A beach in Iowa is closed after a rare life-threatening infection of the brain was confirmed in a visitor who recently went swimming there. The beach at Lake of Three Fires State Park in Taylor County will be closed temporarily to swimmers, the Iowa Department of Public Health said Friday. "The closure is a precautionary response to a confirmed infection of Naegleria fowleri in a Missouri resident with recent potential exposure while swimming at the beach," according to a release from the health department.