Bettina Fabian was hospitalized after falling ill shortly after the women’s 10km open water race held in the Seine on Thursday, Hungarian media reported.

Fabian said on social media that she had been vomiting and also had a fever. She was admitted to hospital with her symptoms, where she was given an IV before flying home to Hungary.

German Leonie Beck also took part in the women’s open water race and suffered from gastrointestinal symptoms such as vomiting and diarrhea afterwards. Beck said in her Instagram story: “Vomited 9 times yesterday + diarrhea” and “the water quality in the Seine is good.”

Fabian finished fifth in the women’s race with a final time of 2:04:16.9, less than a minute slower than Sharon van RouwendaalWinning time of 2:03:34.2 for the Netherlands. Italy’s Ginevra Taddeucci won bronze in 2:03:42.8.

Fabian had told TIME after the race: “It was really tough because we couldn’t really focus on the race.” She continued: “We had to pay attention to the (water) quality and what would happen afterward. We (had to) focus on not swallowing water and being safe (during the race). I saw some brown things; I hope it’s not what I thought. I’m worried, but I brought Hungarian palinka (fruit brandy) with me, so I hope I don’t get sick after (the race).”

The water quality of the Seine has been a cause for concern both in the run-up to the Paris Olympics and during possible training sessions and competitions over the past two weeks. Over a billion euros have been spent cleaning the river to make it usable for the competitions. Swimming in the river has been banned since 1923.

In late June, the river failed a water quality test because it had E. coli levels ten times higher than the permissible limit. NBC also reported during the opening ceremony that the competition would have been postponed if it had been held in Paris that day.

Training sessions have been cancelled for both triathlon and open water athletes over the past two weeks. The men’s triathlon has been postponed to the same day as the women’s triathlon due to poor water quality.

Belgian media reported that triathlete Claire Michel contracted E. coli after the women’s triathlon, but Michel announced on social media that she had been diagnosed with a virus instead and that this was the reason she was hospitalized.

Sweden’s Victor Johansson has decided to withdraw from the men’s 10km open water race on the advice of his doctor due to concerns about water quality. Currents were also a topic of discussion after the open water competitions.