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Table 3 Average total number of planktonic L. pneumophila gene copies in each reservoir during each sampling (for each sampling, n = 18 for distal taps; n = 2–6 for tank + recirc)

From: Water heater temperature set point and water use patterns influence Legionella pneumophila and associated microorganisms at the tap

   Baseline Exp. 1 Exp. 2 Exp. 3
System Reservoir (5 months) (8 months) (13 months) (15 months)
Control (always 39 °C) Distal taps (water) 5.01E + 07 3.02E + 07 1.02E + 08 2.17E + 08
Tank + recirc (water) 1.30E + 09 2.94E + 08 7.55E + 08 1.55E + 09
Experimental Distal taps (water) 5.60E + 07 5.92E + 06 2.44E + 07 4.98E + 06
Tank + recirc (water) 3.94E + 09 1.55E + 08 2.63E + 07 7.12E + 07
Control normalized to experimental 39 °C/39 °C 39 °C/42 °C 39 °C/51 °C 39 °C/58 °C
Total system L. pneumophila genes (water) 0.30 2.0 16.9 23.2
Tank + recirc L. pneumophila genes (water) 0.33 1.9 28.7 21.8
Distal tap L. pneumophila genes (water) 0.89 5.1 4.2 43.6