Yesterday’s Paralympic test events were all switched to duathlons for the same reason, and after reviewing the situation this morning World Triathlon made the decision to do the same thing for today’s mixed relay.

Explaining the switch to a duathlon World Triathlon said in a statement issued yesterday: "We have observed a significant discrepancy on the data between the results of the latest water quality tests provided by the laboratory and the high frequency sample analysers."

Earlier this month an Open Water Swimming World Cup, which was also a Paris 2024 test event, was cancelled, after the River Seine's water quality was judged to be below acceptable standards.

In its duathlon format, today’s mixed relay consisted of a run lap over the Alexandre III and Invalides bridges, two 2.9 kilometres bike laps down the Champs Elysees and then two more 900 metres running laps for each of the four athletes.

The race came down to the final running laps for the last of the four athletes, with Germany’s Laura Lindemann outsprinting Britain’s Beth Potter to claim gold.

Potter had claimed the women’s race victory on Thursday (August 17) on the opening day of the Paris 2024 triathlon test event, thanks to a late sprint, but she could not repeat the feat on this occasion.

The German line-up that took gold in the mixed relay was Tim Hellwig, Lisa Tertsch, Jonas Schomburg and Lindemann, finishing in a time of 1hour 12min 18sec.

Britain’s line-up of Barclay Izzard, Kate Waugh, Alex Yee, who won the men’s race on day two of the Paris 2024 test event on Friday (August 18) and Potter finished a second behind their rivals in a time of 1:12.19.

The podium was completed by Belgium’s quartet of Arnaud Mengal, Jolien Vermeylen, Jelle Geens and Claire Michel in 1:12.36.

Michel passed France’s Emma Lombardi late in the final run to secure the final podium spot for her nation.

The previous day the Para triathlon disciplines took centre stage with competition also taking place in a duathlon format due to discrepancies with water testing in the Seine.

In the PTS5 category, the men’s race was won by Chris Hammer of the United States, who pulled away on the final run.

In the women’s, victory went to reigning Paralympic champion Grace Norman of the United States, who won by more than two minutes.

In the PTVI category, German Anja Renner, a B3 athlete, took victory in the women’s race, thanks to an impressive display on the bike.

In the men’s PTVI race, Britain’s Dave Ellis, a B3 athlete took the win, after Kyle Coon of the United States and his guide miscounted the number of laps in the concluding run segment and came down the blue carpet too early.

The men’s PTS2 crown went to Maurits Morsink of the Netherlands, who took control in the opening run phase, and did not look back as he raced away with the win.

In the women’s PTS2 race former rower Anu Francis of Australia claimed victory with a big finish on the final run phase.

In the men’s PTS3 race Daniel Molina of Spain used all his experience to take victory in a tight contest.

Elise Marc of France took victory in a women’s PTS3 race where only two of the three participants finished.

In the women’s PTS4 race, a dominant display on the bike by Kelly Elmlinger gave the American victory.

Paralympic champion Alexis Hanquinquant of France took victory in the men’s PTS4 race, beating compatriot Pierre-Antoine Baele by seven seconds.

Finally in the PTWC races, the victory in the men’s event went to Paralympic champion Jetze Plat of the Netherlands, who took control on the bike.

An explosive bike stage from Australia’s Lauren Parker was enough for her to take the win in the women’s PTWC race.