Wynn Las Vegas Under Investigation for Two Legionnaires’ Disease Cases

Both affected guests have recovered, and the most recent water samples show no detectable levels of Legionella.

The Southern Nevada Health District is investigating two reported cases of Legionnaires' disease linked to Wynn Las Vegas, health officials announced. One guest stayed at the resort in September 2025 and the other in February 2026. Both individuals have since recovered. Environmental sampling conducted on the property confirmed Legionella bacteria was detected in multiple samples, prompting the resort to begin remediation of its water system.

Two Cases Linked to Wynn Las Vegas, Both Guests Recovered

The Southern Nevada Health District confirmed that two individuals who stayed at Wynn Las Vegas tested positive for Legionnaires' disease. One guest visited the property in September 2025, while the other stayed there in February 2026. Health officials say both have recovered from the illness.

Following the reported cases, environmental sampling was conducted throughout the property. Legionella, the bacteria responsible for causing Legionnaires' disease, was positively detected in multiple samples taken from the facility.

Wynn Begins Water System Remediation

After the positive detections, Wynn Las Vegas began a comprehensive revision of its water system. The most recent samples taken from the property did not detect Legionella in the affected areas, though the resort is continuing to conduct follow-up and ongoing testing to ensure the safety of its water supply.

The Southern Nevada Health District says Wynn Las Vegas is cooperating fully with the investigation. The resort has also launched a guest notification system to alert individuals of their potential exposure.

Guests Urged to Complete Confidential Illness Survey

Health officials are encouraging any guests who stayed at Wynn Las Vegas on or after September 1, 2025, to complete a confidential illness survey. The survey is available at alchemer.com. Officials say completing the survey is critical to the investigation and helps identify any additional cases that may be connected to the property.

Those who experienced mild or resolved symptoms are also asked to complete the survey. Anyone currently experiencing symptoms is urged to seek medical attention and inform their healthcare provider of any possible exposure to Legionella at the resort.

Symptoms, Timeline, and At-Risk Groups

Symptoms of Legionnaires' disease can include cough, shortness of breath, fever, muscle aches, and headaches. According to health officials, symptoms typically appear within two to ten days after exposure and can persist for up to two weeks.

Certain populations face a higher risk of serious illness from Legionnaires' disease. These include people over the age of 50, individuals with weakened immune systems, current or former smokers, people with underlying illnesses, and those with chronic lung disease. The Health District is urging members of these groups who stayed at the property to be especially vigilant and seek care if symptoms develop.

The property will continue implementing precautionary measures to mitigate further risks, according to the Southern Nevada Health District. Officials say the Wynn's cooperation and proactive steps, including the guest notification system and ongoing water testing, are part of the broader effort to contain any potential spread.

What we know

• The Southern Nevada Health District is investigating two reported cases of Legionnaires' disease linked to Wynn Las Vegas.
• One guest stayed at Wynn Las Vegas in September 2025 and the other in February 2026; both have recovered.
• Legionella bacteria was positively detected in multiple environmental samples taken from the Wynn Las Vegas property.
• The most recent water samples from Wynn Las Vegas show no detectable levels of Legionella in the affected areas.
• Wynn Las Vegas has launched a guest notification system and is cooperating with the Southern Nevada Health District investigation.
• Guests who stayed at Wynn Las Vegas on or after September 1, 2025, are encouraged to complete a confidential illness survey at alchemer.com.
• Symptoms of Legionnaires' disease can include cough, shortness of breath, fever, muscle aches, and headaches, appearing within two to ten days of exposure.
• At-risk groups include people over 50, those with weakened immune systems, current or former smokers, people with underlying illnesses, and those with chronic lung disease.

Why it matters

Legionnaires' disease is a serious form of pneumonia that can be life-threatening, particularly for vulnerable populations. Wynn Las Vegas is one of the Strip's most prominent resorts, drawing tens of thousands of visitors annually. The detection of Legionella in multiple water samples raises public health concerns for past and potentially future guests. The Southern Nevada Health District's investigation and the resort's remediation efforts are critical to ensuring the safety of visitors and preventing additional cases from going undetected.

What’s next

Wynn Las Vegas will continue conducting follow-up water testing to confirm that Legionella levels remain undetectable. The Southern Nevada Health District is asking guests who stayed at the property on or after September 1, 2025, to complete the confidential illness survey at alchemer.com. The survey is described as critical to identifying any additional cases connected to the property. Anyone experiencing symptoms is advised to seek medical attention immediately.

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