Worst thing is there's never guarantee that they've taken them all out. Like trichinella spiralis - the parasite whose eggs develop in the muscle tissue of the animal/human between the fibers and they basically have to cut your muscles to small pieces and search for them and even then they might leave a few behind.

Ugh! Like normal fleas weren't bad enough. I hate these things. I get them once a year or so when I go hiking or if I have to go to the basement of the building. We spray against them regularly but we just can't get rid of these nasty creatures.