Despite the progress achieved since 1988, as long as a single child remains infected with poliovirus, children in all countries are at risk of contracting the disease.

• 尽管自1988年取得了进展,但只要有一名儿童仍然受到脊髓灰质炎病毒的感染,所有国家的儿童就都有感染该病的危险。