西尼罗病毒脑炎于1999年在美国的爆发及随后几年在北美的流行引起了极大的关注。
The outbreak of WNV encephalitis in the United States in 1999 and subsequent epidemic in North America in the following years cause great concerns.
西尼罗病毒脑炎于1999年在美国的爆发及随后几年在北美的流行引起了极大的关注。
The outbreak of WNV encephalitis in the United States in 1999 and subsequent epidemic in North America in the following years cause great concerns.
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