The Burden of Arboviral Infections in the Military Health System 2012–2019

Trevor Wellington Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, Maryland;
Clinical Trials Center, Walter Reed Army Institute of Research, Silver Spring, Maryland;
1 stArea Medical Laboratory, Aberdeen Proving Grounds, Maryland;

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Jamie A. Fraser Infectious Disease Clinical Research Program, Department of Preventive Medicine and Biostatistics, Uniformed Services University of Health Sciences, Bethesda, Maryland;
Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland;

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Huai-Ching Kuo Infectious Disease Clinical Research Program, Department of Preventive Medicine and Biostatistics, Uniformed Services University of Health Sciences, Bethesda, Maryland;
Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, Maryland;

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Patrick W. Hickey Department of Pediatrics, Uniformed Services University of Health Sciences, Bethesda, Maryland;

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David A. Lindholm Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, Maryland;
Infectious Disease Service, Department of Medicine, Brooke Army Medical Center, Fort Sam Houston, Texas

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ABSTRACT.

Arboviral infections, including dengue (DNV), chikungunya (CHIKV), and Zika (ZIKV), impact both travelers and native populations of endemic regions. We sought to assess the disease burden of arboviral infections in the Military Health System, the validity of arboviral diagnostic codes, and the role of pretravel counseling on insect avoidance precautions. We searched for diagnostic codes consistent with arboviral infection and grouped them into DNV, CHIKV, ZIKV, Japanese encephalitis virus (JEV), and Other. Demographic data were evaluated. A subset of charts in each category were reviewed for diagnostic validity and travel characteristics. In all, 10,547 unique subjects carried 17,135 arboviral diagnostic codes, including 1,606 subjects (15.2%) coded for DNV, 230 (2.2%) for ZIKV, 65 (0.6%) for CHIKV, and 4,317 (40.9%) for JEV. A chart review was performed on 807 outpatient charts, yielding outpatient diagnostic code positive predictive values of 60.5% (DNV), 15.3% (ZIKV), and 64.5% (CHIKV); there were no valid cases of JEV. Dengue represented the greatest burden of arboviral infections with 2.2 cases per 100,000 military healthcare enrollees over the 2012–2019 fiscal years. More than 80% of subjects with arboviral infection did not have documented pretravel counseling. Arboviral infections represent a significant disease burden in young travelers to endemic regions. After adjustment for diagnostic validity, DNV represented the greatest burden. Diagnostic codes for ZIKV and JEV overestimate the burden of these diseases. Low rates of pretravel visits represent an opportunity for increased emphasis on insect exposure precautions.

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Author Notes

Address correspondence to Trevor Wellington, Walter Reed Army Institute of Research, 503 Robert Grant Ave., Silver Spring, MD. E-mail: wellington.trevor@gmail.com

Disclosure: The contents of this publication are the sole responsibility of the author(s) and do not necessarily reflect the views, opinions or policies of Uniformed Services University of the Health Sciences, Walter Reed Army Institute of Research, the 1st Area Medical Laboratory, the Department of Defense, the Departments of the Army or Air Force, Brooke Army Medical Center, the Defense Health Agency, the U.S. Army Medical Department, the U.S. Army Office of the Surgeon General, or the Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Mention of trade names, commercial products, or organizations does not imply endorsement by the U.S. Government. The investigators have adhered to the policies for protection of human subjects as prescribed in 45 CFR 46.

Disclaimer: This work was previously presented as a poster at IDWeek 2020 (virtual) and a podium presentation at Triservice ACP 2020 (virtual).

Authors’ addresses: Trevor Wellington, Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, MD, Clinical Trials Center, Walter Reed Army Institute of Research, Silver Spring, MD, and 1st Area Medical Laboratory, Aberdeen Proving Grounds, MD, E-mail: wellington.trevor@gmail.com. Jamie A. Fraser and Huai-Ching Kuo, Infectious Disease Clinical Research Program, Department of Preventive Medicine and Biostatistics, Uniformed Services University of Health Sciences, Bethesda, MD, and Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, E-mails: jamiefras@gmail.com and ckuo@idcrp.org. Patrick W. Hickey, Department of Pediatrics, Uniformed Services University of Health Sciences, Bethesda, MD, E-mail: patrick.hickey@usuhs.edu. David A. Lindholm, Department of Medicine, Uniformed Services University of Health Sciences, Bethesda, MD, and Infectious Disease Service, Department of Medicine, Brooke Army Medical Center, Fort Sam Houston, TX, E-mail: david.lindholm@usuhs.edu.

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