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tons of garbage flow into the bay every day. he says raw sewage from 8 million people have turning some stretches of these tropical waters jet black. oceanographer david zee says in the water where sailors will compete researchers found samples of so-called super bacteria that's resisted to antibiotics. >> would you let your children swim in this watter? >> no, for sure not. you know, the water is not safe enough. >> reporter: according to an investigation by the associated press, a single virus reading in the lake tested up to 1.7 million times what's considered hazardous on a southern california beach. brazilian officials challenge that report's methodology. the international olympic committee also said world health experts found no significant risk to athletes. but neither the brazilian company or the ioc has tested for viruses, only bacteria.