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. 2022 Jan 14;212:118070. doi: 10.1016/j.watres.2022.118070

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© 2022 The Authors. Published by Elsevier Ltd.

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Fig 1 — SARS-CoV-2 RNA copy numbers in Massachusetts wastewater and new clinical cases. Seven-day averages of wastewater viral copy numbers (blue) and new clinical cases reported for the three counties in the catchment (orange). We marked major holidays (top), major social events (middle), and state reopening phases (bottom) in the three panels, respectively (Baker, 2021a, p. 2, C.D. 2021b, C.D. 2020a, C.D. 2020b, 2020c, 2020d, 2020e, 2020f, n.d.). Black arrows indicate peaks in wastewater SARS-CoV-2 RNA copy numbers that were not reflected in clinical case counts.