https://www.mercurynews.com/2019/08/04/u-s-swim-star-katie-ledecky-on-mystery-illness-im-not-lying-when-i-say-i-almost-got-out-at-the-1100-mark/

STANFORD — Swimming superstar Katie Ledecky says she got so sick at the World Championships last month in South Korea that she almost quit in the middle of a race.

“I’m not lying when I say I almost got out at the 1,100 mark,” said Ledecky, who was swimming the 1,500-meter freestyle, a new event for the Olympic Games next summer in Tokyo. “I’ve never felt like that before in the 1,500. I’ve had a lot of 1,500s that have hurt and I put myself through a lot in some of those races, but never have I gotten to the point where I felt I was going to have to get out.”