This photograph depicts the colonial growth pattern displayed by Pseudomonas aeruginosa bacteria, also known as Bacillus pyocyaneus, growing on a blood agar plate.
Pseudomonas aeruginosa, an increasingly prevalent opportunistic human pathogen, is the most common Gram-negative bacterium found in nosocomial, or hospital-acquired infections. This germ is common in the environment, found in water and soil, and is often the cause of "hot tub rash".
Source: CDC
