近年来，有文件记载，从西非几个国家回国的旅行者感染了登革热，尤其是3型登革热病毒。
In the recent years, dengue has been documented in travellers returning from several countries in West Africa, and particularly dengue type-3 virus.
2008年，尼日利亚北部野生1型脊髓灰质炎病毒暴发，蔓延至西非邻近国家。
In 2008, northern Nigeria is experiencing an outbreak of wild poliovirus type 1, which has spread internationally into nearby countries in west Africa.
目前的重中之重就是在西非的野生1型脊灰病毒人群免疫仍维持在较高水平时，紧急阻止野生3型脊灰病毒的暴发流行。
The overriding priority is to urgently stop the WPV3 outbreak, while maintaining high population immunity across west Africa to WPV1.
目前的重中之重就是在西非的野生1型脊灰病毒人群免疫仍维持在较高水平时，紧急阻止野生3型脊灰病毒的暴发流行。
The overriding priority is to urgently stop the WPV3 outbreak, while maintaining high population immunity across west Africa to WPV1.
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