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Legionella control

Legionella control

Legionella control

The genus Legionella is a pathogenic group of Gram-negative bacteria, that includes the species L. pneumophila, causing Legionellosis (all illnesses caused by Legionella) including a pneumonia type illness called Legionnaires' disease and a mild flu like illness called Pontiac fever.


Legionella live within amoebae in the natural environment.

Upon inhalation the bacteria can infect alveolar macrophages. subverting the normal host cell machinery to create a niche where the bacteria can replicate. This results in Legionnaires' disease and the lesser form, Pontiac fever. Legionella transmission is airborne via respiratory droplets containing the bacteria.

Once inside a host, incubation may take up to two weeks. Prodromal symptoms are flu-like, including fever, chills, and dry cough. Advanced stages of the disease cause problems with the gastrointestinal tract and the nervous system and lead to diarrhea and nausea. Other advanced symptoms of pneumonia may also present.

Sources of Legionella

Documented sources include cooling towers, swimming pools (especially in Scandinavian countries), domestic water systems and showers, ice making machines, refrigerated cabinets, whirlpool spas, hot springs, fountains, dental equipment, automobile windshield washer fluid and industrial coolant.

The largest and most common source of Legionnaires' disease outbreaks are cooling towers (heat rejection equipment used in air conditioning and industrial cooling water systems) primarily because of the risk for widespread circulation. Many governmental agencies, cooling tower manufacturers, and industrial trade organizations have developed design and maintenance guidelines for controlling the growth and proliferation of Legionella within cooling towers.

The disinfection and control

Miller disinfectant is one of the most powerful disinfectant against Legionella, in ppm "part per million" concentration can destroy the Legionella species, the addition of Miller to cooling tower and air condition can get rid of all Legionella count and by the way prevent it's dangers.  

Review the Miller application

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