Water-borne illnesses have been increasing this year around Wyoming’s swimming pools and Teton County has joined with the state in advising the public about steps to avoid catching or spreading them. Teton County Public Health Response Coordinator Tammy Marshall says symptoms of the diseases can occur days or even weeks after exposure. Most commonly, cryptosporidiosis and giardiasis can cause such symptoms as diarrhea, stomach cramping, nausea and loss of appetite. The diseases are caused when parasites or bacteria get into places the public swims because those frequenting them are not clean when they enter the water and the water becomes contaminated with fecal matter. Marshall says the number of cases seen in Wyoming is currently about three times the national rate.