Dengue and West Nile Virus Transmission in Children and Adults in Coastal Kenya

David M. Vu Department of Pediatrics, Stanford University School of Medicine, Stanford, California.

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Tamara Banda Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, California.

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Crystal Y. Teng Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, California.

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Chelsea Heimbaugh Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, California.

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Eric M. Muchiri Division of Vector Borne and Neglected Tropical Diseases, Ministry of Health, Nairobi, Kenya.

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Peter L. Mungai Case Western Reserve University, Cleveland, Ohio.

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Francis M. Mutuku Emory University, Atlanta, Georgia.

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Julie Brichard Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, California.

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Ginny Gildengorin Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, California.

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Erin M. Borland Centers for Disease Control and Prevention, Fort Collins, Colorado.

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Ann M. Powers Centers for Disease Control and Prevention, Fort Collins, Colorado.

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Uriel Kitron Emory University, Atlanta, Georgia.

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Charles H. King Case Western Reserve University, Cleveland, Ohio.

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A. Desiree LaBeaud Department of Pediatrics, Stanford University School of Medicine, Stanford, California.

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Dengue virus (DENV) and West Nile virus (WNV) are important reemerging arboviruses that are under-recognized in many parts of Africa due to lack of surveillance. As a part of a study on flavivirus, alphavirus, and parasite exposure in coastal Kenya, we measured neutralizing antibody against DENV and, to evaluate assay specificity, WNV in serum samples that tested positive for serum anti-DENV IgG by enzyme-linked immunosorbent assay. Of 830 anti-DENV IgG-positive samples that were tested for neutralizing activity, 488 (58.8%) neutralized DENV and 94 (11.3%) neutralized WNV. Of children ≤ 10 years of age, 23% and 17% had serum neutralizing antibody to DENV and WNV, respectively, indicating that DENV and WNV transmission has occurred in this region within the past decade. The results suggest that ongoing DENV and WNV transmission continues on the coast of Kenya and supports a need for routine arboviral surveillance in the area to detect and respond to future outbreaks.

Author Notes

* Address correspondence to David M. Vu, Department of Pediatrics, Stanford University School of Medicine, 300 Pasteur Drive, G312, Stanford, CA 94305. E-mail: davidvu@stanford.edu

Authors' addresses: David M. Vu and A. Desiree LaBeaud, Department of Pediatrics, Stanford University School of Medicine, Stanford, CA, E-mails: davidvu@stanford.edu and dlabeaud@stanford.edu. Tamara Banda, Crystal Y. Teng, Chelsea Heimbaugh, Julie Brichard, and Ginny Gildengorin, Center for Immunobiology and Vaccine Development, Children's Hospital Oakland Research Institute, Oakland, CA, E-mails: tamabanda@gmail.com, cteng.chori@gmail.com, cheimbau@gmail.com, julie.brichard@gmail.com, and ggildengorin@mail.cho.org. Eric M. Muchiri, Division of Vector Borne and Neglected Diseases, Ministry of Public Health and Sanitation, Nairobi, Kenya, E-mail: ericmmuchiri@gmail.com. Peter L. Mungai and Charles H. King, Center for Global Health and Diseases, Case Western Reserve University School of Medicine, Cleveland, OH, E-mails: plmungai@yahoo.com and chk@case.edu. Francis M. Mutuku and Uriel Kitron, Department of Environmental Studies, Emory University, Atlanta, GA, E-mails: fmutuku73@gmail.com and ukitron@emory.edu. Erin M. Borland and Ann M. Powers, Division of Vector-borne Diseases, Centers for Disease Control and Prevention, Fort Collins, CO, E-mails: fmw2@cdc.gov and akp7@cdc.gov.

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