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Chapter 81 : UV Light for Elimination of Legionellae

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UV Light for Elimination of Legionellae, Page 1 of 2

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Abstract:

Aquatic bacteria of the genus are causative agents of severe nosocomial pneumonia with high case-fatality rates. There are different methods for the control and eradication of legionellae in water systems. Focal modalities include UV light, instantaneous heating, and ozone. An investigation took place in an internal hospital department with 375 beds (11,331 patients in 1999) with a separate copper pipe water system. This investigation determined whether maintaining a hot water temperature in water heaters at >50№C (122№F) with an additional central flowthrough UV sterilizer (power 85 W, 5 m/h) was as efficient as maintaining a hot water temperature in water heaters at >60№C to control legionellae in a hospital water system. In all the rooms A, B, and C, the differences of legionellae counts between a hot water temperature in the water tank at >60ºC and a temperature of >50№C with UV light were significant. The differences in temperature were significant in room C and outlet D. There was no significant difference in legionella count in the probes of location D. The water sampled closest to the sterilizer (outlet D) has the same results with both types of water preparation in spite of different water temperatures at the outlet. That means a hot water temperature of >50№C with UV sterilization kills legionellae in the incoming water as efficiently as a water temperature of >60№C.

Citation: Eckmanns T, Schwab F, Gastmeier P, Riiden H, Posselt H. 2002. UV Light for Elimination of Legionellae, p 402-405. In Marre R, Abu Kwaik Y, Bartlett C, Cianciotto N, Fields B, Frosch M, Hacker J, Lück P (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555817985.ch81

Key Concept Ranking

Aquatic Bacteria
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Water
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Figures

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FIGURE 1

Water system with different water outlets. The water outlets A, B, C, and D are at different distances from the main tank.

Citation: Eckmanns T, Schwab F, Gastmeier P, Riiden H, Posselt H. 2002. UV Light for Elimination of Legionellae, p 402-405. In Marre R, Abu Kwaik Y, Bartlett C, Cianciotto N, Fields B, Frosch M, Hacker J, Lück P (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555817985.ch81
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References

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1. Deutsche Industrienorm 1988-7. 1988. Technische Regeln fur Trinkwasser-Installationen; Vermeidung von Korrosionsschàden und Steinbildung; technische Regel des DVGW. Beuth, Berlin, Germany.
2. Hospital Infection Control Practices Advisory Committee. 1997. Guidelines for prevention of nosocomial pneumonia. Morb. Mortal. Wkly. Rep. 46:179.
3. Kusnetsov, J. M.,, P. J. Keskitalo,, H. E. Aho-nen,, A. I. Tulkki,, I. T. Miettinen,, and P. J. Martikanen. 1994. Growth of Legionella and other heterotrophic bacteria in a circulating cooling water system exposed to ultraviolet irradiation. J. Appl. Bacteriol. 77:461466.
4. Miyamoto, M.,, Y. Yamaguchi,, and M. Sasatsu. 2000. Disinfectant effects of hot water, ultraviolet light, silver ions and chlorine on strains of Legionella and nontuberculous mycobacteria. Microbios 101:713.
5. Stout, J. E.,, and V. L. Yu,. 1999. Nosocomial legionella infection, p. 453465. In C. G. Mayhall (éd.), Hospital Epidemiology and Infection Control, 2nd ed. Lippincott Williams & Wilkins, Philadelphia, Pa.
6. Tobiansky, L.,, A. Drath,, B. Dubery,, and H. J. Koornhof. 1986. Seasonality of Legionella isolates from environmental sources. Isr. J. Med. Sci. 22:640643.
7. Wendt, C.,, K. Weist,, E. Dietz,, P. Schlatt-inann,, and H. Riiden. 1995. Field study to obtain Legionella-free water from showers and sinks of a transplantation unit by a system of water filters. Zentbl. Hyg. Umweltmed. 196:515531.

Tables

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TABLE 1

Number of legionellae in samples of hot water maintained at a temperature of >60°C and hot water maintained at a temperature of >50°C with additional UV sterilization and corresponding values

Citation: Eckmanns T, Schwab F, Gastmeier P, Riiden H, Posselt H. 2002. UV Light for Elimination of Legionellae, p 402-405. In Marre R, Abu Kwaik Y, Bartlett C, Cianciotto N, Fields B, Frosch M, Hacker J, Lück P (ed), . ASM Press, Washington, DC. doi: 10.1128/9781555817985.ch81

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