Evaluation of the NS1 Rapid Test and the WHO Dengue Classification Schemes for Use as Bedside Diagnosis of Acute Dengue Fever in Adults

Shera Chaterji Program in Emerging Infectious Diseases, Duke—National University of Singapore (NUS) Graduate Medical School, Singapore; Centre for Quantitative Medicine, Duke—NUS Graduate Medical School, Singapore; Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore

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John Carson Allen Jr. Program in Emerging Infectious Diseases, Duke—National University of Singapore (NUS) Graduate Medical School, Singapore; Centre for Quantitative Medicine, Duke—NUS Graduate Medical School, Singapore; Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore

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Angelia Chow Program in Emerging Infectious Diseases, Duke—National University of Singapore (NUS) Graduate Medical School, Singapore; Centre for Quantitative Medicine, Duke—NUS Graduate Medical School, Singapore; Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore

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Yee-Sin Leo Program in Emerging Infectious Diseases, Duke—National University of Singapore (NUS) Graduate Medical School, Singapore; Centre for Quantitative Medicine, Duke—NUS Graduate Medical School, Singapore; Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore

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Eng-Eong Ooi Program in Emerging Infectious Diseases, Duke—National University of Singapore (NUS) Graduate Medical School, Singapore; Centre for Quantitative Medicine, Duke—NUS Graduate Medical School, Singapore; Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore

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Because healthcare facilities in many dengue endemic countries lack laboratory support, early dengue diagnosis must rely on either clinical recognition or a bedside diagnostic test. We evaluated the sensitivity and specificity of the 1997 and 2009 World Health Organization (WHO) dengue classification schemes and the NS1 strip test in acute sera from 154 virologically confirmed dengue patients and 200 patients with other febrile illnesses. Both WHO classification schemes had high sensitivity but lacked specificity. The NS1 strip test had high specificity, but its sensitivity was significantly lower in secondary compared with primary dengue infections. Differences in viral serotypes did not affect the performance of any of the three diagnostic approaches. Taken collectively, our findings indicate that the 1997 WHO dengue case definition can be used to exclude dengue, and the NS1 strip test can be used to confirm dengue infection, although the latter should be interpreted with caution in regions where secondary dengue infection is prevalent.

Author Notes

*Address correspondence to Eng-Eong Ooi, Program in Emerging Infectious Diseases, Duke—NUS Graduate Medical School, 8 College Road, 2 Jalan Bukit Merah, Singapore 169854. E-mail: engeong.ooi@duke-nus.edu.sg

Financial support: This study was funded by the National Medical Research Council, Singapore.

Authors' addresses: Shera Chaterji, Angelia Chow, and Eng-Eong Ooi, Program in Emerging Infectious Diseases, Duke—NUS Graduate Medical School, Singapore, E-mails: schaterji@gmail.com, angelia.chow@duke-nus.edu.sg, and engeong.ooi@duke-nus.edu.sg. John Carson Allen Jr., Centre for Quantitative Medicine, Duke–NUS Graduate Medical School, Singapore, E-mail: john.allen@duke-nus.edu.sg. Yee-Sin Leo, Communicable Diseases Centre, Tan Tock Seng Hospital, Singapore, E-mail: yee_sin_leo@ttsh.com.sg.

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