I live in Texas. I have an indoor cat who is 14 years old. Somehow we got fleas. But I am 99.9% sure of the fleas have been eradicated. I've not seen a flea or caught one in the traps in the house for months.
My cat is regularly treated with advantage from the vet and I thoroughly sprayed and bombed two times and got rid of them.
And yet I'm still noticing that's it on my body from time to time and it's usually after I pet my cat. If I pet the cat, I'll notice by its on my hand or arm, etc.
I don't understand what it could be that is biting me. He's not really digging or scratching very much.