No Cause Found for Polio-Like Illness in California

CDC and California health officials still have found no explanation for more than 20 cases of a polio-like disease that causes paralysis, according to a CDC report. The report notes that the results of most of the tests conducted were negative, and researchers were not able to find a common link for the disease.

• "Calif. Paralysis Cases Still a Mystery" (Gever, MedPage Today, 10/3).