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The norovirus (NoV) is a highly infective and easily transmitted pathogen that imposes a significant public health burden across geographic regions as the causative pathogen for approximately 18% of all diarrhea cases worldwide. This report estimates the incidence of NoV diagnoses among active component service members during a 10-year surveillance period using medical record documentation of diagnoses of NoV infection and of positive laboratory tests for the virus. Findings During the 10-year surveillance period, there were 709 incident cases of NoV infection among active duty service members. •	The overall incidence rate was 5.7 cases per 100,000 person-years (p-yrs) •	Annual incidence rates ranged from a low of 2.5 cases per 100,000 p-yrs in 2008 to a high 11.2 cases per 100,000 p-yrs in 2010 •	Higher numbers of diagnosed cases were reported during November-March Graph depicting the above information displays. Overall rates were highest in: •	Female service members •	Persons Aged 24 years or younger •	Army members •	Junior enlisted •	Recruits Comparing the results of this analysis to modeled estimates of the underreported incidence of the NoV infections demonstrated the limited utility of using only medical encounter diagnoses, reportable events, and laboratory data to report on NoV incidence. Access the report in MSMR Vol. 24 No. 6 June 2017 at Health.mil/MSMR

This report estimates the incidence of norovirus diagnoses among active component service members during a 10-year surveillance period.

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Armed Forces Health Surveillance Branch

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