Lice: If by infested you mean catch it from someone else - when the adult lice move to your head you may not feel any symptoms. As they start to hatch new ones you may notice many more and have more symptoms. This typically happens 6-12 days after exposure. Life cycle of a louse is 9-15 days. This is also why treatment should happen twice to get two life cycles.
Answered 7/13/2013
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