What is the sensitivity of the method RT-PCR and current detection window for sewage surveillance?

Because genetic fragments are amplified through the polymerase chain reaction (PCR), RT-PCR can be consiered as a very sensitive method to demonstrate presence of SARS-CoV-2 genes. We are currently conducting further experiments to determine the extent to which the genes remain detectable in time under different (realistic wastewater) conditions, and try to link the strength of the signal to epidemiological data.