这些寄生虫通过受感染的按蚊叮咬在人际进行传播。按蚊是疟疾病媒，主要在黄昏至拂晓期间叮咬。
The parasites are spread to people through the bites of infected Anopheles mosquitoes, called "malaria vectors", which bite mainly between dusk and dawn.
不过，感染期很短的病媒就不会采取这种策略，例如流感病毒。
This scheme contrasts with the tactics of a pathogen that has a short infectious period, such as the flu virus.
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