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=Introduction=
=Morphology=
*Very small RNA viruses
*Much antigenic variation
*Subtypes evolve and do not cross-protect
*4 capsid proteins (VP1-VP4), with VP1 providing neutralizing target
=Virulence and Pathogenesis=
*Cytopathic effect of all viruses is an overnight '''cell rounding''' and '''pyknosis'''
=Epidemiology=
*Very resistant
*Can survive several months on '''fomites'''
*Infect via upper respiratory tract or buccal cavity and spread to target organs after viremia
=Types and Subtypes=
3 Main Genera:
===Enteroviruses===
*[[Swine Vesicular Disease]]
*[[Porcine Enterovirus]]
===Apthoviruses===
*[[Foot and Mouth Disease (FMDV)]]
===Rhinoviruses===
*Subclinical cold viruses
*Equine rhinovirus (picornavirus type 1 and 2) in [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|rhinitis]], see [[Respiratory Viral Infections - Pathology#Equine rhinovirus|respiratory infections]]
*Equine rhinovirus (picornavirus type 1 and 2) in [[Nasal Cavity Inflammatory - Pathology#Infectious causes of rhinitis|rhinitis]], see [[Respiratory Viral Infections - Pathology#Equine rhinovirus|respiratory infections]]
*Bovine rhinovirus may cause mild [[Respiratory Viral Infections - Pathology#Bovine rhinovirus|respiratory infections]]
*Bovine rhinovirus may cause mild [[Respiratory Viral Infections - Pathology#Bovine rhinovirus|respiratory infections]]
*[[Cavity & Gingiva - Pathology#Swine Vesicular Disease|Swine Vesicular Disease Virus]]
*[[Cavity & Gingiva - Pathology#Swine Vesicular Disease|Swine Vesicular Disease Virus]]
**May cause [[Viral skin infections - Pathology#Other viruses|skin lesions]]
**May cause [[Viral skin infections - Pathology#Other viruses|skin lesions]]