Actinobacillus hominis

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A gram-negative rod-shaped nonmotile anaerobic and facultative bacterium involved in respiratory tract infections of immunosuppressed individual.


Actinobacillus hominis in culture media shows grayish-white mucoid soft colonies with 1-2 micrometer in diameter without undergoing hemolysis on horse blood agar after 24hr incubation.

Actinobacillus hominis is relatively homogenous in structures that can be difficult to distinguish from other Actinobacillus species not unless extensive biochemical testing is carry out. It is mannose positive and found to be sensitive to various antibiotics including ampicillin, penicillin, erythromycin, tetracycline, ciprofloxacin, gentamicin and polymyxin.

Actinobacillus hominis is implicated in respiratory tract infections in immunosuppressed patients suffering from severe respiratory insufficiency with pleural empyema and bacteremia manifested with low-grade fever and pulmonary infiltrates.

Scientific classification:

 Kingdom: Bacteria
 Phylum: Proteobacteria 
 Class: Gammaproteobacteria
 Order: Pasteurellales
 Family: Pasteurellaceae
 Genus: Actinobacillus
 Species: Actinobacillus hominis 

See also:

• Bacteria

• Respiratory tract infections

• Bacteremia