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Haemophilus haemolyticus

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A gram-negative non-pathogenic bacterium involved as a respiratory tract commensal organisms in human.


Haemophilus haemolyticus is measured as human commensal found in nasopharynx of children as well as in subgingival plaque. It is non-capsulated and nontypeable that distinguished from Haemophilus influenzae.

Haemophilus haemolyticus in culture media produces clear zone of beta-hemolysis on bovine, equine or horse blood agar but some strains do not produce hemolysis. It also produces hydrogen sulfide and acts as common inhabitants of the respiratory tract in human.

Haemophilus haemolyticus is a commensal bacterium that colonizes respiratory tract in human and is known to be closely related to pathogenic Haemophilus influenzae yet has been rarely noted to cause invasive disease. It is also implicated in chronic obstructive pulmonary diseases in adults and children but not causes an onset clinical symptom of exacerbation rather a commensal in the respiratory tract.

Scientific classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria
 Class: Gamma Proteobacteria
 Order: Pasteurellales
 Family: Pasteurellaceae
 Genus: Haemophilus
 Species: Haemophilus haemolyticus 

See also:

• Bacteria

• Hemolysis

• Commensal bacteria