Intestinal bacteria (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">intestinal bacteria</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for e coli that I've seen before include "Some types of this bacterium are toxic" , "Common species of bacterium" , "An infection found in food and water" , "cause of serious complaint" , "cause of ill-feeling" .)
(Another definition for ecoli that I've seen is " Bacterium".)