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:: Volume 11, Issue 1 (Iranian South Medical of Journal 2008) ::
Iran South Med J 2008, 11(1): 55-60 Back to browse issues page
Frequency of legionella contamination in conditional & water distribution systems of Tehran hospitals
Davod Esmaieli Mr 1, Ashraf Mohebati-mobarez Ms, Seyed Reza Hosaini Dust Mr
1- , Esmaeili14@Yahoo.com
Abstract:   (14870 Views)
Background: Legionella species are ubiquitous in natural aquatic environments, capable of existing in waters with varied temperatures, PH levels, and nutrient and oxygen contents. Of 49 known legionella species, 20 species have been linked to pneumonia in humans. Contamination by legionella has occurred in the distribution systems of many hospitals. Aerosol-generating systems such as faucets, showerheads, cooling towers, and nebulizers are responsible for their transmission from water to air. Methods: A total of 113 water samples were gathered from different wards of 32 hospitals in different geographical regions of Tehran city. These samples were concentrated by filtration, treated with the acid and temperature buffers, and isolated on a BCYE agar culture medium. Results: A total of 22 hospitals out of 33 (26.5%) were contaminated by legionella species, and 30 samples (26.5%) out of 113 were positive. Chlorine concentration and pH level of the water samples were 0.18-2.2 mg/l and 6.6-7.6, respectively. Conclusion: The high rate of waste water contamination in Tehran hospitals with Legionella indicates the resistance of this microorganism to chlorine and other disinfectants, or inadequate disinfection process, representing the insufficiency of the current decontamination of hospital water distribution system. Thus identifying legionella species and their controlling in water distribution system of hospitals is of great importance.
Keywords: legionella, water distribution systems, nasocomial infection, chlorine
Full-Text [PDF 226 kb]   (1330 Downloads)    
Type of Study: Original | Subject: General
Received: 2009/02/22 | Accepted: 2009/02/22 | Published: 2009/02/22
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Esmaieli D, Mohebati-mobarez A, Hosaini Dust S R. Frequency of legionella contamination in conditional & water distribution systems of Tehran hospitals. Iran South Med J. 2008; 11 (1) :55-60
URL: http://ismj.bpums.ac.ir/article-1-137-en.html

Volume 11, Issue 1 (Iranian South Medical of Journal 2008) Back to browse issues page
دانشگاه علوم پزشکی بوشهر، طب جنوب ISMJ

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