1. Surveillance of Vermont wildlife in 2021-2022 reveals no detected SARS-CoV-2 viral RNA.
- Author
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Despres HW, Mills MG, Schmidt MM, Gov J, Perez Y, Jindrich M, Crawford AML, Kohl WT, Rosenblatt E, Kubinski HC, Simmons BC, Nippes MC, Goldenberg AJ, Murtha KE, Nicoloro S, Harris MJ, Feeley AC, Gelinas TK, Cronin MK, Frederick RS, Thomas M, Johnson ME, Murphy J, Lenzini EB, Carr PA Jr, Berger DH, Mehta SP, Floreani CJ, Koval AC, Young AL, Fish JH, Wallace J, Chaney E, Ushay G, Ross RS, Vostal EM, Thisner MC, Gonet KE, Deane OC, Pelletiere KR, Rockafeller VC, Waterman M, Barry TW, Goering CC, Shipman SD, Shiers AC, Reilly CE, Duff AM, Madruga SL, Shirley DJ, Jerome KR, Pérez-Osorio AC, Greninger AL, Fortin N, Mosher BA, and Bruce EA
- Subjects
- Animals, Animals, Wild, RNA, Viral genetics, SARS-CoV-2 genetics, Vermont epidemiology, Foxes, COVID-19 epidemiology, Deer, Coyotes, Lynx, Otters
- Abstract
Previous studies have documented natural infections of SARS-CoV-2 in various domestic and wild animals. More recently, studies have been published noting the susceptibility of members of the Cervidae family, and infections in both wild and captive cervid populations. In this study, we investigated the presence of SARS-CoV-2 in mammalian wildlife within the state of Vermont. 739 nasal or throat samples were collected from wildlife throughout the state during the 2021 and 2022 harvest season. Data was collected from red and gray foxes (Vulpes vulples and Urocyon cineroargentus, respectively), fishers (Martes pennati), river otters (Lutra canadensis), coyotes (Canis lantrans), bobcats (Lynx rufus rufus), black bears (Ursus americanus), and white-tailed deer (Odocoileus virginianus). Samples were tested for the presence of SARS-CoV-2 via quantitative RT-qPCR using the CDC N1/N2 primer set and/or the WHO-E gene primer set. Surprisingly, we initially detected a number of N1 and/or N2 positive samples with high cycle threshold values, though after conducting environmental swabbing of the laboratory and verifying with a second independent primer set (WHO-E) and PCR without reverse transcriptase, we showed that these were false positives due to plasmid contamination from a construct expressing the N gene in the general laboratory environment. Our final results indicate that no sampled wildlife were positive for SARS-CoV-2 RNA, and highlight the importance of physically separate locations for the processing of samples for surveillance and experiments that require the use of plasmid DNA containing the target RNA sequence. These negative findings are surprising, given that most published North America studies have found SARS-CoV-2 within their deer populations. The absence of SARS-CoV-2 RNA in populations sampled here may provide insights in to the various environmental and anthropogenic factors that reduce spillover and spread in North American's wildlife populations., (© 2023. Springer Nature Limited.)
- Published
- 2023
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