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This study surveyed Legionella in 805 samples taken from 18 hot water systems under operating conditions. The results were analyzed and discussed in relation to water temperature, legislative requirements and optimization of the systems. The temperature of most samples (71%) ranged from 45-60 degrees C. The highest levels of colonization by L. pneumophila were found at water temperatures from 30-35 degrees C. At temperatures above 50 degrees C there was a large decrease in the number ofpmid:19572483 fatcat:yd3vgjtxmnd2pf6ytnrszqpboe