Sphynx Cat

  The allergen responsible for a cat allergy in humans is a protein named FEL D-1

  It is commonly thought that cat hair causes an allergy to cats but this is not true although cat hair can carry the allergen. Fel d 1 is a particularly sticky protein.

  FEL D-1. can be found in cat saliva. It is also produced by the sebaceous glands

  Allergens become airborne as microscopic particles and these are breathed in by the allergy sufferer. These cat allergen particles are very small and can remain airborne for long periods of time.

  Devon and Cornish Rex have a reduced number of hairs in their coat. This provides less surface area to trap allergenic proteins from the saliva or the skin. Rexes only have an undercoat and lose only a few of very fine hairs at a time. They do not shed like other cats.

  Dander is minute flakes of skin.
 
These skin cells contain oils (sebum) which are made by the cat's sebaceous glands and aid in keeping the cat's skin and coat in good condition. These skin cell particles become airborne and can be breathed in and also will adhere to most things including carpets, curtains and furnishings. It also adheres to clothing and can be spread on people's clothing to areas where no cat exist

  Shpynx cats are almost completely hairless but they do secrete the FEL D 1 protein.

  There appears to be a sex difference in Fel d 1 allergen production. Female cats produce less of the allergen. Male cats which have not been neutered tend to secrete more of the protein than un-neutered male cats.   (Reference)

It appears that different cat breeds have different levels of the FEL D 1 protein.

It is believed that the  Siberian Cat produces less allergens than other breeds. The average cat produces 63,000 micrograms of Fel-Dh1, it is estimated that the female Siberian produces approximately 200 micrograms of Fel-Dh1 per gram.