"Enteroviruses" are single-stranded (ss)RNA viruses which form a genus within the family of Picornaviridae; The enterovirus genus currently consists of about 111 serotypes which are grouped into 8 species: Poliovirus (3 serotypes), Human enterovirus A (12 serotypes), Human enterovirus B (36 serotypes), Human enterovirus C (11 serotypes), Human enterovirus D (2 serotypes), Bovine enterovirus (2 serotypes), Porcine enterovirus A (1 serotype) and Porcine enterovirus B (2 serotypes).