Epidemiology in China 1. Monitoring system: incomplete 2. Main cause of death in children younger than the aged 5 3. Local epidemic data: fatality rate 26. 1% Incidence: 24.1 Secondary physical defect 1.64% Permanent crippling sequelae 1.01%Epidemiology in China 1. Monitoring system: incomplete 2. Main cause of death in children younger than the aged 5 3. Local epidemic data: fatality rate 26.1％ Incidence: 24.1% Secondary physical defect 1.64% Permanent crippling sequelae 1.01%