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. 2022 Mar 8;88(5):e01740-21. doi: 10.1128/aem.01740-21

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FIG 2 — Use of Amicon centrifugal filters to increase sensitivity of the GeneXpert SARS-CoV-2/Flu/RSV assay. (A) The effect of centrifugal filtration on GeneXpert C_T values. Left white bars show C_T values without the use of centrifugal filters; right gray bars show values with the use of centrifugal filters. (B) Quantification of SARS-CoV-2 concentration in wastewater using centrifugal filters and GeneXpert standard curve (light gray) compared to results from laboratory-developed solids assay (dark gray). TAB, Toronto Ashbridges Bay; THC, Toronto Highland Creek; THU, Toronto Humber; VLG, Vancouver Lions Gate; VLI, Vancouver Lulu Island; VNL, Vancouver Northwest Langley; YK5, Yellowknife lift station 5 (multiple time points).