Poliomyelitis 。Poliovirus Transmitted by ingestion Initial symptoms:sore throat and nausea Viremia may occur;if persistent,virus can enter the CNS;destruction of motor cells and paralysis occurs in <1%of cases Prevention is by vaccination (enhanced-inactivated polio vaccine) • Poliovirus • Transmitted by ingestion • Initial symptoms: sore throat and nausea • Viremia may occur; if persistent, virus can enter the CNS; destruction of motor cells and paralysis occurs in <1% of cases • Prevention is by vaccination (enhanced-inactivated polio vaccine) Poliomyelitis