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"Surveillance for Waterborne Disease and Outbreaks Associated with Recreational Water Use and Other Aquatic Facility-Associated Health Events --- United States, 2005--2006." Centers for Disease Control and Prevention. Centers for Disease Control and Prevention, n.d. Web. 29 May 2016.
The graphs above indicates waterborne diseases in the United States.
Acute gastrointestinal illness accounted for what percent of all waterborne illnesses in the U.S. during this time period?