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Mycobacterium avium Complex in Day Care Hot Water Systems, and Persistence of Live Cells and DNA in Hot Water Pipes

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Abstract

The Mycobacterium avium complex (MAC) is a group of opportunistic human pathogens that may thrive in engineered water systems. MAC has been shown to occur in drinking water supplies based on surface water, but less is known about the occurrence and persistence of live cells and DNA in public hot water systems based on groundwater. In this study, we examined the occurrence of MAC in hot water systems of public day care centers and determined the persistence of live and dead M. avium cells and naked DNA in model systems with the modern plumbing material cross-linked polyethylene (PEX). The occurrence of MAC and co-occurrence of Legionella spp. and Legionella pneumophila were determined using cultivation and qPCR. Co-occurrences of MAC and Legionella were detected in water and/or biofilms in all hot water systems at temperatures between 40 and 54 °C. Moderate correlations were observed between abundance of culturable MAC and that of MAC genome copies, and between MAC and total eubacterial genome copies. No quantitative relationship was observed between occurrence of Legionella and that of MAC. Persistence in hot water of live and dead M. avium cells and naked DNA was studied using PEX laboratory model systems at 44 °C. Naked DNA and DNA in dead M. avium cells persisted for weeks. Live M. avium increased tenfold in water and biofilms on PEX. The results suggest that water and biofilms in groundwater-based hot water systems can constitute reservoirs of MAC, and that amplifiable naked DNA is relatively short-lived, whereas PEX plumbing material supports persistence and proliferation of M. avium.

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Acknowledgments

We thank Margit Paulsen for providing technical assistance and Associate Professor Niels Iversen for helpful discussions. This work was supported by the Danish Council for Strategic Research; the project SENSOWAQ—Sensors for Monitoring and Control of Water Quality; and by grants from the Obel Family Foundation.

Conflict of interest

The authors declare that they have no conflict of interest.

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  1. Section of Biology and Environmental Science, Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngaardsholmsvej 57, 9000, Alborg, Denmark

    Annette S. Bukh & Peter Roslev

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  1. Annette S. Bukh
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Correspondence to Peter Roslev.

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Bukh, A.S., Roslev, P. Mycobacterium avium Complex in Day Care Hot Water Systems, and Persistence of Live Cells and DNA in Hot Water Pipes. Curr Microbiol 68, 428–439 (2014). https://doi.org/10.1007/s00284-013-0493-4

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