Definition: A genus of small, nonmotile, non-spore-forming, aerobic, facultatively anaerobic bacteria containing gram-negative rods interspersed with coccal elements. The metabolism of these bacteria is fermentative. They are pathogenic to animals. The type species is Actinobacillus lignieresii.
[actino- + L. bacillus, a little rod]
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Examples: glitazone, GI cocktail, etc.