寄生虫的幼虫和成虫，其寄主不是同一个种时，则幼虫的寄主称为中间宿主或中间寄主。有些寄生虫在其发育过程中需要两种以上的不同的中间宿主，在这种情况下随着寄生虫的发育阶段的推移，前一个所寄生的动物称为第一中间宿主（first intermediatehost），后一阶段所寄生的动物称为第二中间宿主（second intermediate host）等等。
中国研究人员得出结论，猪在这次病毒基因重配中未发挥中间宿主作用。
As such, the Chinese researchers have concluded pigs are not intermediate hosts for the deadly new strain of bird flu.
马被确认是中间宿主，由于在照护或剖检病马或死马期间的密切接触，此病毒传播至人。
Horses have been identified as the intermediate hosts, transmitting infection to humans through close contact during care or necropsy of the ill or dead horses.
这种病毒之所以不同，是因为它并没有通过传染猪，使猪成为中间宿主，而是直接由鸡传染给人类。
This virus was different because it moved directly from chickens to people, rather than having been altered by infecting pigs as an intermediate host.
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