Haemophilus parainfluenzae

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Haemophilus parainfluenzae
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gammaproteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Haemophilus
Species: parainfluenzae

Haemophilus parainfluenzae is a species of Haemophilus.

It is one of the HACEK organisms.[1] H. parainfluenzae is an opportunistic pathogen that has been associated with endocarditis, bronchitis, otitis, conjunctivitis, pneumonia, abscesses and genital tract infections.

Natural genetic transformation[edit]

H. parainfluenzae biotypes I and II are capable of natural genetic transformation.[2] Natural genetic transformation is a bacterial adaptation for DNA transfer. In order for a bacterium to bind, take up and recombine exogenous DNA into its genome it must enter a special physiological state termed natural competence. In H. parainfluenzae, competence is induced during the late stationary phase of growth.[2] Natural DNA transformation may play a major role in the exchange of genetic information among H. parainfluenzae isolates.


  1. ^ HACEK Group Infections at eMedicine
  2. ^ a b Gromkova RC, Mottalini TC, Dove MG (1998). "Genetic transformation in Haemophilus parainfluenzae clinical isolates". Curr. Microbiol. 37 (2): 123–6. PMID 9662612. 

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