序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
序列分析显示，病毒分为野毒和疫苗毒两簇，野毒的分型和地理位置关系密切。
Sequence analysis showed that viruses were divided into two clusters of wild-type and vaccine virus, respectively, and the wild virus had close relationship with its geographic location.
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