Patterns of a Sylvatic Yellow Fever Virus Amplification in Southeastern Senegal, 2010

Diawo Diallo Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Amadou A. Sall Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Cheikh T. Diagne Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Oumar Faye Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Kathryn A. Hanley Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Michaela Buenemann Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Yamar Ba Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Ousmane Faye Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Scott C. Weaver Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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Mawlouth Diallo Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal; Unité des Arbovirus et Virus des Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal; Department of Biology, New Mexico State University, Las Cruces, New Mexico; Department of Geography, New Mexico State University, Las Cruces, New Mexico; Institute for Human Infections and Immunity, Center for Tropical Diseases and Department of Pathology, University of Texas Medical Branch, Galveston, Texas

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During the wet season of 2010, yellow fever virus (YFV) was detected in field-collected mosquitoes in the Kédougou region in southeastern Senegal. During this outbreak, we studied the association of the abundance of YFV-infected mosquitoes and land cover features to try and understand the dynamics of YFV transmission within the region. In total, 41,234 mosquito females were collected and tested for virus infection in 5,152 pools. YFV was detected in 67 pools; species including Aedes furcifer (52.2% of the infected pools), Ae. luteocephalus (31.3% of the infected pools), Ae. taylori (6.0% of the infected pools) and six other species (10.4% of the infected pools) captured in September (13.4%), October (70.1%), and November (16.4%). Spatially, YFV was detected from mosquitoes collected in all land cover classes but mainly, forest canopies (49.2%). Human infection is likely mediated by Ae. furcifer, the only species found infected with YFV within villages. Villages containing YFV-infected mosquitoes were significantly closer to large forests (> 2 ha) than villages in which no infected mosquitoes were detected.

Author Notes

* Address correspondence to Diawo Diallo, Unité d'Entomologie Médicale, Institut Pasteur de Dakar, 36 avenue Pasteur, boîte postale 220, Dakar, Sénégal. E-mail: diawod@yahoo.com

Financial support: This research was supported by National Institutes of Health Grant R01AI069145, National Center for Research Resources Grant 5P20RR016480-12, and National Institute of General Medical Sciences Grant 8 P20 GM103451-12 from the National Institutes of Health.

Authors' addresses: Diawo Diallo, Cheikh T. Diagne, Yamar Ba, and Mawlouth Diallo, Unité d'Entomologie Médicale, Institut Pasteur de Dakar, Dakar, Sénégal, E-mails: diawod@yahoo.com, cheikhdiagnea09z@yahoo.fr, ba@pasteur.sn, and diallo@pasteur.sn. Amadou A. Sall, Oumar Faye, and Ousmane Faye, Unité des Arbovirus et Virus de Fièvres Hémorragiques, Institut Pasteur de Dakar, Dakar, Sénégal, E-mails: asall@pasteur.sn, oumarfaye@pasteur.sn, and ofaye@pasteur.sn. Kathryn A. Hanley, Department of Biology, New Mexico State University, Las Cruces, NM, E-mail: khanley@nmsu.edu. Michaela Buenemann, Department of Geography, New Mexico State University, Las Cruces, NM, E-mail: elabuen@nmsu.edu. Scott C. Weaver, Institute for Human Infections and Immunity, Center for Tropical Diseases, and Department of Pathology, University of Texas Medical Branch, Galveston, TX, E-mail: sweaver@utmb.edu.

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