Dr. Prevost will first present the results of several recommissioning case studies showing that not all buildings are contaminated with Legionella after extended stagnation and that other OPPs should be considered. Then she will show findings from a detailed intervention study to measure the impact of dally, weekly and monthly flushing and shook chlorination on the prevalence and concentrations on Legionella pneumophilia in a heavily contaminated large building.

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