*Superinfection will quickly '''spread horizontally''' among PI animals
*Superinfection will quickly '''spread horizontally''' among PI animals
*Invariable '''fatal'''
*Invariable '''fatal'''
−
*Characterized by '''oral and enteric erosions''', particularly overlying Peyer's patches, and ulceration of the feet
+
*Characterized by [[Cavity & Gingiva - Pathology#Bovine Viral Diarrhoea / Mucosal Disease|'''oral]] and enteric erosions''', particularly overlying Peyer's patches, and ulceration of the feet
*Animals can show anorexia, depression and/or diarrhoea for 2-5 days before death
*Animals can show anorexia, depression and/or diarrhoea for 2-5 days before death
*Vaccination can lead to '''iatrogenic''' infection in undiagnosed PI calves
*Vaccination can lead to '''iatrogenic''' infection in undiagnosed PI calves