Bovine coronavirus (BCoV) is a significant cause of respiratory disease and diarrhea in calves and of winter dysentery in adult cattle. These endemic diseases result in substantial economic losses and reduced animal welfare in cattle worldwide. Inter-herd transmission can occur directly, with contact between live animals, or indirectly, via contaminated personnel and equipment. This thesis aims to elucidate transmission of BCoV via animals, contaminated personnel and equipment, and to develop methods for tracing of the virus