More information about head lice
The nymph (juvenile louse) then develops into an adult over a 10-day period and lives as an adult for at most three weeks. From hatching to death is therefore approximately 30 to 40 days. The louse feeds on blood, piercing the skin of the scalp to gain this.
Once removed from the head and warmth from the scalp and a source of food, the louse die in 1 or 2 days. Eggs, once removed, also die if early in the gestation period. If later, they may still hatch after removal but then the nymph is not likely to survive without food.
Leaving just one egg after treatment will lead to reinfestation.
Girls are two to four times more frequently infested than boys due to their usually having longer hair. . Children between 4 and 14 years of age are the most frequently infested group. It is far less common for adults to become infested, unless passed on by their children.
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