Stopping wild poliovirus transmission in endemic countries: Polio today is more geographically restricted than ever before.
阻断流行国家中野生脊灰病毒的传播：脊髓灰质炎如今在地域上受到的限制比以往任何时候都更大。
Stopping wild poliovirus transmission in endemic countries: Polio today is more geographically restricted than ever before.
阻断流行国家中野生脊灰病毒的传播：脊髓灰质炎如今在地域上受到的限制比以往任何时候都更大。
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