期刊
DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
卷 26, 期 4, 页码 355-364出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0145-305X(01)00084-2
关键词
Salmonella; chicken; caecum; inflammation; immunohistochemistry
Dynamics of leucocyte infiltration and bacterial invasion in the caecal wall were studied after oral infection of 2-day-old chicks with Salmonella enterica ser. Enteritidis. Bacteria invaded the lamina propria. of the caecal wall from 12 h post-challenge onwards. Bacteriological examination of internal organs (liver, spleen) showed a peak in Salmonella bacteria at 3 days post-infection, after which the number of bacteria decreased. Immunohistochemistry revealed macrophages and T-lymphocytes invading the caecal propria mucosae from 24 h after challenge onwards, while B-lymphocytes came somewhat later, subsequently organising into follicular aggregates. An early increase in granulocytes was partly masked by the response to natural flora. While the B-lymphocyte and granulocyte populations were maintained, T-lymphocyte and macrophage populations were already reducing by 10 days post-challenge. The infiltration of macrophages and T-lymphocytes in the caecal wall, followed by B-lymphocytes, is the result of an inflammatory response, caused by invading bacteria at this site. The structural maturation of the mucosa-associated lymphoid tissues is antigen driven, since B-cells organise in a follicular pattern. (C) 2002 Elsevier Science Ltd. All rights reserved.
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