Name a bacteria that does not cause disease?

Answer 1

In general bacteria that cause disease are called pathogenic bacteria. The ones that do not cause disease are often referred to as "healthy" bacteria or "good bacteria" See Related Links for a good discussion on types of bacteria.

The strain of E. Coli that lives in the mammalian gut does not cause any disease unless it were transplanted to elsewhere in the body.-- That means is DOES cause disease. Sorry,,had to add that because your answer was misleading.

Bifidobacterium dentium. It is found in the digestive system and is thought to produce GABA, a naturally produced pain relieving agent and neurotransmitter in the human body.

Answer 2

Lactobacillus is a type of bacteria commonly found in the gut and is considered beneficial for digestion. It helps maintain a healthy balance of bacteria in the gut and is also used in the fermentation of foods like yogurt.