High Quality Content by WIKIPEDIA articles! Bovine papillomavirus (BPV) is a group of DNA viruses of the family Papillomaviridae that are common in cattle. Infection causes warts (papillomas and fibropapillomas) of the skin and alimentary tract, and more rarely cancers of the alimentary tract and urinary bladder. They are also thought to cause the skin tumour equine sarcoid in horses and donkeys.