Signs and symptoms of shigella infection usually begin a day or two after contact with shigella. But it may take up to a week to develop. Signs and symptoms may include: 
Diarrhea (often containing blood or mucus)
Stomach pain or cramps
Fever
Nausea or vomiting
 Symptoms generally last for about five to seven days. In some cases, symptoms may last longer. Some people have no symptoms after they've been infected with shigella. However, their feces may still be contagious up to a few weeks.