Athletes at Rio Olympics to compete in 'basically raw sewage', study reveals

• Analysis of Rio waters reveals dangerous contamination levels
• Marine biologist: 'What you have there is basically raw sewage'
• None of three Olympic water venues tested were deemed safe

Athletes in next year's Summer Olympics will be swimming and boating in waters so contaminated with human feces that they risk becoming violently ill and unable to compete in the games, an Associated Press investigation has found.

An AP analysis of water quality revealed dangerously high levels of viruses and bacteria from human sewage in Olympic and Paralympic venues - results that alarmed international experts and dismayed competitors training in Rio, some of whom have already fallen ill with fevers, vomiting and diarrhea.