Funding for this research was provided by:
Armed Forces Health Surveillance Center- Global Emerging Infectious Surveillance and Response System (AFRIMS-GEIS)
Received: 18 February 2019
Accepted: 9 May 2019
First Online: 7 June 2019
: Material has been reviewed by the Walter Reed Army Institute of Research. There is no objection to its publication. The opinions or assertions contained herein are the private views of the author, and are not to be construed as official, or as reflecting true views of the Department of the Army or the Department of Defense. The investigators have adhered to the policies for protection of human subjects as prescribed in AR 70–25.
: The study protocol was approved by the Institutional Review Board of the Walter Reed Army Institute of Research (WRAIR IRB) and the Ethical Review Committee for Research in Human Subjects, Ministry of Public Health, Thailand. Written informed consent was obtained from each subject prior to participation.
: Not applicable.
: The authors declare that they have no competing interests.
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