Not only are some 1,400 athletes at risk of getting violently ill in water competitions, but the AP's tests indicate that tourists also face potentially serious health risks on the golden beaches of Ipanema and Copacabana. The AP's survey of the aquatic Olympic and Paralympic venues has revealed consistent and dangerously high levels of viruses from the pollution, a major black eye on Rio's Olympic project that has set off alarm bells among sailors, rowers and open-water swimmers. In light of the findings, biomedical expert Valerie Harwood had one piece of advice for travelers to Rio: "Don't put your head under water."
The most contaminated points are the Rodrigo de Freitas Lagoon, where Olympic rowing will take place, and the Gloria Marina, the starting point for the sailing races. Sampling at the Lagoon in March 2015 revealed an astounding 1.73 billion adenoviruses per liter. By this June, adenovirus readings were lower but still hair-raising at 248 million adenoviruses per liter. By comparison, in California, viral readings in the thousands per liter set off alarm bells. Despite a project aimed at preventing raw sewage from flowing into the Gloria Marina through storm drains, the waters remain just as contaminated. The first sampling there, in March 2015, showed over 26 million adenoviruses per liter. This June, over 37 million adenoviruses per liter were detected.
Cars drive above sewage flowing from the suburb of Sao Goncalo into Guanabara Bay, across the bay from Rio de Janeiro, Brazil. Throughout Brazil, sewage treatment has lagged dramatically, meaning that so-called 'black tongues' of fetid, sewage-filled water are common on beaches across the country
The first results of the AP study published over a year ago showed viral levels at up to 1.7 million times what would be considered worrisome in the United States or Europe. At those concentrations, swimmers and athletes who ingest just three teaspoons of water are almost certain to be infected with viruses that can cause stomach and respiratory illnesses and more rarely heart and brain inflammation - although whether they actually fall ill depends on a series of factors including the strength of the individual's immune system. Since the AP released the initial results last July, athletes have been taking elaborate precautions to prevent illnesses that could potentially knock them out of the competition, including preventatively taking antibiotics, bleaching oars and donning plastic suits and gloves in a bid to limit contact with the water.
But antibiotics combat bacterial infections, not viruses. And the AP investigation found that infectious adenovirus readings - tested with cell cultures and verified with molecular biology protocols - turned up at nearly 90 percent of the test sites over 16 months of testing. "That's a very, very, very high percentage," said Dr. Harwood, chair of the Department of Integrative Biology at the University of South Florida. "Seeing that level of human pathogenic virus is pretty much unheard of in surface waters in the U.S. You would never, ever see these levels because we treat our waste water. You just would not see this."
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Originally Posted by Peter1469
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