但是，在1960至1980年期间，源自阿富汗的输入性疟疾曾出现过上升趋势。
However in the 1960-1980 period, there was an increasing trend in imported malaria originating in Afghanistan.
从寄生虫学、昆虫学和社会因素的调查结果表明，输入性疟疾是引起本次暴发流行的传染来源。
The results of investigation on parasitology, entomology and social factors showed that imported malaria is the infection source of the outbreak.
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