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Water Treatment Newsletter...

Published Quarterly For The Benefit Of The Water Treatment Chemical User Volume 8 Spring 2002 Latest Legionnaires Research Findings Suggest Control Procedure Changes...

(REPRINT OF ARTICLE FROM VOLUME 5 OF WATER TREATMENT NEWSLETTER)...

Disease, a form of pneumonia caused by a species of bacteria known as Legionella pneumophila, is a problem that building owners, facility managers and engineering personnel have dealt with as a water treatment issue for 25 years. The first identified outbreak of the disease occurred at an American Legion convention in Philadelphia in 1976. The source of the outbreak was identified at the time as a cooling tower that serviced the air conditioning system in the hotel in which the convention was being held....

Legionnaires...

enters the lung rather than the stomach. This is what is sometimes referred to as "swallowing down the wrong pipe." The protective mechanisms that prevent aspiration are defective in persons who smoke or have lung disease. It now appears that aspiration is more prevalent than inhalation as a means of transmission....

The new research further suggests that...

exposure to even a very small number of Legionella pneumophila bacteria can result in disease in susceptible persons (smokers, persons with lung disease, the elderly, those with suppressed immune systems and others)....

From the time of that first outbreak until very...

recently, the conventional wisdom among microbiologists and members of the medical community was that the sole means of transmission of Legionnaires Disease was through inhalation of an aerosol or mist of water contaminated with Legionella pneumophila. Devices that created water aerosols were considered potential sources, including spas, hot tubs, grocery store vegetable misters, shower heads and, especially, cooling towers....

This new information on the mode of...

transmission of Legionella requires changes in the ways in which building engineers and facilities managers assess and control the risk of an outbreak of Legionnaires Disease. Where they have previously focused almost entirely on the maintenance and treatment of cooling towers and other aerosolizing devices in their Legionella control efforts, they must now look at their water distribution system as presenting the greatest potential for serving as a Legionnaires outbreak source. In particular, domestic hot water storage tanks are prime locations for Legionella colonization. Continued on back page........ This Newsletter ...

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Water Treatment News 08 - Legionnaires Disease.pdf docarchive news water treatment news 08 legionnaires disease

About International Chemtex Corp.

International Chemtex Corporation - Manufacturer of water treatment chemicals for boilers, chillers, closed loops, cooling towers, process water, grease traps, and reagents

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