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Why infest the loved ones - Inherent human behaviour indicates former mutualism with head lice

机译:为什么要侵扰亲人-人类固有的行为表明以前与头虱共生

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摘要

Head lice transmit to new hosts when people lean their heads together. Humans frequently touch their heads to express friendship or love, while this behaviour is absent in apes. We hypothesize that this behaviour was adaptive because it enabled people to acquire head lice infestations as early as possible to provoke an immune response effective against both head lice and body lice throughout the subsequent periods of their life. This cross-immunity could provide some defence against the body-louse-borne lethal diseases like epidemic typhus, trench fever, relapsing fever and the classical plague. Thus the human 'touching heads' behaviour probably acts as an inherent and unconscious 'vaccination' against body lice to reduce the threat exposed by the pathogens they may transmit. Recently, the eradication of body-louse-borne diseases rendered the transmission of head lice a maladaptive, though still widespread, behaviour in developed societies.
机译:人们将头靠在一起时,头虱会传播到新宿主。人们经常触摸他们的头以表达友谊或爱,而猿却没有这种行为。我们假设这种行为是适应性的,因为它使人们能够尽早获得头虱感染,从而在整个生命的后期阶段激发对头虱和身体虱子有效的免疫反应。这种交叉免疫可以抵御体虱传播的致命疾病,如流行性斑疹伤寒,地沟热,复发性发热和经典瘟疫。因此,人类的“触头”行为可能充当了针对体虱的固有和无意识的“疫苗接种”,以减少它们可能传播的病原体所暴露的威胁。近来,消灭体虱传播的疾病使头虱的传播成为发达社会的一种适应不良的行为,尽管这种行为仍很普遍。

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