Dengue Associated Acute Encephalitis Syndrome Cases in Son La Province, Vietnam in 2014

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  • Ngwe Tun Mya Myat
    Department of Virology, Institute of Tropical Medicine, Nagasaki University
  • V. Muthugala Rohitha
    Department of Virology, Institute of Tropical Medicine, Nagasaki University
  • Thi Thu Thuy Nguyen
    Department of Virology, National Institute of Hygiene and Epidemiology
  • Hoai Linh Ly Pham
    NIHE-Nagasaki Friendship Laboratory, Nagasaki University
  • Thi Hien Thu Le
    Department of Virology, National Institute of Hygiene and Epidemiology
  • Thi Dinh Dang
    Department of Virology, National Institute of Hygiene and Epidemiology
  • Viet Hoang Nguyen
    Department of Virology, National Institute of Hygiene and Epidemiology
  • Thi Quynh Mai Le
    Department of Virology, National Institute of Hygiene and Epidemiology
  • Moi Meng Ling
    Department of Virology, Institute of Tropical Medicine, Nagasaki University
  • C. Buerano Corazon
    Department of Virology, Institute of Tropical Medicine, Nagasaki University
  • Morita Kouichi
    Department of Virology, Institute of Tropical Medicine, Nagasaki University
  • Hasebe Futoshi
    Department of Virology, Institute of Tropical Medicine, Nagasaki University Center for International Collaborative Research, Nagasaki University

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<p>Acute encephalitis syndrome (AES) is associated with high morbidity and mortality, and affects both children and adults. The main etiologic agent is Japanese encephalitis virus (JEV); however, there are also reports of Dengue virus (DENV) encephalitis. The objectives of this study were to determine the proportion of patients with encephalitis due to JEV during the 2014 outbreak in Son La Province in Vietnam and to explore the association of DENV in non-JEV viral encephalitis cases. Of 90 patients, 6 (6.7%) were positive for anti-JEV immunoglobulin M (IgM), 5 (5.6%) were positive for anti-DENV IgM, 30 (33.3%) were positive for both anti-JEV and anti-DENV IgM, and 56 (62.2%) were positive for flavivirus immunoglobulin G (IgG). In 5 patients with AES, who had positive anti-DENV IgM results in at least one of the paired serum samples, DENV was confirmed by neutralization testing. The incidence of JEV infection was high. There is still a need to maintain and strengthen the national JEV immunization program. This noticeable occurrence of DENV infection was not reported in Son La Province in 2013–2014. Our data suggested that in addition to JEV, DENV was also a causative agent of AES in 2014 in Son La Province, and this finding also confirmed the local occurrence of DENV infection.</p>

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