In this Saturday, Aug. 8, 2015 photo released by Inovafoto, U.S. rowers, from left, Kaitlyn Kynast, Dana Moffat, Marlee Blue and Katy Gillingham celebrate winning the Junior Women's Four - Final competition at the World Rowing Junior Championships at Rodrigo de Freitas lake in Rio de Janeiro, Brazil. American rowing officials are investigating why some rowers on their team came down with gastrointestinal illness at the contest, an event that concluded over the weekend and is being used as a trial run for next year's Rio de Janeiro Olympics. (AP Photo/Alexandre Loureiro-Inovafoto)