"Nacra 17 class athletes from Great Britain arrive to Flamengo beach practicing one day before the sailing test event ahead of the Rio 2016 Olympic Games in Guanabara Bay in Rio de Janeiro, Brazil, Friday, Aug. 14, 2015. Bruce Gordon, the WHO's coordinator of water, sanitation, hygiene and health, said that testing for viruses ""would be advisable"" given it's known that human sewage pollution is rife in Rio's waters. (AP Photo/Leo Correa)"
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