The governing body of world says sailing it will start doing its own independent testing for viruses in Rio's Olympic waters after an Associated Press investigation showed a serious health risk to athletes competing in venues rife with raw sewage.

Peter Sowrey, the chief executive of the governing body ISAF, said he wants to know what's in the water "from a virus perspective as well as a bacteria perspective."

He says the AP investigation of water pollution in the Olympic city helped "wake us up again and put this back on the agenda."

The sailing venue in Rio's Guanabara Bay is badly polluted, as is a separate venue for rowing and canoeing — the Rodrigo de Freitas lake — in central Rio. The AP investigation also showed venues for triathlon and open-water swimming off Copacabana Beach are filled with bacteria and viruses that pose a threat to athletes and tourists.