The fast-spreading Zika virus, which is believed to cause birth defects, has already reached 21 countries in Central and South America, the World Health Organisation warned yesterday.
世界卫生组织(WHO)昨日警告称，据信导致出生缺陷的寨卡病毒（Zika virus，又译兹卡病毒）快速传播，已波及中美洲和南美洲21个国家。
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