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Capnocytophaga spp.

Capnocytophaga spp. is a topic covered in the Johns Hopkins ABX Guide.

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  • C. canimorsus (previously known as DF-2, dysgonic fermenter) and C. cynodegmi (previously known as DF-2 like organism) are facultatively anaerobic Gram-negative rods, part of normal oral flora of dogs and cats.
    • C. cynodegmi is considered less virulent than C. canimorsus.
    • Other Capnocytophaga species may be part of animal oral flora, or normal human oral flora/dental plaques, e.g., C. sputigena, C. canis, C. endodontalis sp. nov. and C. gingivalis.
  • Organisms have a long, fusiform appearance on gram stain, making it distinctive enough to consider morphologic identification pending cx results.
  • Organisms considered fastidious by the micro lab.
  • Most strains are resistant to polymyxin, fusidic acid, fosfomycin and trimethoprim.

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Last updated: May 5, 2019


Auwaerter, Paul. "Capnocytophaga Spp." Johns Hopkins ABX Guide, The Johns Hopkins University, 2019. Pediatrics Central, peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540078/5/Capnocytophaga_spp_.
Auwaerter P. Capnocytophaga spp. Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540078/5/Capnocytophaga_spp_. Accessed June 24, 2019.
Auwaerter, P. (2019). Capnocytophaga spp. In Johns Hopkins ABX Guide. Available from https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540078/5/Capnocytophaga_spp_
Auwaerter P. Capnocytophaga Spp [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2019. [cited 2019 June 24]. Available from: https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540078/5/Capnocytophaga_spp_.
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TY - ELEC T1 - Capnocytophaga spp. ID - 540078 A1 - Auwaerter,Paul,M.D. Y1 - 2019/05/05/ BT - Johns Hopkins ABX Guide UR - https://peds.unboundmedicine.com/pedscentral/view/Johns_Hopkins_ABX_Guide/540078/5/Capnocytophaga_spp_ PB - The Johns Hopkins University DB - Pediatrics Central DP - Unbound Medicine ER -