Actinomyces is a topic covered in the Johns Hopkins ABX Guide.

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MICROBIOLOGY

  • Thin, branching (filamentous or beaded) Gram-positive bacillus [Fig 1].
    • Microaerophilic, grow best anaerobically.
    • VERY fastidious, often does not grow in culture.
  • Agents: A. israelii, A. naeslundii, A. odontolyticus, A. viscosus, A. meyer and Propionibacterium propionicum and A. gereneseriae.
    • Virtually all cases are mixed infections with other bacteria including Eikenella corrodens, Bacteroides spp, S. aureus, Streptococcus spp., Aggregatibacter actinomycetemcomitans, and/or Fusobacterium sp.
    • Normal flora of mouth, gut, genital tract.
  • Diagnosis is often made by histopathology -- not by culture, even when suspected.

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Last updated: December 6, 2018

Citation

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TY - ELEC T1 - Actinomyces ID - 540005 A1 - Bartlett,John,M.D. AU - Fabre,Valeria,M.D. Y1 - 2018/12/06/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540005/all/Actinomyces PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -