1.   E. coli is a common gut bacteria that is normally harmless.

2.   Escherichia coli, a common gut bacterium that can cause diarrhea, which in rare cases can be fatal, is in this category.

3.   It is innocuous when ingested in moderate amounts by humans, animals or even beneficial gut bacteria.

4.   The adaptation by the insect of the bacterial-produced chemical, the researchers suggest, has wide implications for understanding the roles of gut bacteria in insects.

5.   The protective factor, a gut bacterium, was transmissible, he said.

6.   When a person dies, the intestinal wall eventually breaks down, and gut bacteria spill into the bloodstream and may lodge in distant tissues.

7.   We roped the dead pigs so that they could float or sink, depending upon what the gut bacteria did.

8.   When they isolated samples of the common gut bacteria Escherichia coli, they found that a quarter were resistant to the antibiotic streptomycin.