Any of a large and varied group of rod-shaped, often curved bacteria. Many can move, propelled by one or more flagella. Some aquatic species are attached to surfaces by long strands or stalks. Most are found in soil or water; some cause diseases in plants, and a few cause serious diseases in humans and other mammals. One very common and widespread species, Pseudomonas aeruginosa, is a serious cause of disease in humans, causing antibiotic-resistant infections in individuals with weakened resistance. Pseudomonads have been implicated in hospital-acquired infections of surgical wounds and severely burned tissue and in fatal infections of cancer patients treated with immunosuppressive drugs