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The Department of Defense (DoD) conducts year-round influenza surveillance for military healthcare beneficiaries and select civilian populations. Data from routine respiratory surveillance are used to estimate mid-season influenza vaccine effectiveness (VE) and these findings are shared at the Food and Drug Administration’s advisory committee meeting on U.S. influenza vaccine strain selection. DoD VE estimates from the Defense Health Agency’s Armed Forces Health Surveillance Branch (AFHSB) and Naval Health Research Center (NHRC) are presented in this report. Findings • For all influenza types: VE was 42% as found by AFHSB-Air Force Satellite Cell, similar to NHRC’s overall VE of 45% • Influenza A (H3N2) VE was 42% by AFHSB-AF estimation and VE was 46% as estimated by NHRC • VE for Influenza B was slightly higher at 53% as estimated by AFHSB-AF • AFHSB analysis found that VE against influenza A was 3% and VE against influenza A (H3N2) was 33% Table showing the mid-season influenza effectiveness estimates, 2016 –2017 displays. The mid-season influenza VE estimates indicated that vaccination reduced the odds of medically attended influenza infection by approximately 45% among DoD dependents and civilians. Access the full report in MSMR Vol. 24 No. 8 August 2017 at Health.mil/MSMR Three photos display on this infographic: 1. An elderly woman receiving a flu show from a female service member 2. Female service member receives a flu shot 3. Male physician hold a flu shot

This infographic documents Department of Defense mid-season influenza vaccine effectiveness estimates from the Defense Health Agency’s Armed Forces Health Surveillance Branch and Naval Health Research Center for the 2016 – 2017 influenza season.

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