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This report summarizes the counts, rates, and trends of Shigella infections in active component service members over the past 10 years. Findings •	During 2007 – 2016, there were 428 incident cases of Shigella infection among active duty service members. •	The overall incidence rate 3.4 cases per 100,000 person-years (p-yrs) •	 In 2015, the annual incidence rate peaked at 6.4 cases per 100,000 p-yrs – twice the rate in 2014 •	This peak was followed by a decrease to 3.4 cases per 100,000 p-yrs in 2016 Overall rates were highest in: •	Females •	Non-Hispanic black service member •	Persons aged 35-29 years •	Army members •	Service members in military healthcare occupations Diarrhea caused by bacteria of the Shigella genus is a major cause of morbidity and mortality worldwide. Shigella organisms can survive passage through the stomach because they are more resistant to acid than other bacteria. Shigella transmission can occur directly via person-to-person contact or indirectly through contaminated food, water or fomites (e.g., clothing bedding). The increasing antimicrobial resistance of Shigella species is a major problem in the treatment of Shigella gastroenteritis both in the United States and globally. Frequent and thorough hand washing with soap and water is an effective way to stop the spread of this and other enteric pathogens. Access the report in MSMR Vol. 24 No. 6 – June 2017 at Health.mil/MSMR Graphic features images of Shigella bacteria, human stomach, Earth, and hands. Additional images are clothing, contaminated food and water as common sources for Shigella transmission.

This report summarizes the counts, rates, and trends of Shigella infections in active component service members over the past 10 years.

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Armed Forces Health Surveillance Branch

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