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- W2112314437 abstract "ABSTRACT Johne's disease (paratuberculosis) of cattle is widespread and causes significant economic losses for producers due to decreased production and poor health of affected animals. The chronic nature of the disease and the lack of a reproducible model of infection hinder research efforts. In the present study, instillation of Mycobacterium avium subsp. paratuberculosis into the tonsillar crypts of neonatal calves resulted in peripheral colonization as detected by antemortem culture of feces and postmortem (320 days postchallenge) culture of intestinal tissues. Antigen-specific blastogenic, gamma interferon (IFN-γ), and nitric oxide responses by blood mononuclear cells from infected calves exceeded prechallenge responses beginning 194 days postchallenge. Upon in vitro stimulation with paratuberculosis antigens, CD4 + cells from infected calves proliferated, produced IFN-γ, and increased expression of CD26 and CD45RO (indicative of an activated memory phenotype). Utilizing a lipoarabinomannan-based enzyme-linked immunosorbent assay, specific serum immunoglobulin was detected as early as 134 days postchallenge and generally increased after this time point. Two antigens of ∼50 and ∼60 kDa were particularly immunodominant early in infection, as shown by immunoblot with serum collected within 2 weeks postchallenge. Findings indicate that the intratonsillar inoculation route will prove useful as an experimental model for paratuberculosis infection. Additionally, this study confirms that mycobacteria-specific antibody is detectable early in the course of experimental Johne's disease, even preceding the development of specific cell-mediated responses." @default.
- W2112314437 created "2016-06-24" @default.
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- W2112314437 date "2003-09-01" @default.
- W2112314437 modified "2023-10-03" @default.
- W2112314437 title "Early Induction of Humoral and Cellular Immune Responses during Experimental<i>Mycobacterium avium</i>subsp.<i>paratuberculosis</i>Infection of Calves" @default.
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- W2112314437 doi "https://doi.org/10.1128/iai.71.9.5130-5138.2003" @default.
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