Gram stain of aspirate from oral abscess (x1000). Actinomyces frequently grows in aggregates, termed "sulfur granules." Note the branching, gram-positive filaments on the edge of this granule. Actinomyces is a fastidious obligate anaerobe requiring anaerobic culture.
Courtesy of Harriet Provine.
Graphic 81782 Version 4.0
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