An aerobic gram-negative bacillus that grows readily on most microbiological media producing a white colony with either a smooth or a mucoid consistency. It is the most frequent Enterobacter species isolated from humans and animals. It is part of the normal intestinal flora of humans and animals and has been isolated from soil, water, sewage, meat and the hospital environment.. It is capable of causing infections in humans (meningitis, septicemia, abscesses), especially in debilitated individuals. It is an important cause of nosocomial (hospital-acquired) infections.