Experimental Infection of Eastern Gray Squirrels (Sciurus carolinensis) with West Nile Virus

Andrés Gómez Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Laura D. Kramer Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Alan P. Dupuis II Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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A. Marm Kilpatrick Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Lauren J. Davis Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Matthew J. Jones Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Peter Daszak Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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A. Alonso Aguirre Columbia University, New York, New York; Wadsworth Center, New York State Department of Health, Albany, New York; The Consortium for Conservation Medicine, New York, New York; Department of Ecology and Evolutionary Biology, University of California, Santa Cruz, California; Wildlife Trust, New York, New York

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Eastern gray squirrels (Sciurus carolinensis) have shown high West Nile virus (WNV) seroprevalence, and WNV infection has been suggested as a cause of morbidity and mortality in this species. We experimentally infected nine eastern gray squirrels with WNV to determine the clinical effects of infection and to assess their potential role as amplifying hosts. We observed no morbidity or mortality attributable to WNV infection, but lesions were apparent in several organs. We detected mean viremias of 105.1 and 104.8 plaque-forming units (PFU)/mL on days 3 and 4 post-infection (DPI) and estimated that ~2.1% of Culex pipiens feeding on squirrels during 1–5 DPI would become infectious. Thus, S. carolinensis are unlikely to be important amplifying hosts and may instead dampen the intensity of transmission in most host communities. The low viremias and lack of mortality observed in S. carolinensis suggest that they may be useful as sentinels of spillover from the enzootic amplification cycle.

Author Notes

Reprint requests: Andrés Gómez, Department of Ecology, Evolution and Environmental Biology, Columbia University, 1200 Amsterdam Avenue, MC 5557, New York, NY 10027, Tel: 212-854-9987, E-mail: ag2112@caa.columbia.edu.
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