传播的疫苗衍生脊髓灰质炎病毒（cVDPV）在尼日利亚的出现，再次证明尚有不少儿童没有得到保护，使他们免遭脊髓灰质炎病毒的侵袭（无论是野生型还是疫苗衍生型）。
The spread of a circulating vaccine-derived poliovirus in Nigeria reaffirms that not enough children are protected from poliovirus (wild or vaccine-derived).
迄今为止，已在其中7例病例的诊断样本中分离出了1型脊髓灰质炎病毒。
To date, poliovirus type 1 has been isolated in diagnostic specimens from 7 of these cases.
自2007年以来，该国持续发生1型脊髓灰质炎病毒疫情。 2007年报告发生8例病例，2008年和2009年分别发生29例。
The country has had a persistent outbreak of poliovirus type 1 (WPV1) since 2007, where 8 cases were reported that year, and 29 cases each in 2008 and 2009.
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