 It can be an opportunistic pathogen in humans, affecting people with compromised immune systems, and is becoming increasingly important as a hospital-derived (nosocomial) infection.While other species of the genus "Acinetobacter" are often found in soil samples (leading to the common misconception that "A. baumannii" is a soil organism, too), it is almost exclusively isolated from hospital environments.Although occasionally it has been found in environmental soil and water samples, its natural habitat is still not known.