Flea combs may get some of the fleas but they don't kill the eggs, and they will continue hatching more fleas and these will lay more eggs. One flea can lay 40 eggs per day! Fleas can be really tough to get rid of, and unfortunately most of the store-bought products (Flea collars, shampoos, pills) won't completely destroy them. Trust me I've gone through all this myself! After trying lots of different stuff, I saw the vet and he recommended a topical treatment- called Advocate. I also used a spray for my house that kills the flea eggs. My kitty is now flea free : )
Severe flea infestations can make cats very sick, and sometimes they can even kill cats, especially kittens or older cats. Also, cats can get tapeworm from eating flea eggs, so they may need to be treated for that too.
Maybe give your vet a call and see what he says.
Good luck getting rid of those nasty fleas!
Here are some links about fleas if you're interested:http://www.catworld.co.uk/articlecat...1098&pre=25638http://www.uptonvet.com.au/Templates...&story_no=1576