Desensitized = allergy resistant, sort of. Your body finally figures out there's no point overreacting to this clearly harmless substance.
You can't ever get desensitized to cat allergies, as the thing you are allergic to (the Guard Hairs in the fur) have a different chemical make-up in every individual cat because each cat has a different set of genes, so they're not all clones of each other...(same goes for hayfever I believe)
But - Lion ( :? what an odd name for someone with cat allergies
) if you get to a local herbal medicine store called Dr&Herbs, they'll be able to sort you out with some herbal tea. Possibly along with a course of acupuncture too, but they stress that this is by no means neccessary.
Pretty much they will ask what symptoms you get, possibly do a test on a hair/some skin of yours to see what else you're allergic to, and then give you a large bag of leaves and bark and things - looks like the sweepings of a forest floor. You'll be really really sceptical when you see it. Anyway you boil it up, sieve out the bits and drink twice a day. Tastes horrible. I used to put sugar in mine...which is a shame, considering.
But it works
one course of about three months completely cured my cat allergy And hayfever about three years ago. Try it out!