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Alisea News


Legionellosis risk at schools: how to prevent it?

Legionellosis often represents a not considered risk in biological risk evaluation of schools, but epidemics have been discovered in environments like schools, hotels and hospitals


Evidences of legionellosis in a Capannoli plant

Security measures has been immediate for the infected rooms. These measures have been activated by a major's decree to debilitate the dangerous bacterium


From the risk analysis the remediation activity and risk management programme, Alisea certifies the sanitisation of the systems treated.

The initial phase of the process is represented by the Risk Analysis during which all the “risk factors” deriving from the presence of Legionella spp in the sanitary and/or cooling water /are identified. In this phase all the risks relating to the system (e.g. equipment installed, dead branches etc.), operating factors (e.g. operating temperature, systems management etc) and human factors (e.g. type and health condition of the occupants, sensitive areas etc) are analysed. Obviously this stage cannot be separated from microbiological Monitoring of the water in order to assess the Legionella spp concentration.

From the risk analysis and the results of the microbiological monitoring a Risk Assessment document is created containing all the data, analysis and considerations collected in the previous phase.

On the basis of the results obtained it may be necessary to proceed with Corrective Action, also called “control measures” that can be different depending on the level of risk. The action can be related to systems management (e.g. adjustments to operating temperatures, elimination of dead branches etc) or can be remedial action through Remediation of the water system.

In order to assess the actual effectiveness of the treatment technical and microbiological checks are carried out on the system afterwards accompanied by a technical report to Validate the work carried out. In the event the results demonstrate that the treatment was not effective it is necessary to repeat the process until the results indicate that the situation has been rectified.

All work and analysis carried out must be recorded in the Risk management Programme.

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