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Shigella is a type of bacteria that infects the intestinal tract. Four different groups of Shigella can affect humans, with some causing a mild illness and others a more severe one.
About 18,000 cases of Shigella infection are diagnosed each year in the United States, but many more go unreported because they involve only mild symptoms and sometimes no symptoms at all. The infection is most common during the summer months. Shigella rarely infects infants younger than 6 months old, but it is common in children 2 to 4 years old, especially those in child care.
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