A rash of Delhi belly cases has laid low as many as 50 international swimmers, here to compete at the Commonwealth Games.The unusually large number of complaints has forced an immediate inquiry into the water quality at the Shyama Prasad Mukherjee Aquatics Complex, an obvious suspect since almost all those reporting to the sickbay have been swimmers.Ravi Kumar smashes CWG record | Renu Bala win first lifting goldAmong those suffering the pesky viral infection are a dozen Australian swimmers. Two of them – Andrew Lauterstein and Hayden Stoeckel – had to pull out of their heats on Wednesday after severe cramps kept them bedbound.EnglandEngland’s Rebecca Adlington has been badly hit by the stomach bugSuch was the plight of former Olympic medallist Geoff Huegill that he rushed “straight to the bathroom” after getting off the team bus. From the English camp, champion swimmer Francesca Halsall tweeted her anguish and frustration.Deeply bothered, she said: “Tummy still not fab? very very hard to get out of bed. I hope the piece of bread I had for tea gets me through the heats.” Halsall wasn’t the only one in her team to report sick.Rebecca Adlington too was under the weather. On Wednesday, Halsall failed to qualify for the 100m butterfly final after she won the gold medal in the 50m event and blamed “Delhi belly” for her failed attempt.Complaining of a revolting stomach, Adlington, said she was eating light food and keeping away from chicken. “? I ate pasta.” England team spokesperson Dave Richards conveyed the extent of the outbreak in his camp: “Till last evening, 20 per cent of our swimmers had an upset stomach and a few of them are on course of recovery. We’ve asked the organisers for tests to be conducted on the water at the main pool and the warm- up area.advertisement”We have 541 athletes and officials in Delhi and over the 28 days since the first ones arrived, seven to 10 per cent have suffered a mild stomach bug, which has lasted 24 hours.” England has asked the organisers for an assurance on the water quality at the aquatics complex.English swimmers Ryan Napoleon and Rob Hurley, along with team coach Matt Brown, were the first to complain of grumbling tummies. Butterfly and freestyle swimmer Marieke Guehrer joined the queue but recovered sufficiently to compete.Concerned over the ailments Commonwealth Games Federation (CGF) chief Michael Fennell has ordered an immediate investigation.He assured that the matter would be taken up on an urgent basis and the issue was of “paramount” concern. “Let’s not speculate. If there’s something unsafe, you can’t swim in that water. So we’ll have to deal with it with the greatest of urgency.” Even though the water at the S. P. Mukherjee complex looked suspect, competition manager Kamlesh Nanavati was dismissive of all such possibility.”I have the water testing certificates. These are in accordance with FINA (the world governing body for swimming). There is no problem at all. In any case, the water quality is checked every day without fail.”Those who weren’t quite willing to find a culprit in the pool suggested the problem could be because of “casual dining”. Or, there could be a problem with the food being served at the complex.In fact, Halsall seemed to suggest as much in her tweet: “I think it’s more to do with food and hygiene than the water at the pool.” Still, it was curious that most of those reporting the stomach bug were swimmers.Australian chef-de-mission Steve Moneghetti sounded worried: “There seems to be a larger number of swimmers. It seems quite isolated to the swim team at the moment.” He didn’t subscribe to the casual dining argument. “Why only swimmers then, why not others,” he asked.”The doctor doesn’t think it is food related because it’s more confined to one sport. All of us eat at the dining hall. We eat the same food and there are very few cases across the board,” he said.The Australian swimmers seemed to be in more than just a spot of bother. Spokesperson Lachlan Searle confirmed that two swimmers had pulled out with stomach bugs and the list includes 10 other.”Yes, our swimmers have taken ill but at the moment we don’t want to speculate about anything and let the results for the (water) tests come out,” he said.Team coach Leigh Nugent said both Lauterstein and Stoeckel had symptoms of vomiting, diarrhoea and fever. Their absence from the competition would hit the team hard. “They are the two spearheads in our team, our No.advertisement1 butterfly swimmer (Lauterstein) and the No. 1 backstroker (Stoeckel), but that’s one of the reasons you come with a number of people – to have cover for such things.” South African swimmer Cameron van der Burgh also claimed that as many as nine of his team members were facing similar problems.”We have nine members in the team who have reported Delhi belly symptoms but I wonder if we can blame the quality of water here,” van der Burgh said soon after qualifying for the men’s 50m breaststroke final on Thursday.