Abstract
Goats, both in late pregnancy and soon after parturition, were inoculated intravenously with Brucella abortus, and mammary glands and supramammary lymph nodes were examined by light and electron microscopy at 2 to 55 days post-inoculation. After 7 days, lymphoplasmacytic, histiocytic interstitial mastitis with a lobular and periductal distribution were detected microscopically. Brucellae, identified in tissues with immunoperoxidase staining and antibody-coated colloidal gold stain, were first seen in macrophages and neutrophils throughout mammary parenchyma, but most commonly in mammary alveoli. In subsequent samples, infected phagocytes progressively increased in number, especially in ductal and alveolar lumina, and adjacent parenchyma. B. abortus was in phagosomes and phagolysosomes in macrophages and neutrophils; degenerate and necrotic phagocytes were often filled with brucellae. Extracellular brucellae were associated with ruptured necrotic infected phagocytes. Supramammary lymph nodes draining infected mammary glands were enlarged. Lymphofollicular hyperplasia, medullary plasmacytosis, and sinus histiocytosis were seen microscopically. Brucellae were seen exclusively in macrophages, which were most often located in subcap...Continue Reading
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