Bacteria

Pasteurellaceae

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Pasteurellaceae, Pasteurellae, Haemophilus, Pasteurella, Actinobacillus, Pasteurella Multocida

  • See Also
  1. Gram Negative Bacteria
  2. Haemophilus Influenzae
  3. Haemophilus ducreyi
  4. HACEK Bacteria
  • Pathophysiology
  1. Pasteurellaceae is a family of facultative Anaerobic Gram Negative Rods
    1. Bacteria in the genus Haemophilus are coccobacilli
  2. Pasteurellaceae Bacteria are non-spore forming and non-motile
  • Types
  1. Genus: Pasteurella
    1. Pasteurella Multocida
      1. See Infected Cat Bite
      2. Facultatively anaerobic, Gram-negative, non-motile rod (or coccobacillus)
      3. Colonizes the mouth of animals and birds (esp. cats) with risk of Zoonosis
      4. Most common cause of an Infected Cat Bite
      5. May cause pneumonic pateurellosis (shipping fever) and hemorrhagic bacteremia
  2. Genus: Actinobacillus
    1. Actinobacillus actinomycetemcomitans (Periodontal Disease)
  3. Genus: Haemophilus (coccobacilli)
    1. Haemophilus Influenzae
      1. Now includes strains reclassified as non-typable biogroups (Haemophilus aegyptius, Haemophilus haemolyticus)
    2. Haemophilus ducreyi
      1. Causes Chancroid (painful Genital Ulcers and matted Lymphadenopathy)
    3. Less common Haemophilus species included in HACEK Bacteria (among the causes of Bacterial Endocarditis)
      1. Haemophilus parainfluenzae
      2. Haemophilus aphrophilus
      3. Haemophilus paraphrophilus
    4. Previously classified as Haemophilus, but now reclassified
      1. Gardnerella Vaginalis (previously Haemophilus Vaginalis, Corynebacterium Vaginale)
        1. Among the causes of Bacterial Vaginosis
        2. Facultatively anaerobic, Gram Positive, rod shaped Bacteria
        3. Cell wall is thin that takes up Gram Stain poorly, and may appear Gram Negative
        4. Unlike Haemophilus species, does not require X or V Factor for growth
  • References
  1. Gladwin, Trattler and Mahan (2014) Clinical Microbiology, Medmaster, Fl, p. 96-8, 107
  2. Musher (1996) Haemophilus Species in Baron, Medical Microbiology. 4th ed, Galveston
    1. https://www.ncbi.nlm.nih.gov/books/NBK8458/