Epidemiology of Shigellosis

What are the epidemiologic features and species most commonly associated with shigellosis? 

Shigella infections in developed countries such as the United States are more commonly associated with Shigella sonnei strains. Shigella flexneri infections are more common in developing countries and are the second most common Shigella species isolated from patients in the United States. Shigella dysenteriae is less common but can cause of a more severe infection and epidemic dysentery. In the United States, shigellosis is most commonly associated with children in daycare settings, institutionalized individuals, and among men who have sex with men. Shigellosis is also an important cause of watery diarrhea and dysentery among travelers.


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