Number of A/H1N1 influenza viruses sampled per locality, per clade (Figure 1).
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Localities are listed in order of population size (*per 1,000 persons) and categorized as major cities (population of >1 million), mid-sized cities (population size of 100,000�C999,999), or minor cities/towns (population of
创建时间：
2015-12-02
