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A new study seeks to determine how one parasitic species can give rise to two drastically different outcomes in its host: The human body louse (Pediculus humanus) can transmit dangerous bacterial infections to humans, while the human head louse (also Pediculus humanus) does not.
Genetic evidence suggests head lice and body lice may be the same species. This finding is of particular importance because body lice have been known to transmit deadly bacterial diseases, while head lice do not.
- Sleep; the state or condition of being asleep.