I had this in a flat, our cat had been sent off to my parents while we were away on a work placement for a few weeks, when we returned for a weekend the fleas were desperate for a feed and jumping everywhere.
We used an insecticidal powder on the carpets then.
I have no idea what is was but it seemed to work. This was back in the early 1970s. Something like Malathion and I think carbaryl, nasty chemicals both.
There was no such thin as these spot on animal flea prevention measures in those days.
I do wonder what hit then next tenants after we moved out with the cat.
No one informed us - family bereavement
Should we ban them? - politicians on TV
Hard to develop relationship - family far away