The saver way is...
1) Shave all publc hair and discard all underwears that you have worn since you visit 141,
2) See doctor if you get crab louse,
3) Pharmacy should have special shampoo "Lindane shampoo (1%)" to cure crab louse.
If you are shy, you can try to skip 2) and just do 1) and 3).
Wikipedia reference:
http://en.wikipedia.org/wiki/Crab_lice (has Chinese translation)