在极少情况下，疫苗中的病毒可能变异成一种可导致瘫痪的类型，这就是人们所称的疫苗衍生脊髓灰质炎病毒(VDPV)。
In very rare instances, the virus in the vaccine can mutate into a form that can paralyse - this is what is known as a vaccine-derived poliovirus or VDPV.
在流行地方性脊髓灰质炎病毒的四个国家(其他两个是尼日利亚和印度)中，阿富汗和巴基斯坦最接近于根除脊髓灰质炎。
Of the four countries with endemic poliovirus - the others are Nigeria and India - Afghanistan and Pakistan are closest to eradicating polio.
4月20日，在阿曼的脊髓灰质炎网络实验室对这些病例中的4例粪便标本检测的结果显示1型野生脊髓灰质炎病毒。
On 20 April, results of testing of stool specimens of four of the cases by the polio network laboratory in Oman revealed wild poliovirus type 1.
与塔吉克斯坦接壤的乌兹别克斯坦边境地区报告了3例急性弛缓性麻痹病例；但迄今在实验室检验中并未分离出脊髓灰质炎病毒。
Three cases of acute flaccid paralysis have been reported in Uzbekistan on the Tajikistan border; poliovirus has not been isolated yet in laboratory testing.
在32个野生脊髓灰质炎病毒确诊病例中，17例不到两岁，14例年龄在2- 5岁间，1例年龄在6- 15岁间。
Of the 32 confirmed wild poliovirus cases, 17 are under the age of two years, 14 are between the ages of two and five years, and one is between the ages of six and 15 years.
在32个野生脊髓灰质炎病毒确诊病例中，17例不到两岁，14例年龄在2- 5岁间，1例年龄在6- 15岁间。
Of the 32 confirmed wild poliovirus cases, 17 are under the age of two years, 14 are between the ages of two and five years, and one is between the ages of six and 15 years.
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