BVD

Mucosal disease is a severe, sometimes fatal, form of bovine viral diarrhoea virus (BVDV). The form of BVDV that causes persistent infection in calves is the non-cytopathic form, which causes less cellular destruction and pathology to the animal. The immunity of persistently infected animals is lowered, and if the animal becomes concurrently infected with the cytopathic form of the virus then mucosal disease may result. Mucosal disease usually affects animals aged 6-18 months, and is usually rapid in onset although chronic debilitating forms can occur.