Epidemiological Factors Associated with Dengue Shock Syndrome and Mortality in Hospitalized Dengue Patients in Ho Chi Minh City, Vietnam

Katherine L. Anders Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Nguyen Minh Nguyet Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Nguyen Van Vinh Chau Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Nguyen Thanh Hung Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Tran Thi Thuy Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Le Bich Lien Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Jeremy Farrar Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Bridget Wills Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Tran Tinh Hien Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Cameron P. Simmons Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam; Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam; Department of Dengue Haemorrhagic Fever, Children's Hospital No. 1, Ho Chi Minh City, Vietnam; Department of Infectious Diseases, Children's Hospital No. 2, Ho Chi Minh City, Vietnam

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Understanding trends in dengue disease burden and risk factors for severe disease can inform health service allocation, clinical management, and planning for vaccines and therapeutics. Dengue admissions at three tertiary hospitals in Ho Chi Minh City, Vietnam, increased between 1996 and 2009, peaking at 22,860 in 2008. Children aged 6–10 years had highest risk of dengue shock syndrome (DSS); however, mortality was highest in younger children and decreased with increasing age (odds ratio [OR] = 0.52, 95% confidence interval [CI] = 0.36–0.75 in 6- to 10- year-old children and OR = 0.27, 95% CI = 0.16–0.44 in 11- to 15-year-old children compared with 1- to 5-year-old children). Males were overrepresented among dengue cases; however, girls had higher risk of DSS (OR = 1.19, 95% CI = 1.14–1.24) and death (OR = 1.57, 95% CI = 1.14–2.17). Young children with dengue had greatest risk of death and should be targeted in dengue vaccine and drug trials. The increased risk of severe outcomes in girls warrants further attention in studies of pathogenesis, health-seeking behavior, and clinical care.

Author Notes

*Address correspondence to Katherine L. Anders, Oxford University Clinical Research Unit, Hospital for Tropical Diseases, 190 Ben Ham Tu, District 5, Ho Chi Minh City, Vietnam. E-mail: kanders@oucru.org

Financial support: This study was supported by the Wellcome Trust.

Authors' addresses: Katherine L. Anders, Nguyen Minh Nguyet, Jeremy Farrar, Bridget Wills, Tran Tinh Hien, and Cameron P. Simmons, Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam, E-mails: kanders@oucru.org, nguyetnm@oucru.org, jfarrar@oucru.org, bwills@oucru.org, hientt@oucru.org, and csimmons@oucru.org. Nguyen Van Vinh Chau, Hospital for Tropical Diseases, Ho Chi Minh City, Vietnam, E-mail: chaunvv@oucru.org. Nguyen Thanh Hung and Le Bich Lien, Department of Dengue Haemorrhagic Fever, Children's Hospital Number 1, Ho Chi Minh City, Vietnam, E-mails: drthanhhung@gmail.com and doctorbichlien@yahoo.com. Tran Thi Thuy, Department of Infectious Diseases, Children's Hospital Number 2, Ho Chi Minh City, Vietnam, E-mail: mecudibu@yahoo.com.

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