Cryptosporidiosis is a gastrointestinal illness due to a protozoan parasite that is highly contagious, and resistant to multiple disinfectants. Utah experienced a large, community-wide outbreak of cryptosporidiosis between June and December of 2007. During this time period, the Utah Department of Health received reports of 1,902 laboratory confirmed cryptosporidiosis cases across the state.2 Nearly 40% of these cases occurred in Salt Lake County (SL County), Utah.