FILE - In this Aug. 22, 2010, file photo, Chip Peterson swims during the men's 10k open water final at the Pan Pacific Swimming Championships in Long Beach, Calif. For Chip Peterson and Kalyn Robinson, it should have been a time to focus on their Olympic dreams. Instead, just a couple of weeks after competing at the 2007 Pan American Games in Rio de Janeiro, the American swimmers were both stricken with eerily similar illnesses. (AP Photo/Mark J. Terrill, File)