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Field vole with M. microti tuberculosis. Liver with small focal granulomatous infiltrates (arrows) composed of lysozyme-positive macrophages (upper inset) and T cells (CD3+; lower inset). Small foci of mineralization (arrowheads) are present. HE stain and peroxidase anti-peroxidase method, Papanicolaou hematoxylin counterstain.
