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This article is part of the supplement: International Conference on Prevention & Infection Control (ICPIC 2011)

Open Access Poster presentation

Hospital point-of-use water filtration to prevent exposure to waterborne pathogens

SM Camps1*, AJ Rijs1, B de Graaf2, AH Paulitsch3, PE Verweij1 and A Voss1

  • * Corresponding author: SM Camps

Author Affiliations

1 Medical Microbiology, Radboud University Nijmegen Medical Centre, Nijmegen, Netherlands

2 Vitens Laboratories, Netherlands

3 Wetsus, Leeuwarden, Netherlands

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BMC Proceedings 2011, 5(Suppl 6):P310  doi:10.1186/1753-6561-5-S6-P310


The electronic version of this article is the complete one and can be found online at: http://www.biomedcentral.com/1753-6561/5/S6/P310


Published:29 June 2011

© 2011 Camps et al; licensee BioMed Central Ltd.

This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Introduction / objectives

Hospital water systems have regularly been shown to serve as a reservoir for waterborne pathogens such as Legionella spp, Mycobacteria spp and fungi, all able to cause life-threatening infections especially in immunocompromised patients. In this study, the suitability of new point-of-use water filters was evaluated in a clinical setting.

Methods

During a routine control of hospital water, contamination with Legionella spp. was detected. To protect the patients from exposure to Legionella, shower heads were replaced by point-of-use shower filters (H2OK medical filters, Norit Filtrix, The Netherlands). The efficacy of 4 shower filters was tested during 5 weeks. Water samples were taken with and without use of the shower filter and were analyzed for the presence of Legionella, heterotrophic plate count (HPC), and fungi. After 5 weeks of use, shower filters were examined using scanning electron microscopy (SEM).

Results

96% of the samples taken without the filter were positive for Legionella whereas all filtered water samples were Legionella free. Although other bacteria were present in the filtered water, the HPC was significantly reduced compared to the unfiltered water. Fusarium oxysporum and Fusarium solani were regularly detected in samples taken without shower filter but were never observed in filtered samples. SEM analysis showed a variety of structures on the inner side of the filter membranes while the outside of the membrane did not show any changes compared to an unused control filter.

Conclusion

The point-of-use filters proved to be highly effective in eliminating potentially pathogenic Legionella and Fusarium species from the showering water. The effects were seen over the complete 5 week study period.

Disclosure of interest

None declared.