Centipedes Bite!

We think our house is the local breeding ground for centipedes. We spray our kitchen every night and ususally wake up to the sight of several semi-conscious centipedes (4-6 inches long) suffering from the effects of the spray. Bob is always walking barefoot in the house (which is the custom in Thailand). He has stepped on a few dead centipedes and scorpions, but yesterday a very "live" centipede got him on the top of his big toe as he opened the refrigerator early in the morning. Oi!!!! (as they say in Thailand for "ouch"). His foot was on fire for three hours. Luckily, he reacted quickly and the swelling was minimal. Today, Bob is wearing flip-flops in the house!!!!