Shigella causes diarrhea, sometimes bloody, that can last for 5 to 7 days. It is highly infectious and is spread from a person who is sick to another person via the fecal oral route. So hand washing is important. It is considered a foodborne pathogen, so food that has been handled by someone with Shigella can serve as a vector.
Keys to prevention - Exclusion of people who have the symptoms or who have been diagnosed, and proper hand washing.
US News and World Report
Drug-Resistant Stomach Bug Spreading Across the U.S.
By Kimberly Leonard April 2, 2015 | 5:26 p.m. EDT
Travelers are infecting Americans when they return home.
A recent, rapid spread of a diarrhea-causing bug that is immune to medicine has caused government health officials to issue a warning to travelers about their hygiene.