Fachbereich Veterinärmedizin



    Pathobiology of Heterakis gallinarum mono-infection and co-infection with Histomonas meleagridis in layer chickens (2011)

    Zeitschriftenartikel / wissenschaftlicher Beitrag
    Schwarz, Anna
    Gauly, Matthias
    Abel, Hansjörg
    Daş, Gürbüz
    Humburg, Julia
    Weiss, Alexander T A
    Breves, Gerhard
    Rautenschlein, Silke
    Avian pathology : journal of the W.V.P.A; 40(3) — S. 277–287
    ISSN: 0307-9457
    DOI: 10.1080/03079457.2011.561280
    Pubmed: 21711187
    Institut für Tierpathologie

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    Abstract / Zusammenfassung

    Little is known about the induction and modulation of gut-associated immune reactions after nematode infection in the chicken. The objective of the present study was to compare the pathogenesis, induction of immune reactions and electrophysiological changes of the gut after mono-infection with Heterakis gallinarum and after dual infection with H. gallinarum and Histomonas meleagridis in layer chickens. In two experiments 3-week-old chickens were inoculated with embryonated H. gallinarum eggs, which were positive for H. meleagridis. While birds of the first experiment were left untreated, those of the second experiment were treated with dimetridazol to prevent H. meleagridis co-infection. Mild to moderate histological lesions and local immune reactions with a significant increase in CD4(+), CD8α(+), TCRαβ(+) and TCRδγ(+) cells in the lamina propria and induction of the T-helper type 2 (Th2) cytokine interleukin-13 dominated the H. gallinarum immune response at 2 weeks post infection. Co-infection with H. gallinarum and H. meleagridis induced an increase in mRNA expression of the T-helper type 1 (Th1) cytokine interferon-γ, a decrease in splenic CD4(+) cells and severe destruction of the caecal mucosa in association with strong T-cell infiltration in the caecal lamina propria. There was no obvious effect on the chloride secretion of the caecal epithelium, which was investigated once the mucosa had almost recovered from the infection, in either experiment. These results suggest that the local T-cell reactions to nematode infections in chickens may be comparable with mammals and may be shifted from a Th2-dominated to a Th1-dominated response when accompanied by a protozoan infection.