Color enhanced scanning electron micrograph (SEM) of Pseudomonas aeruginosa. This versatile gram-negative bacterium grows in soil, marshes, and coastal marine habitats, as well as on plant and animal tissues. People with cystic fibrosis, burn victims, individuals with cancer, and patients requiring extensive stays in intensive care units are particularly at risk of disease resulting from P. aeruginosa infection. Magnification 5,500x at 4x4 inches.