In addition to international spread of type 1 polio, wild poliovirustype3 originating from northern Nigeria has also been reported in Chad and Niger.
除了在国际范围蔓延的1型脊髓灰质炎外,乍得和尼日尔也报告了起源于尼日利亚北部的3型脊髓灰质炎病毒。
2
Pakistan is affected by nationwide transmission of WPV1, and is the location of the only wild poliovirustype3 (WPV3) case in Asia in 2011 (a strain on the verge of elimination on the continent).