This microbe is frequently isolated from spinal fluid, respiratory system, blood and wounds of humans, and is an opportunistic pathogen likely causing meningitis, brain abscesses, and bacteremia in neonates. It can also be isolated from natural environments, such as sewage, soil, and foods. Recent recalls of baby formula and tampons were due to contamination with this microbe. More commonly, it is the cause of gastroenteritis in adults. It is a Gram negative straight rod occurring in singles and pairs, which exhibits motility using peritrichous flagella. Gas is produced from glucose. Growth is at 35-37 C.