovine monocytes affects intracellular survival...

Crohn's Disease (CD) in humans and Johne's disease in cattle both involve a chronic granulomatous enteritis primarily in the small intestine. Symptoms of these diseases are similar to those of intestinal tuberculosis (caused by Mycobacterium tuberculosis), and the agent responsible for Johne's disease is known to be Mycobacterium paratuberculosis. The etiology of CD has so far defied explanatio...