Status of the Eradication of Indigenous Wild Poliomyelitis in the People's Republic of China

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Abstract
Alarge nationwide outbreak occurred in 1989–1990 in China, in which nearly 10,000 poliomyelitis cases were reported. After two rounds of oral poliovirus vaccine (OPV) supplemental activity in nearly every province in the 1992–1993 winter season, no wild poliovirus was detected in 1993 in 22 provinces in the middle of China that contained 86% of the population. During the first national immunization days (NIDs) conducted in December 1993 and January 1994, 83 million children 0–47 months of age were immunized. In 1994, wild polioviruswas identified in only 6 of 2397 children with stool specimens tested. After a second NID in December 1994 and January 1995, no wild poliovirus was detected in 1995 despite a very high level of virus surveillance. In summary, double-round mass supplemental OPV immunizations in children 0–3 years old in two consecutive winters eliminated wild poliovirus from 23% of the world's population (1.2 billion people).

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