<prompt> Which of the following organism does not cause invasive diarrheaBacillus cereusAeromonasspRota virusShigella  <response>: Answer is A Bacillus cereus Bacillus cereus causes non invasive diarrhea secondary to small bowel hypersecretion, as a result of preformed bacterial toxins. Rotavirus, Aeromonas sp and Shigella are all invasive organism known to cause invasive diarrhea. 