Don't know much about them but is there a spray anyone could take with them to protect you?
When you walk by a room that they are redoing with a new matress then chances are that is why!
I've heard that heat it the best thing to kill them.
They have become immune to sprays, they have made such a comeback they are now going off to college.
we were close to eradicating them but since we've banned DDT (I almost typed in ddp.) they've made a soaring come back.