Why infest the loved ones – inherent human behaviour indicates former mutualism with head lice

@article{Rzsa2012WhyIT,
  title={Why infest the loved ones – inherent human behaviour indicates former mutualism with head lice},
  author={Lajos R{\'o}zsa and P{\'e}ter Apari},
  journal={Parasitology},
  year={2012},
  volume={139},
  pages={696 - 700}
}
SUMMARY 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… 
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