Horizontal and Vertical Transmission of West Nile Virus Genotype NY99 by Culex salinarius and Genotypes NY99 and WN02 by Culex tarsalis

John F. Anderson Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, Connecticut; Biology Department, American University in Cairo, Egypt; Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut; Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut

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Andy J. Main Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, Connecticut; Biology Department, American University in Cairo, Egypt; Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut; Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut

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Gong Cheng Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, Connecticut; Biology Department, American University in Cairo, Egypt; Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut; Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut

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Francis J. Ferrandino Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, Connecticut; Biology Department, American University in Cairo, Egypt; Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut; Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut

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Erol Fikrig Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, Connecticut; Biology Department, American University in Cairo, Egypt; Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut; Department of Plant Pathology and Ecology, The Connecticut Agricultural Experiment Station, New Haven, Connecticut

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Culex tarsalis is a superior horizontal and vertical vector of West Nile virus (WNV) compared with Culex salinarius. Culex salinarius transmitted WNV genotype NY99 (CT 2741-99 strain) horizontally to suckling mice at significantly lower rates than Cx. tarsalis on Days 8, 9, 10, and 12 post-infection, and Cx. salinarius transmitted WNV genotype NY99 to offspring at a lower vertical transmission infection rate than Cx. tarsalis. Culex tarsalis transmitted WNV genotypes NY99 and WN02 (CT S0084-08 strain) with equal efficiency. Daily percent horizontal transmission of genotype NY99 by Cx. tarsalis-infected per os and by intra-thoracic infection was not significantly different from daily transmission of genotype WN02 from Days 5–23 and Days 2–9 post-infection, respectively. Our findings do not support the previously published hypothesis that genotype NY99 was replaced in the New World by WN02 because of a shorter extrinsic incubation of WN02.

Author Notes

*Address correspondence to John F. Anderson, The Connecticut Agricultural Experiment Station, PO Box 1106, New Haven, CT 06504. E-mail: john.f.anderson@ct.gov

Financial support: The research was supported in part by USDA Specific cooperative agreement 58-6615-1-218 and by Laboratory Capacity for Infectious Diseases cooperative agreement U50/CCU116806-01-1 from the Centers for Disease Control and Prevention.

Authors' addresses: John F. Anderson, Department of Entomology and Center for Vector Biology and Zoonotic Diseases, The Connecticut Agricultural Experiment Station, New Haven, CT, E-mail: John.F.Anderson@ct.gov. Andy J. Main, Department of Biology, American University in Cairo, Cairo, Egypt, E-mail: andymain@aucegypt.edu. Gong Cheng, Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, E-mail: chenggong2006@gmail.com. Francis J. Ferrandino, Department of Plant Pathology, The Connecticut Agricultural Experiment Station, New Haven, CT, E-mail: Francis.Ferrandino@ct.gov. Erol Fikrig, Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, E-mail: erol.fikrig@yale.edu; Erol Fikrig is an Investigator with the Howard Hughes Medical Institute, The Connecticut Agricultural Experiment Station, New Haven, CT.

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