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Legionaries’ Disease (LD)

The recent infection of LD by the education chief Michael Suen Ming-yeung, and the discovery of Legionella bacteria in water samples from the New Government office and the Legislative Council complex have raised public concern over this disease.

LD is an infectious disease that primarily affects the elderly, smokers and patients with Chronic Diseases. It is caused by the bacteria Legionella. The inhalation of the Legionella-contaminated aerosols can then lead to the infection of this disease. There are over 40 species of Legionella identified, and most of the infections are caused by a specific type known as serogroup 1.

The Guidelines of the OSHA Technical Manual for Conducting Legionella Analyses

Type of WaterCountry / OrganizationGuideline Level
Cooling Tower
Hong Kong EMSD Less than 10 cfu/ml
WHO Less than 10 cfu/ml
France Less than 1000 cfu/L
Domestic Water
(Piped Water)
Germany 1000 cfu/L
United Kingdom Less than 100 cfu/L
The Netherlands 100 cfu/L

Legionella testing programs to ensure the safety level of cooling tower water and domestic water

ParameterTesting MethodDetection LimitPrice (HKD)**
Legionella Pneumophila (AS 3896:1998) 10cfu/mL $800
Legionella Pneumophila (AS 3896:1991 - MFM) 10cfu/L $1,200
Legionella Pneumophila
with Fresh Water Plumbing
Maintenance Recognition Scheme
(WSD Scheme) Package*
(AS3896:1998) 10cfu/mL $1,300

* WSD Scheme package includes: Ph value, Color, Turbidity, Conductivity, Iron, E.Coli and Coliform.
** Further discounts will be offered when bulk samples submission.

George Wong

t: +852 2765 3524
f: +852 2363 0212


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