Acinetobacter
Background
Acinetobacter baumannii is a pleomorphic aerobic gram-negative bacillus (similar in appearance to Haemophilus influenzae on Gram stain) commonly isolated from the hospital environment and hospitalized patients. A baumannii is a water organism and preferentially colonizes aquatic environments. It is also a natural inhabitant of soil. This organism is often cultured from hospitalized patients' sputum or respiratory secretions, wounds, and urine. In a hospital setting, Acinetobacter commonly colonizes irrigating solutions and intravenous solutions.
The Acinetobacter has more than 50 species, most of which are nonpathogenic environmental organisms. The most common infection-causing species is A baumannii, followed by Acinetobactercalcoaceticus and Acinetobacterlwoffii
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