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Actinomyces species. A: Colony of Actinomyces species after 72 hours growth on brain–heart infusion agar, which usually yields colonies about 2 mm in
diameter; they are often termed “molar tooth” colonies. (Courtesy of CDC Public Health Image Library, L Georg.) B: Granule of Actinomyces species in
tissue with Brown and Breen stain. Original magnification ×400. Filaments of the branching bacilli are visible at the periphery of the granule. Such
granules are commonly called “sulfur granules” because of their unstained gross yellow color. (Courtesy of CDC Public Health Image Library.) C:
Actinomyces naeslundii in a brain abscess stained with methylamine silver stain. Branching bacilli are visible. Original magnification ×1000. (Courtesy of
CDC Public Health Image Library, L Georg.)
Source: Infections Caused by Anaerobic Bacteria, Jawetz, Melnick, & Adelberg’s Medical Microbiology, 27e
Citation: Carroll KC, Hobden JA, Miller S, Morse SA, Mietzner TA, Detrick B, Mitchell TG, McKerrow JH, Sakanari JA. Jawetz, Melnick, &
Adelberg’s Medical Microbiology, 27e; 2015 Available at: http://mhmedical.com/ Accessed: April 30, 2017
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