On May 25, 2017, the Southern Nevada Health District began investigating a report that two cases of Legionnaires' disease were associated with the Rio All-Suite Hotel and Casino (Rio), Las Vegas NV.  In an effort to identify additional illness that may be associated with potential exposure to Legionella bacteria, we have developed this survey.  The following questions will assist us in identifying cases of Legionnaire's disease and Pontiac Fever associated with staying at the Rio between March 1 and September 21, 2017.  All personal identification information gathered in this survey will be kept confidential in accordance with NRS 441A.220.  Thank you for your participation in this survey.