Halsall was visibly unwell when receiving her 100m freestyle bronze
The cause of illness among Commonwealth Games swimmers remains under investigation after tests showed water quality in the pools is up to standard.
England's team leader John Atkinson said 20% of the swim team, including Rebecca Adlington and Fran Halsall, have suffered with stomach problems.
"The tests at all three pools revealed the standard was as required," said Games chief Mike Fennell.
"The investigation into what is causing the problem goes on."
The Australian team blamed the practice pool for several of its swimmers being ill, but Fennell said it had been tested, as well as the village training and competition pools.
"The CGF [Commonwealth Games Federation] doctor has been in touch with the teams and they all agreed that the problems have not been caused by the water," added Fennell.
England await 'dirty pool' test reports
"They could have been caused by a number of other things.
"We are satisfied that we have made all the checks that are necessary on the water in the pools."
England duo Halsall and Adlington both admitted they were feeling unwell on Wednesday.
Halsall, one of the favourites for 100m freestyle gold, looked out of sorts, although she still managed to win a bronze medal.
The Liverpudlian cut short a post-race interview with BBC Sport's Sharron Davies to stop herself from being sick.
She said: "I don't think I'm very well to be honest. I came down with a bit of a tummy bug and had nothing to give, I pretty much couldn't stand up after my final. I need to go before I am sick on you."
Team Doctor Ian Gordon added: "Unfortunately she is just one of quite a few who have gone down with this but she is a bit more high-profile than some of the others.
"It is hygiene related. They have been assiduous in their personal hygiene but everybody is going down with this acutely."
A Commonwealth Games England statement read: "As of today there are 541 England team members in the Village. Over the past 28 days 8% of our team have had some kind of mild stomach conditions.
"These levels are lower than we expected coming into this environment. But we are not complacent and continue to reinforce the need to be vigilant in areas like hand hygiene."
Fennell and Games organising committee chairman Suresh Kalmadi were also asked about ticket sales and if over zealous security was putting spectators off attending.
"Ticket sales are going up and most of the major issues have been sorted out," claimed Kalmadi. "Ticketing is not an issue any more."
Fennell also apologised for an incident at the athletes' village in which three Ugandan officials, including the team's chef de mission, were injured in their vehicle at an entry gate.
A 'tyre killer' device was activated after the radio frequency reader failed to read the vehicle's sticker.
The sharp-edged barrier which stays below the ground when authorised vehicles pass over it rose suddenly and hit the vehicle, leading to the occupants suffering minor cuts and bruises.
"We regret the incident at the athletes' village very much," said Fennell.
Fennell was also questioned about reports of condoms blocking toilets in the athletes' village.
He replied: "If that is happening, it shows there is use of condoms and I think that's a very positive story, that athletes are being responsible."
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