Can Head Lice Survive in Water? Why Showers Don't Kill or Spread Lice
Head lice (Pediculus humanus capitis) cannot survive in water. They cling tightly to hair shafts with specialized claws and die within hours off the human scalp (desiccation, starvation).
- Showering/bathing does not drown lice—they enter a state of suspended animation but revive.
- Transmission requires direct head-to-head contact; sharing hats/brushes is minor risk.
- Nits (eggs) are cemented to hair; not washed away.
Treatment: OTC permethrin/pyrethrins or prescription topicals (malathion, spinosad, ivermectin). Wet-combing with fine-tooth nit comb is essential. Treat household contacts only if live lice found.
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