Pseudomonas aeruginosa is a nonfermentative gram-negative bacillus. This bacterium is ubiquitous in soil and water, and on surfaces in contact with soil or water. Pseudomonas aeruginosa is an opportunistic pathogen, meaning that it exploits some break in the host defenses to initiate an infection. It causes urinary tract infections, respiratory system infections, dermatitis, soft tissue infections, bacteremia, bone and joint infections, gastrointestinal infections and a variety of systemic infections, particularly in patients with severe burns and in cancer and AIDS patients who are immunosuppressed.
Key characteristics: Gram(-), catalase(+), oxidase(+), motility(+), aerobic, produces pigments (green and blue), grows at 42°C.