text: FILE - In this Nov. 3, 2015 file photo, Brazilian athletes Samuel Albrecht and Isabel Swan practice in Guanabara Bay in Rio de Janeiro, Brazil. Independent testing of Guanabara Bay conducted by AP over the last year shows disease-causing viruses linked to human sewage at levels thousands of times above what would be considered alarming in the U.S. or Europe. The tests include the venue for sailing, but also Rio's Olympic venues for rowing, canoeing, open-water swimming and triathlon. (AP Photo/Felipe Dana, File