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Bifidobacterium infantis is a member of the bifidobacteria family, a strain of bacteria that is normally found in the human intestines. Because these bacteria do not normally cause infections, they can be used in probiotic supplements, which can aid in intestinal health and help prevent infections.Bifidobacerium is a rod-shaped anaerobic bacteria, according to Kenyon University, which means that it cannot grow in the presence of oxygen. It is normally found in the intestines and is able to break down sugars into lactic acid. This bacteria is also able to use some "indigestible" plant compounds, including some proteins and cellulose, for fuel. Its ability to use many different compounds as food allows it to thrive in the digestive tract and compete with potentially harmful bacteria for space and resources in the gut.