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Hepatitis A is a liver infection caused by the hepatitis A virus (HAV). An estimated 1.4 million cases are reported worldwide each year. HAV is highly contagious and is a concern of the U.S. military as widespread outbreaks can occur due to contaminated food or water and spread by unsanitary food and water handling practices. This report estimates the frequencies, incidence rates, trends, and correlates of risk of hepatitis A among active component service members of the U.S. military during 2007 – 2016. Findings: During the 10-year surveillance period, there were 237 incident diagnoses of acute hepatitis A. The overall incidence rate was 1.88 cases per 100,000 person-years (p-yrs.). In 2012, rates peaked at 2.94 per 100,000 p-yrs. Rates dipped to 1.41 per 100,000 p-yrs. in 2015 and increased to 2.22 per 100,000 p-yrs in 2016. The graph shows the incident cases and incidence rates of acute Hepatitis A, by gender, active component, U.S. Armed Forces, 2007 – 2016. The bars on the graph show the number of individuals diagnosed and the lines show incidence rates per 100,000 p-yrs. See on page 3 FIGURE 1. Incident cases and incidence rates of acute hepatitis A, by gender, active component, U.S. Armed Forces, 2007–2016 of the  May 2017 MSMR Vol. 24 No. 5. Key chart includes: pink bar for number of female service members, blue bar for number of male service members, solid yellow line for incidence rate, and dash line for U.S. population rate. Source: www.cdc.gov/hepatitis/statistics/2014surveillance/index.htm#tabs-1170596-1  High Risks of Hepatitis A •	Youngest age group of service members •	Service members who work in healthcare occupations •	Air Force and Navy members •	Unknown race/ethnicity and non-Hispanic black service members HAV vaccines in current use are highly effective. Learn more at Health.mil/MSMRArchives  Small figure of male is seen on graphic with a circle highlighting his liver.

This infographic documents the frequencies, incidence rates, trends, and correlates of risk of hepatitis A among active component service members of the U.S. military during 2007-2016.

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Armed Forces Health Surveillance Branch

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