Canada’s McIntosh grabs fourth gold to cap dominant world swimming championships  CTV NewsSummer McIntosh wins gold at 400M individual medley at swimming world championships  TSNKatie Ledecky wins seventh consecutive world title in 800 freestyle  NBC NewsMcIntosh claims fourth gold medal at World Aquatics Championships  olympic.caBruce Arthur: Summer McIntosh wins fourth gold at world aquatic championships, joining list of legendary swimmers  Toronto Star