The shigella infection is an intestinal disease caused by a family of bacteria known as shigella. Shigella can be passed through eating contaminated food or by drinking or swimming in contaminated water.
Foods most often associated with the shigella disease are salads and sandwhiches, which require a lot of hand contact in their preparation, and raw vegetables contaminated in the field.
The symptoms that it causes is cramping, fever, diarrhea, nausea, & vomiting.
To prevent it you can wash your hands carefully and frequently, dispose of soiled diapers properly, disinfect diaper changing areas after using them, and do not prepare foods while ill.