尼日利亚是世界上三个脊髓灰质炎疫源地之一，可能给整个西非和中非地区带来脊髓灰质炎病毒传入的危险。
Nigeria is one of the three remaining poliovirus reservoirs in the world and poses a high risk of re-infecting polio-free areas in the entire west and central Africa.
尼日利亚是世界上三个脊髓灰质炎疫源地之一，可能给整个西非和中非地区带来脊髓灰质炎病毒传入的危险。
Nigeria is one of the three remaining poliovirus reservoirs in the world and poses a high risk of re-infecting polio-free areas in the entire west and central Africa.
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