Discussion on answer by Beo: Overly friendly stray cat wants to come in our house

FYI cat fleas DO BITE HUMANS, first hand experience here, our cat went outside, got fleas, infected our carpet, and we were getting fleas for MONTHS. Our skin is not "more tough" than cat skin, they can bite through draw blood. It is true that fleas just aren't evolutionary fit to LIVE off of humans (its fairly easy to detect and fleas with sparsely hairy legs) they bite, but they can't lay eggs on human hair (not dense enough) and because they are so easy to find, one only needs to grab it, and crush it w/ finger nails to kill it.