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Head lice and their eggs soon perish if separated from their human host. Detached lice survive just a day or so, and the eggs generally lose viability within a week. The chances of a live head louse or egg becoming reunited with a person would seem exceptionally remote. Accordingly, herculean steps to clean lice from the house or car by intensive washing or vacuuming will result in a cleaner space, but are unlikely to facilitate the goal of eliminating the lice from those residing in the home. A child’s car seat cover may benefit from vacuuming, as a few errant lice or eggs may temporarily lodge there and survive for a day or so.

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