Gastroenteritis affecting American swimmers
Outbreak traced to pre-meet camp in Thailand
Ledecky unaffected, leads 400m freestyle field
The United States swim team is battling an outbreak of acute gastroenteritis that has affected several athletes at the start of the World Aquatics Championships in Singapore.
Team officials confirmed the illness originated during a pre-meet training camp in Phuket, Thailand, and has compromised multiple performances as competition got under way on Sunday.