Competency of Reptiles and Amphibians for Eastern Equine Encephalitis Virus

Gregory White Global Health Infectious Disease Research Program, Department of Global Health, University of South Florida, Tampa, Florida; Department of Biological Sciences, Auburn University, Auburn, Alabama

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Christy Ottendorfer Global Health Infectious Disease Research Program, Department of Global Health, University of South Florida, Tampa, Florida; Department of Biological Sciences, Auburn University, Auburn, Alabama

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Sean Graham Global Health Infectious Disease Research Program, Department of Global Health, University of South Florida, Tampa, Florida; Department of Biological Sciences, Auburn University, Auburn, Alabama

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Thomas R. Unnasch Global Health Infectious Disease Research Program, Department of Global Health, University of South Florida, Tampa, Florida; Department of Biological Sciences, Auburn University, Auburn, Alabama

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Eastern equine encephalitis virus (EEEV) is endemic throughout most of the eastern United States. Although it is transmitted year round in Florida, transmission elsewhere is seasonal. The mechanism that enables EEEV to overwinter in seasonal foci remains obscure. In previous field studies, early season EEEV activity was detected in mosquito species that feed primarily upon ectothermic hosts, suggesting that reptiles and amphibians might represent overwintering reservoir hosts for EEEV. To determine if this might be possible, two commonly fed upon amphibian and reptile species were evaluated as hosts for the North American subtype I strain of EEEV. Neither amphibian species was a competent host. However, circulating viremias were detected in both reptile species examined. Hibernating infected garter snakes remained viremic after exiting hibernation. These data suggest that snakes may represent an overwintering host for North American EEEV.

Author Notes

*Address correspondence to Thomas R. Unnasch, Global Health Infectious Disease Research Program, Department of Global Health, College of Public Health, University of South Florida 3720 Spectrum Blvd., Suite 304 Tampa, FL 33612. E-mail: tunnasch@health.usf.edu

Financial support: This work was supported by a grant from the National Institute of Allergy and Infectious Diseases (Project # R01AI049724) to TRU.

Authors' addresses: Gregory White, Coachella Valley Mosquito and Vector Control District, Indio, CA, E-mail: gwhite@cvmvcd.org. Christy Ottendorfer Division of Select Agents and Toxins, Centers for Disease Control and Prevention, Atlanta, GA, E-mail: cottendorfer@gmail.com. Sean Graham, Department of Biological Sciences, Auburn University, Auburn, AL, E-mail: thronateeska@yahoo.com. Thomas R. Unnasch, Global Health Infectious Disease Research Program, Department of Global Health, College of Public Health, University of South Florida, Tampa, FL, E-mail: tunnasch@health.usf.edu.

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