The following links tell the Lice Story quite well ...
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Conventional belief has been that head lice do not transmit disease.
That belief may be changing. The following is copied from the NPA link at top of this page:
"Do head lice carry or transmit disease?
"While many have thought head lice to be only a nuisance, recent scientific study refutes this notion. DNA technology shows head lice to be the same species as the notorious body louse which has long been associated with diseases such as typhus and relapsing fever. The potential for disease transmission via the head louse should not be underestimated"
Whether or not further research will verify this disease-carrying possibility, infections CAN occur when scratching creates open spots in the skin. Read about new research on Lice In the News. ___
Speaking of 'other types of lice' ...
the ONLY lice we deal with are HEAD lice.
And I MEAN that!
~ Michelle's mentor,
Ms. Ima Grouch
Even grandmas & aunts & great aunts can have head lice after hugs. 
... and so can grandpas & uncles & great uncles ...!
Who would have thought of that?