Two Cases of False-Positive Dengue Non-Structural Protein 1 (NS1) Antigen in Patients with Hematological Malignancies and a Review of the Literature on the Use of NS1 for the Detection of Dengue Infection

Shimin J. Chung Department of Infectious Diseases, Singapore General Hospital, Singapore; Department of Laboratory Medicine, Tan Tock Seng Hospital, Singapore; National Public Health Laboratory, Ministry of Health, Singapore; Communicable Diseases Centre, Institute of Infectious Diseases and Epidemiology, Tan Tock Seng Hospital, Singapore; Yong Loo Lin School of Medicine, National University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore

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Prabha U. Krishnan Department of Infectious Diseases, Singapore General Hospital, Singapore; Department of Laboratory Medicine, Tan Tock Seng Hospital, Singapore; National Public Health Laboratory, Ministry of Health, Singapore; Communicable Diseases Centre, Institute of Infectious Diseases and Epidemiology, Tan Tock Seng Hospital, Singapore; Yong Loo Lin School of Medicine, National University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore

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Yee Sin Leo Department of Infectious Diseases, Singapore General Hospital, Singapore; Department of Laboratory Medicine, Tan Tock Seng Hospital, Singapore; National Public Health Laboratory, Ministry of Health, Singapore; Communicable Diseases Centre, Institute of Infectious Diseases and Epidemiology, Tan Tock Seng Hospital, Singapore; Yong Loo Lin School of Medicine, National University, Singapore; Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore

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Early diagnosis of dengue has been made easier in recent years owing to the advancement in diagnostic technologies. The rapid non-structural protein 1 (NS1) test strip is widely used in many developed and developing regions at risk of dengue. Despite the relatively high specificity of this test, we recently encountered two cases of false-positive dengue NS1 antigen in patients with underlying hematological malignancies. We reviewed the literature for causes of false-positive dengue NS1.

Author Notes

* Address correspondence to Shimin J. Chung, The Academia, Singapore General Hospital, Department of Laboratory Medicine, Tan Tock Seng Hospital and Communicable Disease Centre, 20 College Road, Singapore 169856. E-mail: jasmine.chung.s.m@sgh.com.sg

Authors' addresses: Shimin J. Chung, Prabha U. Krishnan, and Yee Sin Leo, The Academia, Singapore General Hospital, Department of Laboratory Medicine, Tan Tock Seng Hospital and Communicable Disease Centre, Singapore, E-mails: jasmine.chung.s.m@sgh.com.sg, prabha_krishnan@ttsh.com.sg, and yee_sin_leo@ttsh.com.sg.

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