LAS VEGAS, NV - DECEMBER 28: Clark County Fire Department personnel work outside the darkened Rio Hotel & Casino after an electrical fire in a service elevator on the 27th floor caused a partial power outage on December 28, 2016 in Las Vegas, Nevada. The fire was put out by fire extinguishers before firefighters arrived and no one was injured or evacuated according to the Clark County Fire Department. (Photo by Ethan Miller/Getty Images)

Two guest who stayed separately at the Rio Hotel have come down with Legionnaires Disease. The Southern Nevada Health District is investigating. The guests stayed at the Rio in March and April.

The Rio released a statement Friday afternoon.

“Test results on the water at the Rio All-Suite Hotel and Casino indicated the presence of the legionella bacteria. The company is working closely with the Southern Nevada Health District and taking aggressive remediation actions to ensure the safety of Rio’s water. Out of an abundance of caution, we are relocating guests from rooms where remediation actions are being undertaken.”

After the first case was reported, the resort arranged for environmental testing of its water system. Testing results did indicate a presence of the Legionella bacteria, and the property initiated the appropriate remediation response of chlorine disinfection. When the 2nd case was reported, the Health District conducted sampling of the water system and identified Legionella bacteria throughout the system.  The Health District said they’re working with the Rio to conduct remediation and follow up sampling to ensure remediation efforts are effective.