sorry if this isn’t biology. not sure.
why do some get huge flea infestations from coming into contact with animals with fleas while others have pets with fleas that pretty much seem to stick to the animals?
i live with cats and a dog that get fleas. i give them flea baths/treatments and use flea home sprays to keep it under control, but they always come back in some capacity. the dog unfortunately has to deal with them more than the cats — she’s not my responsibility, but her owner neglects her so i do what i can to tame the fleas when i have the time.
anyway, the thing is that i never see fleas just hopping around on my couch, or mingling in my bed sheets, or bouncing about in the carpet. i definitely never see them on my own body, let alone get bitten by them. the only time they’ll leave my cats is if i happen to see one in the perfect positioning for me to kill and it ends up literally slipping through my fingers. or, if i’m spraying my cats down in flea spray, sometimes one or two will pop away from their wet bellies. or, when i’m bathing them, there might be a couple on my clothes when i’m done. whatever the case, the fleas never multiply and take over my house, my bed, or my body.
on the other hand, i heard a woman talking about a friend that gave her fleas the other day. the friend brought her dog into the woman’s apartment, it scratched its ears a lot and scooted its butt on a rug, and voila, a million fleas jumping jumping when the friend left. they ate her up in the middle of the night and had even taken over her baby in her cradle, who was screaming and slapping herself madly. interestingly, her boyfriend, who slept in the same bed as her, was unaffected by the fleas.
they left, and before entering the hotel room they would stay in temporarily, they meticulously treated themselves, the car, and the apartment. the next night in the hotel, the woman woke up to a live flea on her pillow. it took her a while to finally become flea-free.
so why is it that some can live with flea-having animals just fine, but others get horrible infestations? are there, like, different bloodlines of fleas or something? do i need to worry about my animals’ fleas suddenly starting to fiend for human blood?
edit: the woman who got the flea infestation and i live in the same city. don’t know if that matters.
In: Biology
IME, flea infestations happen when the pet doesn’t live in the home. IE the flea ridden pet was there and brought in the fleas, but then left. Fleas are then left without a host, so they bite humans. When you have a untreated pet, the fleas just eat the pet and you really don’t notice them that much, except for the occasional scratching. Also, eggs can stay dormant for a very long time, so it is hard to get rid of them once you have them. Fleas don’t really like humans so if they have another option as a host they will rarely affect a human, unless like you described where one happened to get knocked off the pet right where you were watching.
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