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