UNIVERSITY PARK, Pa. - A new study has looked into how COVID-19 cases are spreading among the white-tailed deer population — leaving some scientists to wonder if the virus could jump back to humans.A group of veterinarians at Penn State published the study, although it has yet to be peer-reviewed."Many animal species are susceptible to SARS-CoV-2 and could potentially act as reservoirs, yet transmission in non-human free-living animals has not been documented," the study’s authors noted. RELATED: 3 snow leopards die from COVID-19 complications at Nebraska zooResearchers looked into deer-to-deer coronavirus transmission.