Whole campus wastewater surveillance of SARS-CoV-2 for COVID-19 outbreak management

Abstract

In this long-term study (eight months), a wastewater-based epidemiology program was initiated as a decision support tool for the detection and containment of COVID-19 spread in the Technion campus. The on-campus students' accommodations (∼3,300 residents) were divided into housing clusters and monitored through wastewater SARS-CoV-2 surveillance in 10 manholes. Results were used to create a ‘traffic-light’ scheme allowing the Technion's COVID-19 task force to track COVID-19 spatiotemporal spread on the campus, and consequently, contain it before high morbidity levels develop. Of the 523 sewage samples analysed, 87.4% were negative for SARS-CoV-2 while 11.5% were positive, corroborating morbidity information the COVID-19 task force had. For 7.6% of the SARS-CoV-2 positive samples, the task force had no information about positive resident/s. In these events, new cases were identified after the relevant residents were clinically surge tested for COVID-19. Hence, in these instances, wastewater surveillance provided early warning helping to secure the health of the campus residents by minimising COVID-19 spread. The inflammation biomarker ferritin levels in SARS-CoV-2 positive sewage samples were significantly higher than in negative ones. This may indicate that in the future, ferritin (and other biomarkers) concentrations in wastewater could serve as indicators of infectious and inflammatory disease outbreaks. HIGHLIGHTS SARS-CoV-2 in-sewer monitoring was used as a decision support tool for minimising COVID-19 spread in the Technion.; Of the positive sewage samples, 91% corroborated diagnosed cases and 7.6% served as an early warning since no positive cases were known.; No false-positive/negative results were obtained.; Ferritin, an inflammation biomarker, levels were significantly higher in positive sewage samples.; Sewer monitoring may make surge testing partially redundant;

Keywords

• covid-19
• disease management
• in-sewer surveillance
• metabolic marker
• sars-cov-2
• wastewater-based epidemiology