Hoarau, A. O. G.; Craft, M. E.; Kraberger, S. J.; Geary, B.; Hoy-Petersen, J.; Ellis, J. C.; Alder, J.; Hathaway, S.; Wittemyer, G.; Bastille-Rousseau, G.; Kishimoto, T.; Anderson, T.; Gallo, T.; Mullinax, J. M.; Roess, A. A.; Forester, J. D.; Garwood, T. J.; Wolf, T. M.; Malmberg, J. L.; Roundtree, M. K.; Titcomb, G. C.; Windell, R. M.; Diuk-Wasser, M. A.; Plimpton, L. D.; VanAcker, M. C.; Baker, A.; Corondi, A. M.; Walter, W. D.; Walters, T. S.; Grove, D. M.; Kosiewska, J. R.; Metts, D. L.; Mitchell, C.; Muller, L. I.; Wilber, M. Q.; Wyrick, J. D.; Manlove, K. R.; Morrison, M.; Smith, L.; St

Over the past several decades, deer populations in North America have grown considerably, resulting in frequent contact with humans and livestock, and increased potential for pathogen spillover. Despite the importance of pathogen spillover among humans, wildlife, and livestock, the diversity of viruses present in deer remains largely unknown. Using a metagenomic high-throughput sequencing approach, we characterized viral communities in the upper respiratory tracts of live mule deer (Odocoileus hemionus) and white-tailed deer (Odocoileus virginianus) captured at fourteen study sites in nine states across the United States. We identified vertebrate-infecting viruses in both deer species at all but two of the study sites, located in Illinois and Utah. Viral richness did not vary among species or study sites. However, viral community composition was different across study sites but not among deer species. Amongst the detected viral sequences, several originate from or were closely related to viruses previously described in humans (e.g., severe acute respiratory syndrome coronavirus 2) and livestock (e.g., bovine-like coronavirus). We also documented viruses recently discovered in deer, such as CHeRI orbivirus 1. Finally, we identified several new putative viruses in the Picornaviridae, Rhabdoviridae and Tobaniviridae families, including a novel Aphthovirus related to bovine rhinitis A virus in both deer species, across seven states and nine study sites. Our findings expand the understanding of viral diversity in two deer species across the United States, providing important insights for managing pathogens at the wildlife, livestock, and human interface.