+Outcomes of<unk> virus infection in children Outcome Proportion of cases No symptoms 72% Minor illness 24% Nonparalytic aseptic meningitis 1–5% Paralytic<unk> myelitis 0.1–0.5% — Spinal<unk>  79% of paralytic cases — Bulbospinal<unk>  19% of paralytic cases — Bulbar<unk>  2% of paralytic cases The term<unk> myelitis" is used to identify the disease caused by any of the three serotypes of<unk> virus. Two basic patterns of<unk>  infection are described: a minor illness which does not involve the central nervous system (CNS), sometimes called abortive<unk> myelitis, and a major illness involving the CNS, which may be paralytic or nonparalytic. In most people with a normal immune system, a<unk> virus infection is asymptomatic. Rarely, the infection produces minor symptoms; these may include upper respiratory tract infection (sore throat and fever), gastrointestinal disturbances (nausea, vomiting, abdominal pain, constipation or, rarely, diarrhea), and influenza-like illness. The virus enters the central nervous system in about 1 percent of infections. Most patients with CNS involvement develop nonparalytic aseptic meningitis, with symptoms of headache, neck, back, abdominal and extremity pain, fever, vomiting, lethargy, and irritability. About one to five in 1000 cases progress to paralytic disease, in which the muscles become weak, floppy and poorly controlled, and, finally, completely paralyzed; this condition is known as acute flaccid paralysis. Depending on the site of paralysis, paralytic<unk> myelitis is classified as spinal, bulbar, or bulbospinal. Encephalitis, an infection of the brain tissue itself, can occur in rare cases, and is usually restricted to infants. It is characterized by confusion, changes in mental status, headaches, fever, and, less commonly, seizures and spastic paralysis.
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