I'm not long back from the vet to buy flea treatment because our new kitties have them and I asked if they can live on humans. I was told they categorically can't. They can live for a very short time on carpets bedding etc which is why they always recommend you use the spray to spray your home but without the pet itself they can't live long.

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P.s

We're not allowed to de-flea the kittens yet either because they are too ickle. So flea drops for big mogs and house spray until at least another week.