Two guests who stayed at the Wynn Las Vegas hotel and casino have been diagnosed with Legionnaires’ disease, according to the Southern Nevada Health District. The cases, reported on Tuesday (April 28), are linked to separate stays—one in September 2025 and the other in February 2026. Both individuals have since recovered.

Legionnaires’ disease is a severe type of pneumonia that is caused by inhaling water vapor contaminated with Legionella bacteria. The illness can be deadly, killing about one in 10 people who become infected. The bacteria thrive in warm and moist environments, such as hotel plumbing systems or cooling towers.

After learning about the two cases, health officials conducted environmental testing at the Wynn Las Vegas and found multiple water samples positive for Legionella. The Wynn hotel immediately began a comprehensive cleaning and remediation of its water system. Recent tests now show no detectable levels of the bacteria in the affected areas, and the hotel continues to conduct ongoing water safety checks.

The Southern Nevada Health District urges anyone who stayed at the Wynn Las Vegas on or after September 1, 2025, to fill out a confidential illness survey, even if they did not feel sick or their symptoms have resolved. The survey aims to help officials quickly identify additional cases and provide proper follow-up care. Guests can access the survey through the health district’s website or directly at this link.

Symptoms of Legionnaires’ disease can start two to ten days after exposure and may include cough, shortness of breath, fever, muscle aches, and headaches. People over fifty, those with weakened immune systems or chronic lung diseases, and current or former smokers are at higher risk.

The Wynn Las Vegas is cooperating with the health district’s investigation and has notified guests about possible exposure. Anyone currently experiencing symptoms should seek medical attention and inform their doctor about their stay at the hotel. The health district is continuing to monitor the situation and will conduct follow-up testing to ensure guest safety.

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