These viruses are influenza D virus and canine coronavirus. Influenza D virus was first identified in 2011. In cows, influenza D virus is believed to play a role in a serious lung illness called bovine respiratory disease. Influenza viruses, in particular, are good at mutating and adapting to new hosts. Right now, knowledge about how these viruses spread, who they affect, and how severe the illnesses can be is very limited.