(Reuters)

The United States team is still recovering after suffering an outbreak of acute gastroenteritis ahead of the swimming world championships in Singapore that began on Sunday, a spokesperson told Reuters.

The U.S. team contracted the illness during their pre-meet training camp in Thailand, according to media reports.

On Sunday, Olympic champion Torri Huske did not participate in the women’s 100m butterfly, while 18-year-old Claire Weinstein did not compete in the 400m freestyle.

American great Katie Ledecky did not appear to be affected and qualified fastest for the 400m freestyle final with a time of 4:01.04.