Lymph node: Mycobacterium avium-intracellulare

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Lymph node: <i>Mycobacterium avium-intracellulare</i>. Wellcome Collection. CC0 1.0 Universal. Source: Wellcome Collection.

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Mycobacterium avium-intracellulare (MAC) infection This is a high power view of a section of a lymph node from an HIV-positive adult with a Mycobacterium avium-intracellulare infection. The macrophages are spindle-shaped and contain abundant acid-fast bacilli (AFBs). There is no necrosis. This histology is similar to that of a histoid lesion in leprosy. Ziehl-Neelsen (ZN) stain.

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