Major Concerns About Raw Sewage and the Water Quality in Rio

World Health Organization sounds the alarm for some 1,400 athletes set to compete in seemingly polluted waters.
1:40 | 08/04/16

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Transcript for Major Concerns About Raw Sewage and the Water Quality in Rio
Tonight to Rio the opening ceremony for the Olympics just two days away now and tonight there are lingering fears. About the Waterford which athletes will be competing ABC's chief medical editor doctor Richard best are traveling to Rio to test what's in the water. Tonight the water around Rio is under the microscope. The World Health Organization is sounding the alarm for some four. 14100 Olympic athletes sit to compete in these polluted waters we took a look from the air. Where we could see the pipes directing we're told and treated sewage straight into the water. But up close garbage debris and worse. Here's something you see all over Rio raw sewage streaming into waterways that lead after the bay were there holding a lot of the Olympic events. That's a big health concern in that sewage. Viruses bacteria that can cause severe infections. The WHO is now telling athletes to avoid swallowing water cover open cuts in wash immediately after exposure. Olympic officials insist the water is safe. But to see first selves we collected a sample in two different spots in took them to a lab outside Rio. And doctor Richard best are with us tonight and rich as we await those lab results likely tomorrow night right here in the meantime the warning already from the World Health Organization that you just reported on. Telling athletes to avoid swallowing water avoid open cuts in the water. That's alarming. That is alarming you know you would not expected athletes coming to the Olympics would have to take those precautions. But these aren't typical games the athletes this year are going to be competing at what we think is close to raw sewage. All right doctor bes or would this and the results on the way rich thank you.

This transcript has been automatically generated and may not be 100% accurate.

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