Is it ensure, insure, or assure?
shigellosis shig·el·lo·sis (shĭg'ə-lō'sĭs)
n. pl. shig·el·lo·ses (-sēz)
Dysentery caused by any of various species of Shigella, occurring most frequently in areas where poor sanitation and malnutrition are prevalent and commonly affecting children and infants.
infection of the gastrointestinal tract by bacteria of the genus Shigella. The illness produces cramplike abdominal pain as well as diarrhea consisting of either watery stools or scant stools containing mucus and blood