11.   Never before has a virus been shown to produce such a substance, known as an enterotoxin, though enterotoxins made by bacteria have been studied extensively.

12.   Not all bacteria make the protein, and he and his colleagues found that only the strains that did were able to provoke strong responses in the animals.

13.   Only when this protein has been pried loose from the DNA can bacteria make the enzymes they need to digest lactose.

14.   Q. If I eat a lot of yogurt, will the bacteria in it make me sick?

15.   The bacteria make lactic acid that eats away at teeth.

16.   These bacteria not only make edible products, they crowd out harmful microbes that would lead to spoilage.

17.   Today, though, those bacteria can make life miserable for swimmers or others who ingest enough of the tainted water.

18.   Evidence comes in the form of several telltale signs on how the bacteria can make its way out of the lungs into the bloodstream.

19.   If the bacteria make people sick and they seek treatment, fluoroquinolones will be far less effective than normal.