Seventeen U.S. rowers fall ill in Rio at test event for 2016 Olympics amid concern about polluted water that tested positive for 'human sewage'

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http://www.dailymail.co.uk/news/article-3192169/Monday-August-10-2015.html

The poorly Americans - 13 teenage athletes and four staffers - were part of a 40-member team for an event at Rodrigo de Freitas Lake
U.S. team doctor said of the stomach illnesses: 'I think it's from the lake'
U.S. coach Susan Francia, a two-time Olympic gold-medal rower, was among those who got sick
She warned Olympic athletes: 'You should know when you're coming next year that you have to be smart about how you are preparing'
Water quality has been found to be questionable in 'all of Rio's Olympic and Paralympic water venues'