Usually within 2 to 5 days. Illness can last up to 10 days, but relapses are not uncommon. Generally, infected people will carry the bacteria for weeks. Although anyone can become infected, children and young adults are most susceptible. Children, the elderly and people with weakened immune systems are more likely to have severe complications.
Most people recover on their own or simply require fluids to prevent dehydration.
Antibiotics are occasionally used to treat severe cases or to shorten the time a person is contagious. Since relapses occasionally occur, antibiotics can be used to prevent a recurrence of symptoms. It is the most common bacterial cause of diarrheal illness in Washington. There were 1050 cases in 1995. Avoid improperly prepared foods and practice sanitary food preparation.