Sharon ~ I've lost the link to the site where I found the following --- been doing ALOT of research and evidently went crazy copying and pasting without thought of saving sources.

Is PKD Only a Problem for Persian Breeders?

No. Although PKD appears to be more prevalent among Persians (including Himalayans) and Exotics, ultrasound results to date have also found PKD in American Curls, American Shorthairs, Siamese and Scottish Folds, as well as Household Pets, Domestic Shorthairs, and Feral cats. An Oriental Shorthair was also diagnosed with PKD as the result of a necropsy.

Test results from many breeds are not available, and even for those which are available, most are so few in number as to be inconclusive what the eventual results will be. However, about 7% of the 172 non-Persian and non-Exotic cats tested to date have been positive, vs. about 37% of the Persians and Exotics.