A sulfur granule is depicted in an abscess in a case of thoracic actinomycosis. The granules are composed of branched,
gram-positive filaments of Actinomyces israelii. Though these organisms resemble fungi morphologically, they are bacteria
of the Order Actinomycetes; they are anaerobic. They lack mycolic acid in cell walls and thus are not acid-fast.
From the slide collection of the late Dr. Charles Kuhn
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