Dr. William J. Rea of the Environmental Health Center - Dallas, et al performed a study of 17 post polio patients. Polio history, with symptom and sign scores, was done on each patient. Each patient was evaluated for the effects of pollutants upon their signs and symptoms. In so doing triggering agents were discovered. The effects of pollutants and environmental antigens were studied in a controlled environmental unit. Testing was performed using cutaneous, oral, and inhaled challenges of incitants in air, food, and water. Sign and symptom scores were done periodically, and this was continued at home. The patients were followed for a period of one year to define and confirm the triggering agents and degrees of improvement.
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http://www.ehcd.com/post-polio-syndrome/