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Actinobacillus  actinomycetemcomitans
First isolated from human cases of actinomycosis concomitantly (together) with Actinomyces, hence the name
It is usually abbreviated unofficially as A.a.
This species was first isolated from human cases of actinomycosis or concomitantly (meaning together) with actinomyces, hence the name.  It is usually abbreviated unofficially as A. a.
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