Hi doctors,is cat allergy caused by cat hair,or something else? thank you.

Not hair, dander: Cat allergies are due to the proteins in skin and saliva. The cat licks its fur and the protein ends up on the hair. So yes, cat-spit coated hair can cause allergy symptoms. Also oil glands on the skin produce proteins too..The proteins are what cause the allergic reaction. See this page: http://www.asthmacenter.com/index.php/news/details/pet_allergy/