Fig. 2: Sorption of SARS-CoV-2 RNA to suspended solids and sewer biofilms.
From: Impact of sewer biofilms on fate of SARS-CoV-2 RNA and wastewater surveillance
a, Relationship of SARS-CoV-2 RNA concentrations between SS and wastewater liquid Css ~ Cl (blue filled circles. n = 11 independent replicates. Spearman correlation coefficient r = 0.80) and relationship of RNA concentrations between sewer biofilms and wastewater mixture Cbio ~ Cww (green unfilled circles,; n = 13 independent replicates, Spearman correlation coefficient r = 0.76) at equilibrium. Data are presented as mean values with standard deviation (s.d.). Log transformation data are fitted using linear regression in GraphPad Prism 8. b, Estimated sorption coefficients of SARS-CoV-2 RNA onto SS (Kd_ss, ml g−1) and onto biofilms (Kd_bio, ml cm−2) in sewer matrices of Chambers (blue filled circles, Kd_ss n = 4, Kd_bio n = 5, independent samples) and Reactor (green unfilled circles; Kd_ss n = 7, Kd_bio n = 8, independent samples). Sorption coefficients determined between Chambers and the Reactor showed significant difference, Kd_ss P = 0.006 and Kd_bio P = 0.01 (two-sided Mann–Whitney test). The box plots display median and extend from the 25th to 75th percentiles, with the upper whiskers extending to the 90th percentile and the lower whiskers extending to the 10th percentile. Data are provided in source data.
