A country reporting zero cases over a period of 14 consecutive months is believed to have interrupted transmission.
人们认为，一个国家的零病例报告连续达到14个月就属于阻断了疾病传播。
A country reporting zero cases over a period of 14 consecutive months is believed to have interrupted transmission.
人们认为，一个国家的零病例报告连续达到14个月就属于阻断了疾病传播。
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