Millions of Americans seek cures for these chronic autoimmune diseases WASHINGTON, May 26, 2011 /PRNewswire-USNewswire/ -- Federal investment and research into psoriasis, the nation's most prevalent autoimmune disease, affecting as many as 7.5 million Americans, and psoriatic arthritis, a related joint condition affecting up to 30 percent of people with psoriasis, received significant advances with the introduction of psoriatic disease legislation in Congress today.

To: MEDICAL EDITORS Contact: Paula Fasano of National Psoriasis Foundation, +1-800- 723-9166, ext.