Table 3.

Examples of studies where SARS-CoV-2 was detected in wastewater of targeted communities. The table shows the sampling period and location, number of samples and the main highlighs of each study.

Location	Period of sampling	Sampling location	Number of samples	Highlights	References
Ljubljana, Slovenia	June 1st to 15th, 2020	Hospital wastewater	15	•WBE is a useful approach for early warning in risk communities such as hospitals. •RNA increase was followed by an increase in COVID-19 patients.	[23]
Calgary, Canada	August 5th to December 17th, 2020	Hospital wastewater	159	•RNA increase was followed by an increase in COVID-19 patients.	[73]
Virginia, USA	Early 2020	Hospital wastewater; Student dormitories wastewater; WWTP	Not available	•WBE at individual buildings seems to be a feasible tool for SARS-CoV-2 surveillance in occupied congregate living settings.	[74]
Valencia, Spain	October 2020	Nursing homes wastewater	5	•SARS-CoV-2 sewage monitoring in combination with targeted screening of residents and staff can be a powerful tool for early detection of viral transmission and its spread at nursing homes.	[75]
Dubai, UAE	April 22nd to July 7th, 2020	Pumping stations; WWTPs; Aircraft wastewater	27 (Pumping stations); 2940 (WWTPs); 198 (Aircraft wastewater)	•Detection of SARS-CoV-2 in the wastewater of an aircraft may prompt decision-makers in any country to suspend all flights from a particular location.	[77]
Queensland, Australia	April 23th, 2020	Aircraft and cruise ship wastewater	21	•The surveillance of wastewater from large transport vessels containing their own wastewater tanks has the potential to complement and prioritize clinical testing and contact tracing among disembarking passengers.	[76]