“…SARS-CoV-2 RNA in sewage samples was also detected in the vicinity of the COVID-19 isolation centre in south-eastern Bangladesh ( Ahmed et al, 2021 ). Quantifying the concentration of viruses in wastewater could serve as a proxy for monitoring disease transmission among the population, which is an approach termed as âwastewater-based epidemiologyâ (WBE) ( Ahmed et al, 2020 ; Aguiar-Oliveira et al, 2020 ; Bhattacharya et al, 2021 ; Buonerba et al, 2021 ; Gwenzi, 2022 ; Huisman et al, 2022 ; Islam et al, 2023b ; Lodder et al, 2013 ; Wu et al, 2020a ; Zhang et al, 2020b ). In fact, SARS-CoV-2 RNA concentration in the wastewater and hospital effluent samples correlated with the number of reported COVID-19 cases in different countries ( Majumder et al, 2021 ).…”