(Original post by 8EnglishRoses)
You catch them through close contact with someone carrying them already, they can jump between heads, lay their eggs and then their eggs hatch, you then pass them on to someone else etc etc. That's why there are often outbreaks in primary schools!
But can headlice breathe underwater? Because if they can't then surely you can just immerse your scalp in water (e.g. when you're lying in the bath) and they would all drown.
Hope you don't mind me pointing this out:
This is a comment on the above post, though I to would like to know where they actually come from.......where do the start>
It is a common misconception, unlike fleas, fortunately head lice DO NOT JUMP.......they do not possess the ability or the brains.
Unfortunately they do spread easily through close/direct contact with the host........explains why at times they are rife in schools, children regularly sit very close to one another, often having head to head contact.
Head lice are more common in girls than boys, the reason for this is considered to be because girl often have longer hair and if its lose, the lice can easy transfer from head to head and they CAN MOVE RAPIDLY!. Then of course you get the odd family who don't properly prevent the infestation, resulting in party time for the lice!
Adults are sometime transfered onto non humans, things like hats, bedding, towels etc, where they can survive for sometime before another suitable host comes close. UUUGGHHHHHH.
If they do drown, the likelihood is that they've laid that many eggs that within a few days these will have hatched and the new lot would be munching away at your head again.
When the lice lay eggs they're attached to the hair shaft with a special kind of glue, which is is produced in a line along the hair.............which keeps the egg attached like no bodies business.