Humans have infected wild deer with Covid-19 in a handful of states, and there’s evidence that the coronavirus has been spreading among deer, according to recent studies that outline findings that could complicate the path out of the pandemic. 

Scientists swabbed the nostrils of white-tailed deer in Ohio and found evidence that humans had spread the coronavirus to deer at least six times, according to a study published last month in Nature. 

About one-third of the deer sampled had active or recent infections, the study says. Similar research in Iowa of tissue from roadkill and hunted deer found widespread evidence of the virus.