Centre for Health Protection Reports Two Legionnaires' Disease Cases, Urges Public to Maintain Water Systems

DH announces latest situation of Legionnaires' disease cases

The Centre for Health Protection (CHP) of the Department of Health today (January 12) reported the latest number of Legionnaires' disease (LD) cases, and reminded the public of the importance of using and maintaining properly designed man-made water systems, adding that susceptible groups should strictly observe relevant precautions.

The Centre for Health Protection (CHP), Photo source: reference image

From January 4 to 10, the CHP recorded two community-acquired LD cases. Both patients involved had underlying illnesses. The details of the cases are as follows:

• a 70-year-old male patient living in Kwun Tong District; and

• a 76-year-old male patient living in Tai Po District.

The CHP is conducting epidemiological investigations to identify potential sources of infection and high-risk exposure. Initial investigations revealed that these are sporadic cases. No epidemiological linkages have been established between these twocommunity-acquired cases and other confirmed cases previously recorded in Hong Kong.

As of January 10, two LD cases had been recorded this year. In 2025 and 2024, there were 167 and 135 LD cases respectively.

Men, people aged over 50, smokers, alcoholics and persons with weakened immunity are more susceptible to LD. Some situations may also increase the risk of infection, including poor maintenance of water systems; living in areas with old water systems, cooling towers or fountains; using electric water heaters, whirlpool spas or hot water spring spas; and recent stays in hotels or ships.

Legionellae are found in various environmental settings and grow well in warm water (20 to 45 degrees Celsius). They can be found in aqueous environments such as water tanks, hot and cold water systems, cooling towers, whirlpool spas, water fountains, humidifiers and home respiratory devices that support breathing. People may become infected when they breathe in contaminated droplets (aerosols) and mist generated by artificial water systems, or when handling garden soil, compost and potting mixes.

Immunocompromised persons should:

• Use sterile or boiled water for drinking, tooth brushing and mouth rinsing;

• Avoid using humidifiers, or other mist- or aerosol-generating devices; and

• If using humidifiers, or other mist- or aerosol-generating devices, fill the water tank with only sterile or cooled freshly boiled water, and not water directly from the tap. Also, clean and maintain humidifiers/devices regularly according to manufacturers' instructions. Never leave stagnant water in a humidifier/device. Empty the water tank, wipe all surfaces dry, and change the water daily.

The public should observe the health advice below:

• Observe personal hygiene;

• Do not smoke and avoid alcohol consumption;

• Strainers in water taps and shower heads should be inspected, cleaned, descaled and disinfected regularly or at a frequency recommended by the manufacturer;

• If a fresh-water plumbing system is properly maintained, it is not necessary to install domestic water filters. Use of water filters is not encouraged as clogging occurs easily, which can promote growth of micro-organisms. In case water filters are used, the pore size should be 0.2 micrometres (µm) or less and the filter needs to be changed periodically according to the manufacturer's recommendations;

• Drain and clean water tanks of buildings at least quarterly;

• Drain or purge for at least one minute infrequently used water outlets (e.g. water taps, shower heads and hot water outlets) and stagnant points of the pipework weekly or before use;

• Seek and follow doctors' professional advice regarding the use and maintenance of home respiratory devices and use only sterile water (not distilled or tap water) to clean and fill the reservoir. Clean and maintain the device regularly according to the manufacturer's instructions. After cleaning/disinfection, rinse the device with sterile water, cooled freshly boiled water or water filtered with 0.2 µm filters. Never leave stagnant water in the device. Empty the water tank, keep all surfaces dry, and change the water daily; and

• When handling garden soil, compost and potting mixes:

• Wear gloves and a face mask;

• Water gardens and compost gently using low pressure;

• Open composted potting mixes slowly and make sure the opening is directed away from the face;

• Wet the soil to reduce dust when potting plants; and

• Avoid working in poorly ventilated places such as enclosed greenhouses.

The public may visit the CHP's LD page, the Code of Practice for Prevention of LD and the Housekeeping Guidelines for Cold and Hot Water Systems for Building Management of the Prevention of LD Committee, and the CHP's risk-based strategy for prevention and control of LD.

Photo source: the official website of CHP

Notice on appointments to advisory and statutory bodies

A Government spokesman said today (January 12) that Mr Chan Kin-por recently sought approval from the Chief Executive to suspend his three public positions as appointed by the Chief Executive, until the completion of the work of the Independent Committee in relation to the fire at Wang Fuk Court in Tai Po (Independent Committee). Mr Chan made this request to allow himself more time to dedicate to the work of the Independent Committee. After due consideration, the Chief Executive has agreed to and approved this request. The three public positions are: (1) Chairman of Independent Commission Against Corruption Advisory Committee on Corruption; (2) Non-executive Director of Urban Renewal Authority Board; and (3) Member of Honours and Non-official Justices of the Peace Selection Committee.

On December 12, 2025, the Government established the Independent Committee to examine the causes of the incident and related issues, ascertain the facts, and make recommendations on preventing similar tragedies and on improvement measures. The Independent Committee is chaired by Mr Justice David Lok, with Mr Chan Kin-por and Dr Rex Auyeung Pak-kuen serving as members. The Independent Committee held its first meeting on December 19 last year and aims to complete its work within nine months of commencing operations.

Mr Chan Kin-por wrote earlier to the Chief Executive, expressing his wish to suspend the aforementioned three public positions until the Independent Committee completes its work, in order to dedicate more time and focus to the Independent Committee's tasks. The Chief Executive has agreed to and approved the request.

A Government spokesperson said that since the fire at Wang Fuk Court in Tai Po, both the Government and the wider community have been highly concerned about the causes of the incident and the follow-up work. The scope of the Independent Committee's work is extensive, particularly concerning systemic issues related to bid-rigging and connected interests. Given the numerous issues involved and their complex nature, the Government will fully co-operate with the Independent Committee to ensure that it can complete its work and compile its report within nine months. The Government extends its gratitude to Mr Chan for accepting the appointment as a member of the Independent Committee and for his professional and conscientious approach to the Committee's work. When the Independent Committee's work is completed, the Government looks forward to Mr Chan's continuous contribution through his aforementioned public positions.

Source: AI-found images