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Actinobacillus  actinomycetemcomitans
One oral species: Actinobacillus actinomycetemcomitans
·Gram-negative
·Nonspore-forming
·Facultatively anaerobic
·Rods
There is one oral species of Actinobacillus.  It is Actinobacillus actinomycetemcomitans.  These organisms are Gram-negative, nonspore-forming, facultatively anaerobic rods.  They are 0.4-0.5 mm  wide by 1-1.5 mm long. 
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