also the nasty things dont like being moved around, so comb .comb disturb them .and wash all bedding etc all the time .
I think our local salon is part of a chain called "Lice to Know You."
There are professional salons that specialize in lice combing. Google "salon comb lice" and you should find one. They do a really good job, and are not expensive.
If you have four other children who are in the clear, please also remember that you have to vacuum all the furniture where the child's head has touched, (including car seats), and wash all the bedding and pillows, and vacuum the mattresses, or your problem will be bigger than just one child pretty soon, sorry to say.
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