CHP Reports Five Legionnaires' Disease Cases, Urges Public to Maintain Water Systems and Follow Health Precautions

DH announces latest situation of Legionnaires' disease cases

The Centre for Health Protection (CHP) of the Department of Health today (December 8) 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.

From November 30 to December 6, the CHP recorded four community-acquired and one imported LD cases. All five patients had underlying illnesses.

Community-acquired cases

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• a 69-year-old male patient living in Eastern District;

• a 45-year-old female patient living in Eastern District;

• a 90-year-old male patient living in Kowloon City District; and

• a 73-year-old male patient living in Kwun Tong District.

Imported case

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• a 77-year-old male patient who travelled to the Chinese Mainland during the incubation period.

​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 five cases and other confirmed cases previously recorded in Hong Kong.

As of December 6, 156 LD cases had been recorded this year. In 2024 and 2023, there were 135 and 121 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, whirlpools and spas or hot water spring spas; and recent stays in hotels or vessels.

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, whirlpools and spas, water fountains and home apparatus 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.

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​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) 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.

Source: AI-found images

Employers, contractors and employees should be aware of electrical safety at work during rainstorms

As the rainstorm warning has been issued by the Hong Kong Observatory, the Labour Department (LD) reminds employers and contractors that they should adopt necessary work arrangements and take suitable safety measures to protect the safety of their employees when they are carrying out electrical work or handling electrical plant.

A spokesman for the LD said today (March 3) that employers and contractors should avoid assigning employees to carry out electrical work (such as electric arc welding work) or handle electrical plant at places affected by rainstorms, and should refer to the "Code of Practice in Times of Adverse Weather and 'Extreme Conditions'" and the "Guide on Safety at Work in times of Inclement Weather" issued by the LD.

Even if electrical work is carried out or electrical plant is handled at places not affected by a rainstorm, suitable safety measures must still be adopted to prevent an electric shock as the air would be more humid. Such measures include:

(i) Ensure that all live parts of an electrical installation are isolated from the power supply source and rendered dead, and the isolation from the power supply source must be maintained as long as electrical work is being carried out;

(ii) Before carrying out any electrical work or handling any electrical plant, cut off and lock out the power supply source, then test the circuit concerned to confirm that it is dead and display suitable warning notices, and issue a work permit thereafter;

(iii) Ensure that protective devices (such as suitable and adequate fuses and circuit breakers) for the electrical installations or electrical plant have been installed and maintained in good working order, and portable electric tools must be double-insulated or properly earthed;

(iv) Provide suitable personal protective equipment such as insulating gloves and insulating mats for employees; and

(v) If live electrical work is unavoidable, a comprehensive risk assessment should be conducted by a competent person and the appropriate safety precautions should be taken to remove or properly control the electrical hazards involved before such work can proceed.

In addition, employees should co-operate with the employer or contractor to follow the safety instructions and use the safety equipment provided.

The LD has published guidebooks and leaflets on electrical work safety. These safety publications are available free from divisional offices of the department or can be downloaded from its website (www.labour.gov.hk/eng/public/content2_8.htm).

Should there be any questions about occupational safety and health matters, please contact the Occupational Safety Officer of the LD at 2559 2297.

Source: AI-found images