New Delhi: Stomach problems hit more swimmers on Thursday, forcing two Australian medal prospects to pull out, as a clutch of champions looked to add to their golds and beaten finalists sought revenge.
Olympic bronze medallists Andrew Lauterstein and Hayden Stoeckel failed to start in the 100m butterfly and 100m backstroke heats because of "gastro" problems, a team spokesman told AFP.
Illness forced the much-fancied Lauterstein to miss the 50m butterfly final on Wednesday.
A Canada swimming spokesman said several team members were also suffering from minor complaints but England duo Rebecca Adlington and Fran Halsall had recovered and were cleared to compete, Team England said.
Halsall on Wednesday blamed "Delhi belly" for her failure to qualify for the 100m butterfly final after she took gold in the 50m sprint a day earlier.
She appeared to have recovered and eased into the 50m freestyle semi-finals as fastest qualifier.
World record holder and Olympic champion Adlington is favourite for the 800m final later Thursday.
In the men's 50m breaststroke, world record holder and world champion Cameron Van Der Burgh of South is seeking to double up after winning the 100m event on Wednesday, lowering the Games best for the fourth time in two days
The 22-year-old is again likely to face Australia's Christian Sprenger and Brenton Rickard, who got silver and bronze in the 100m, with New Zealand's Glenn Snyders swimming well.
Emily Seebohm also goes for the one-two in the 50m backstroke following her gold in the 100m on Wednesday, with Sophie Edington and Grace Loh looking to make it a clean sweep for Australia.
Edington is Commonwealth record holder at the event, but the trio could be pushed hard by England's 100m world champion and world record holder Gemma Spofforth, who will be looking to improve on her silver in the 100m.
She qualified fastest for the semi-finals.
The men's 100m butterfly semis feature the gold, silver and bronze medallists from the 50m, with Jason Dunford looking for Kenya's second pool gold, after edging Australia Geoff Huegill and South Africa's Roland Schoeman.
British-educated Dunford, 23, set a Commonwealth record in the World Championships in Rome last year while 31-year-old veteran Huegill is a two-time Games champion at the event.
Defending champion Ryan Pini of Papua New Guinea also looked strong, with the 1-2-3 in the 200m fly -- Canada's Chad Le Clos, England's Michael Rock and Le Clos' teammate Stefan Hirniak -- also looking for a last eight place.
Olympic champion and Commonwealth record holder Leisel Jones of Australia is looking to defend her 100m breaststroke crown for third consecutive Games after her success in the 200m on Wednesday.
Canada's 200m world record holder Annamay Pierse could be her main opponent, although England's Kate Haywood looked strong in the qualifying rounds.
England's Liam Tancock is in line to defend his 100m backstroke title after winning the 50m, where he is world champion and world record holder.
The withdrawal of Stoeckel -- who was second to Tancock in the 50m -- opens the door for any one of four other swimmers, including bronze medallist in the sprint Ashley Delaney of Australia.
Olympic bronze medallists Andrew Lauterstein and Hayden Stoeckel failed to start in the 100m butterfly and 100m backstroke heats because of "gastro" problems, a team spokesman told AFP.
Illness forced the much-fancied Lauterstein to miss the 50m butterfly final on Wednesday.
Halsall on Wednesday blamed "Delhi belly" for her failure to qualify for the 100m butterfly final after she took gold in the 50m sprint a day earlier.
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World record holder and Olympic champion Adlington is favourite for the 800m final later Thursday.
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The 22-year-old is again likely to face Australia's Christian Sprenger and Brenton Rickard, who got silver and bronze in the 100m, with New Zealand's Glenn Snyders swimming well.
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Edington is Commonwealth record holder at the event, but the trio could be pushed hard by England's 100m world champion and world record holder Gemma Spofforth, who will be looking to improve on her silver in the 100m.
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The men's 100m butterfly semis feature the gold, silver and bronze medallists from the 50m, with Jason Dunford looking for Kenya's second pool gold, after edging Australia Geoff Huegill and South Africa's Roland Schoeman.
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Defending champion Ryan Pini of Papua New Guinea also looked strong, with the 1-2-3 in the 200m fly -- Canada's Chad Le Clos, England's Michael Rock and Le Clos' teammate Stefan Hirniak -- also looking for a last eight place.
Olympic champion and Commonwealth record holder Leisel Jones of Australia is looking to defend her 100m breaststroke crown for third consecutive Games after her success in the 200m on Wednesday.
Canada's 200m world record holder Annamay Pierse could be her main opponent, although England's Kate Haywood looked strong in the qualifying rounds.
England's Liam Tancock is in line to defend his 100m backstroke title after winning the 50m, where he is world champion and world record holder.
The withdrawal of Stoeckel -- who was second to Tancock in the 50m -- opens the door for any one of four other swimmers, including bronze medallist in the sprint Ashley Delaney of Australia.
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