City-level SARS-CoV-2 sewage surveillance

Area of Science:

• Environmental Science
• Epidemiology
• Public Health

Background:

• The COVID-19 pandemic necessitates innovative disease surveillance methods.
• SARS-CoV-2 RNA is detectable in wastewater, suggesting its potential for monitoring.
• Wastewater surveillance offers an efficient tool for epidemiological tracking and early warning.

Purpose of the Study:

• To assess the feasibility of wastewater monitoring for SARS-CoV-2 surveillance.
• To develop a method for quantifying viral RNA in urban wastewater.
• To evaluate wastewater monitoring as an early warning system for COVID-19 outbreaks.

Main Methods:

• Sampling of urban wastewater infrastructure in Ashkelon, Israel.
• Detection and quantification of SARS-CoV-2 RNA in wastewater samples.
• Development of a Normalized Viral Load (NVL) index to assess virus activity.

Main Results:

• SARS-CoV-2 RNA was detected in wastewater samples from multiple locations.
• The Normalized Viral Load (NVL) index showed varying levels of virus activity.
• An increase in viral load preceded a clinically apparent rise in COVID-19 morbidity by 2-4 weeks.

Conclusions:

• Wastewater monitoring is a viable tool for epidemiological surveillance of SARS-CoV-2.
• The NVL index can indicate population-level virus activity and predict future outbreaks.
• This methodology offers a proactive approach to managing public health during pandemics.