Malaria also can be spread by people who come from an area with large numbers of malaria cases. They may show no signs of having the disease themselves. That is what Harvard University researchers discovered in Kenya.来自有大量疟疾病人地区的人也可以传播疟疾,他们自身可能没有患病迹象.这就是哈佛大学的研究人员在肯尼亚的发现.
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