FIG 1.

SARS-CoV-2 concentration in Canadian wastewater samples and GeneXpert rapid test results. SARS-CoV-2 concentration was determined using a laboratory-developed, solids-based extraction and RT-qPCR test targeting N1 and N2. Value shown is the average of N1 and N2 targets. For a subset of samples, SARS-CoV-2 concentration was measured in the liquid fraction with a laboratory-developed test. Locations listed multiple times refer to unique samples collected on different days. All 15 samples on the far right of the graph (negative for SARS-CoV-2) were collected from communities with no active SARS-CoV-2 cases. GeneXpert results are either positive (+), weakly positive as determined by endpoint fluorescence (w), or negative (−). EGB, Edmonton Goldbar; HAD, Halifax Dartmouth; HHA, Halifax Halifax; HMC, Halifax Millcove; MMN, Montreal North; MMS, Montreal South; TAB, Toronto Ashbridges Bay; THC, Toronto Highland Creek; THU, Toronto Humber; TNT, Toronto North Toronto; VAI, Vancouver Annacis Island; VII, Vancouver Iona Island; VLG, Vancouver Lions Gate; VLI, Vancouver Lulu Island; VNL, Vancouver Northwest Langley; YK5, Yellowknife lift station 5; YK6, Yellowknife lift station 6; HR, Hay River; FSM, Fort Smith; FSI, Fort Simpson; IN, Inuvik; INT, institutional sample; NW, Norman Wells sewer.