Haemophilus is a genus of Gram-negative pleomorphic coccobacilli bacteria.^[1] 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 strains such as H. influenzae—a cause of septicemia and bacterial meningitis in young children—and H. ducreyi, the causative agent of chancroid. Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms (as opposed to folk taxonomy). ... Phyla/Divisions Actinobacteria Aquificae Bacteroidetes/Chlorobi Chlamydiae/Verrucomicrobia Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Nitrospirae Omnibacteria Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Bacteria (singular, bacterium) are a major group of living organisms. ... Orders Alpha Proteobacteria    Caulobacterales - e. ... Genera Actinobacillus Haemophilus Lonepinella Pasteurella Phocoenobacter The Pasteurellaceae are a family of Proteobacteria, given their own order. ... Genera Actinobacillus Haemophilus Lonepinella Pasteurella Phocoenobacter The Pasteurellaceae are a family of Proteobacteria, given their own order. ... Binomial name Haemophilus ducreyi A chancroid is an STD characterized by painful sores on the genitalia. ... Binomial name Haemophilus influenzae Lehmann & Neumann, 1896 Haemophilus influenzae, formerly called Pfeiffers bacillus or Bacillus influenzae, is a non-motile Gram-negative coccobacillus first described in 1892 by Dr. Robert Pfeiffer during the influenza pandemic. ... Bacteria that are Gram-negative are not stained dark blue or violet by Gram staining, in contrast to Gram-positive bacteria. ... This page is a candidate to be copied to Wiktionary. ... Coccobacillus is the singular of coccobacilli, which are bacteria of a slightly elongated shape. ... ‹ The template below has been proposed for deletion. ... In ecology, commensalism is an interaction between two living organisms, where one organism benefits and the other is not affected. ... A pathogen (literally birth of pain from the Greek παθογένεια) is a biological agent that can cause disease to its host. ... Binomial name Haemophilus influenzae Lehmann & Neumann, 1896 Haemophilus influenzae, formerly called Pfeiffers bacillus or Bacillus influenzae, is a non-motile Gram-negative coccobacillus first described in 1892 by Dr. Robert Pfeiffer during the influenza pandemic. ... Binomial name Haemophilus ducreyi A chancroid is an STD characterized by painful sores on the genitalia. ... Binomial name Haemophilus ducreyi A chancroid is an STD characterized by painful sores on the genitalia. ...

Haemophilus species are classified by characterization of their capsule: seven serogroups exist, a—f and e′.^[2] Capsule type b (Hib) is the most clinically significant because of its virulence. The word capsule (from the Latin capsula, a small box), has many similar meanings in English: In botany, a capsule is a type of dry fruit as in the poppy, iris, foxglove, etc. ... This page is a candidate to be copied to Wiktionary using the Transwiki process. ...

Matabolism

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: factor X (hemin) and/or factor V (nicatinamide adenine dinucleotide). Chocolate agar is an excellent Haemophilus growth media 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 Staphylococccus colonies because the metabolism of Staphylococcus produces the necessary blood factor by-products required for Haemophilus growth. An agar plate is a sterile Petri dish that contains agar plus nutrients, and is used to culture bacteria or fungi. ... Wikibooks Transwiki has more about this subject: Agar plate An agar plate streaked with microorganisms isolated from a deep-water sponge. ... An agar plate is a sterile Petri dish that contains agar plus nutrients, and is used to culture bacteria or fungi. ...

References

1. ^ Holt JG (editor) (1994). Bergey's Manual of Determinative Bacteriology, 9th ed., Williams & Wilkins. ISBN 0-683-00603-7.
2. ^ Musher DM (1996). Haemophilus Species. In: Baron's Medical Microbiology (Barron S et al, eds.), 4th ed., Univ of Texas Medical Branch. (via NCBI Bookshelf) ISBN 0-9631172-1-1.
3. ^ Ryan KJ; Ray CG (editors) (2004). Sherris Medical Microbiology, 4th ed., McGraw Hill. ISBN 0838585299.

External links

• Haemophilus chapter in Baron's Medical Microbiology (online at the NCBI bookshelf).