Wild poliovirus in China
WPV update 5
21 DECEMBER 2011 - The Regional Commission for the Certification of Poliomyelitis Eradication in the Western Pacific Region (RCC) at its 17th meeting 14-19 November 2011 in Ha Noi, Viet Nam commended China for the strong leadership and extensive and prompt efforts expended in investigation and response to the polio outbreak and for inviting involvement of WHO staff from all levels in these activities. Based on the data presented at the meeting, the RCC concluded that despite the vigorous and extensive response activities it was too early to determine if the outbreak was coming under control. The RCC noted that silent transmission remains possible and consideration for interruption requires at least 6 months of sensitive surveillance after the most recently confirmed case. For the RCC to consider that the Region has retained its polio-free status, 12 months must elapse following the most recent polio case or wild poliovirus isolate, thus including the high transmission season of 2012, with surveillance indicators meeting all sensitivity criteria.
As of 21 December 2011 China has reported a total of 21 polio cases (13 from Hotan Prefecture, 6 from Kashgar Prefecture, 1 from Aksu Prefecture and 1 from Bazhou Prefecture). The latest polio case had onset on 9 October 2011. Ten cases are in children under three years of age and 11 cases are in adults (19-53 years old). Two of the polio cases have died.