Haemophilus

Haemophilus

Not to be confused with Haemophilia.

Haemophilus
Haemophilus influenzae on a blood agar plate.
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Haemophilus
Winslow et al. 1917
Species

H. aegyptius
H. aphrophilus
H. avium
H. ducreyi
H. felis
H. haemolyticus
H. influenzae
H. parainfluenzae
H. paracuniculus
H. parahaemolyticus
H. pittmaniae
H. somnus
etc.

Haemophilus is a genus of Gram-negative, pleomorphic, coccobacilli bacteria belonging to the Pasteurellaceae family.[1][2] While Haemophilus bacteria are typically small coccobacilli, they are categorized as pleomorphic bacteria because of the wide range of shapes they occasionally assume. The genus includes commensal organisms along with some significant pathogenic species such as H. influenzae—a cause of sepsis and bacterial meningitis in young children—and H. ducreyi, the causative agent of chancroid. All members are either aerobic or facultatively anaerobic.

Contents

Metabolism

Members of the Haemophilus genus are typically cultured on blood agar plates as all species require at least one of the following blood factors for growth: hemin (factor X) and/or nicotinamide adenine dinucleotide (factor V). Chocolate agar is an excellent Haemophilus growth medium as it allows for increased accessibility to these factors.[3] Alternatively, Haemophilus is sometimes cultured using the "Staph streak" technique: both Staphylococcus and Haemophilus organisms are cultured together on a single blood agar plate. In this case, Haemophilus colonies will frequently grow in small "satellite" colonies around the larger Staphylococcus colonies because the metabolism of Staphylococcus produces the necessary blood factor by-products required for Haemophilus growth.

See also

References

  1. ^ Holt JG (editor) (1994). Bergey's Manual of Determinative Bacteriology (9th ed.). Williams & Wilkins. ISBN 0-683-00603-7. 
  2. ^ Kuhnert P; Christensen H (editors). (2008). Pasteurellaceae: Biology, Genomics and Molecular Aspects. Caister Academic Press. ISBN 978-1-904455-34-9. [1]. http://www.horizonpress.com/past. 
  3. ^ Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. ISBN 0-8385-8529-9. 

External links


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Look at other dictionaries:

  • Haemophilus — Kolonien von Haemophilus influenzae in einem Blutagar Systematik Domäne: Bakterien (Bacteria) …   Deutsch Wikipedia

  • Haemophilus — Haemophilus …   Wikipédia en Français

  • haemophilus — género de bacterias, gram negativos, de forma bacilar, de pequeño tamaño (0.4 mm), gram negativos, aeróbicos y susceptibles de pleomorfismo.Enfermedades causadas por el Haemophilus [ICD 10: B96.3] microfotografía [véase… …   Diccionario médico

  • Haemophilus —   [hɛ ] der, , eine Bakteriengattung; Haemophilus influenzae verursacht eine Pneumonie, die nach Infektion mit Influenzaviren (Virusgrippe) häufig als bakterielle Superinfektion auftritt …   Universal-Lexikon

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  • haemophilus — ● haemophilus ou hemophilus nom masculin Genre de bacilles à Gram négatif nécessitant, pour se développer, certains facteurs sanguins (hémine, ou facteur X ; NAD, ou facteur V) …   Encyclopédie Universelle

  • Haemophilus — vgl. Hämophilus …   Das Wörterbuch medizinischer Fachausdrücke

  • Haemophilus — Demande de traduction Haemophilus → Haemophilus …   Wikipédia en Français

  • Haemophilus —   Haemophilus …   Wikipedia Español

  • Haemophilus — Genus of tiny rod shaped bacteria. All are strict parasites occurring in the respiratory tracts of warm blooded animals, including humans, and in certain cold blooded animals. Some require oxygen, others do not. H. influenzae causes severe… …   Universalium

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