How long do head lice live when not on a human host?

Head host Human LICE live
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How long do head lice live when not on a human host?

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Lice need to be in contact with the body of a host in order to survive and grow. They are very temperature sensitive (so need to be close to a warm body) and need to frequently feed on blood. Most head lice will die within 24 hours if they are off of a host.

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