http://www.dnr.state.mn.us/swimming/swimmersitch.html swimmer's itch swimmer's itch Minnesota DNR’s Web site www.dnr.state.mn.us/swimming/swimmersitch.html Minnesota Department of Natural Resources - Swimmer's Itch www.dnr.state.mn.us/swimming/swimmersitch.html Swimmer’s Itch Fact Sheet, U of M Extension