Pseudomonas alcaligenes biovar A
An aerobic, oxidase-positive, gram-negative, bacillus that produces either a non-pigmented or a yellow pigmented colony. This isolate of Pseudomonas alcaligenes has been identified as belonging to biovar A. It has been isolated environmentally from water sources, including swimming pool water, contaminated milk, and from clinical specimens. It rarely is pathogenic to humans, but it can cause eye infections and empyema.