Wastewater surveillance studies on pathogens and their use in public health decision-making: a scoping review

This study provides a comprehensive overview of wastewater surveillance studies on pathogens, identifies key characteristics of studies that are associated with public health actions, and highlights the actions resulting from these studies. Many studies refer to the value of wastewater surveillance in public health decision-making, but it remains unclear how many studies support public health action and whether this is incorporated into study designs. Therefore, we conducted a scoping review following PRISMA guidelines and used the machine learning tool ASReview to identify wastewater surveillance studies monitoring pathogen circulation in human populations, followed by correlational analyses. A total of 974 studies were included, of which only 84 described public health action. Merely 28 of these incorporated strategies to facilitate action within their study designs. Studies leading to public health action primarily monitored viruses, e.g., SARS-CoV-2 and poliovirus, and since 2024 also influenza A and B virus, respiratory syncytial virus, hepatitis A virus and mpox virus. Furthermore, studies conducted by public health institutes or targeting non-standard locations are more likely to result in action, whereas those with larger population sizes or focusing on residential areas are less likely to result in action. The most common public health actions included informing health authorities and identifying cases. Our findings highlight the value of learning from existing use cases. While wastewater surveillance can support public health actions, evidence of its use is limited. Future studies should improve study designs by, e.g., incorporating strategies for public health actions to maximize their effectiveness and impact on decision-making.