加州卫生服务部的埃里·卡维斯硕士研究员，表示面向公众的健康宣传活动和媒体报道的可能是上述概率下降原因。
Researcher Erica Weis, MPH, of California's health services department, suggests that public health campaigns and media coverage of outbreaks may be responsible for the decline.
加州卫生服务部的埃里·卡维斯硕士研究员，表示面向公众的健康宣传活动和媒体报道的可能是上述概率下降原因。
Researcher Erica Weis, MPH, of California's health services department, suggests that public health campaigns and media coverage of outbreaks may be responsible for the decline.
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