Porcine enterovirus (PEV) is a small non-enveloped RNA virus belonging to the Family Picornaviridae. Based on CPE, replication property and difference in serological response, PEV has been divided into three groups and 13 serotypes. Group I includes serotypes 1 to 7 and 11 to 13. Serotypes 8 and 9 to 10 are classified into groups II and III, respectively. Although PEV has been associated with enteric, reproductive or respiratory diseases in swine, polioencephalomyelitis in young pigs is the disease of major concern. Here we report a prolonged outbreak of 'pig polio' due to infections with a group I PEV in a Midwest swine herd.
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