Figure 5.
(a) Relative abundance (RA) of Legionella spp. in all samples under different water heater temperature settings (T in °C); (b) relative abundance (RA) of Legionella spp. in influent and control rig samples across time (t in month, mon). Relative abundance was calculated using Illumina 16S rRNA gene amplicon sequencing. Water use frequency and phase are indicated by color and shape, respectively. All influent samples were assigned a uniform temperature of 20 °C to facilitate comparison.