Health and Me

Ishita Roy

Legionnaires’ Outbreak: Norwegian Cruise Line Probes Two Cases Linked to December Encore Sailing

Norwegian Cruise Line has notified passengers about two confirmed cases of <span>Legionnaires</span>’ disease linked to a December 2025 sailing aboard its ship, the Norwegian Encore.

In a letter dated February 12 and addressed to recent guests, the cruise operator said it is working with the Centers for Disease Control and Prevention (CDC) to investigate the illnesses. The two passengers were diagnosed after traveling on the vessel late last year.

<h2>What Is Legionnaires’ Disease?</h2>

Legionnaires’ disease is a serious type of pneumonia caused by Legionella bacteria. According to the cruise line’s letter, people become ill when they inhale tiny water droplets that contain the bacteria.

Unlike many respiratory infections, Legionnaires’ disease does not spread from person to person. Instead, the bacteria can grow in water systems and occasionally spread through mist or vapor from fixtures such as hot tubs, showers, whirlpool bathtubs, decorative fountains and misters.

The CDC notes that symptoms usually appear between two and 14 days after exposure, though in some cases they may take longer. The illness often resembles pneumonia and can include cough, fever, headache, muscle aches and shortness of breath. Some patients may also experience confusion, diarrhea or nausea.

While most people exposed to Legionella bacteria do not become sick, certain groups face a higher risk. Adults over 50, current or former smokers and individuals with underlying health conditions are considered more vulnerable to severe infection.

<h2>Investigation Underway, Tests So Far Negative</h2>

In its communication to passengers, Norwegian Cruise Line said it has launched onboard testing for Legionella bacteria. The testing includes water systems and fixtures such as hot tubs, showers and faucets.

“So far, all test results have been negative,” the company stated. It added that it remains unclear whether the two passengers were exposed through the ship’s water system or from another source unrelated to the cruise.

The cruise line urged anyone currently sailing or who recently disembarked from the Norwegian Encore to monitor their health. Guests who develop symptoms within 14 days of the end of their cruise have been advised to contact the ship’s medical staff and seek immediate medical attention.

In a statement issued February 13, a spokesperson for the CDC confirmed to PEOPLE that the agency is aware of the cases associated with the Norwegian Cruise Line vessel and is supporting the investigation.

The development follows a separate CDC report released in October 2024 that examined 12 cases of Legionnaires’ disease identified among travelers on two cruise ships between November 2022 and June 2024. In that earlier investigation, private balcony hot tubs were identified as the likely source of exposure in two outbreaks.

The CDC noted that private hot tubs are often subject to less stringent operating requirements than public ones. The agency also warned that certain features — including outdoor placement, water retention between uses and systems involving recirculation, filtration or heating — can increase the risk of Legionella growth and transmission.

For now, health officials and the cruise line continue to investigate the source of the recent cases, as passengers are reminded to remain alert to symptoms and seek prompt care if they feel unwell.

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Norwegian Cruise Line has notified passengers about two confirmed cases of Legionnaires’ disease linked to a December 2025 sailing aboard its ship, the Norwegian Encore.In a letter dated February 12 and addressed to recent guests, the cruise operator said it is working with the Centers for Disease Control and Prevention (CDC) to investigate the illnesses. The two passengers were diagnosed after traveling on the vessel late last year.What Is Legionnaires’ Disease?Legionnaires’ disease is a serious type of pneumonia caused by Legionella bacteria. According to the cruise line’s letter, people become ill when they inhale tiny water droplets that contain the bacteria.Unlike many respiratory infections, Legionnaires’ disease does not spread from person to person. Instead, the bacteria can grow in water systems and occasionally spread through mist or vapor from fixtures such as hot tubs, showers, whirlpool bathtubs, decorative fountains and misters.The CDC notes that symptoms usually appear between two and 14 days after exposure, though in some cases they may take longer. The illness often resembles pneumonia and can include cough, fever, headache, muscle aches and shortness of breath. Some patients may also experience confusion, diarrhea or nausea.While most people exposed to Legionella bacteria do not become sick, certain groups face a higher risk. Adults over 50, current or former smokers and individuals with underlying health conditions are considered more vulnerable to severe infection.Investigation Underway, Tests So Far NegativeIn its communication to passengers, Norwegian Cruise Line said it has launched onboard testing for Legionella bacteria. The testing includes water systems and fixtures such as hot tubs, showers and faucets.“So far, all test results have been negative,” the company stated. It added that it remains unclear whether the two passengers were exposed through the ship’s water system or from another source unrelated to the cruise.The cruise line urged anyone currently sailing or who recently disembarked from the Norwegian Encore to monitor their health. Guests who develop symptoms within 14 days of the end of their cruise have been advised to contact the ship’s medical staff and seek immediate medical attention.CDC Monitoring the SituationIn a statement issued February 13, a spokesperson for the CDC confirmed to PEOPLE that the agency is aware of the cases associated with the Norwegian Cruise Line vessel and is supporting the investigation.The development follows a separate CDC report released in October 2024 that examined 12 cases of Legionnaires’ disease identified among travelers on two cruise ships between November 2022 and June 2024. In that earlier investigation, private balcony hot tubs were identified as the likely source of exposure in two outbreaks.The CDC noted that private hot tubs are often subject to less stringent operating requirements than public ones. The agency also warned that certain features — including outdoor placement, water retention between uses and systems involving recirculation, filtration or heating — can increase the risk of Legionella growth and transmission.For now, health officials and the cruise line continue to investigate the source of the recent cases, as passengers are reminded to remain alert to symptoms and seek prompt care if they feel unwell.