Figure 4.

SARS‐CoV‐2 abundance in hospital wastewater as a function of VOC‐related waves. SARS‐CoV‐2 RNA data from the Delta‐wave (i.e., mid‐August to end of November 2021) were compared with samples collected during Omicron‐wave (i.e., January 2022). (A) N1 SARS‐CoV‐2 RNA signal (copies/ml). (B) N1 SARS‐CoV‐2 genomic copies normalized relative to genomic copies of the fecal biomarker PMMoV. Median and interquartile ranges are indicated as the middle, top, and bottom lines of each box. Ends of the whiskers mark the lowest and highest signal determined in each category for each hospital analyzed. Differences were determined using the Mann–Whitney U test. VOC, variants of concern