Wastewater-based surveillance of microbial pathogens in GCC countries (2015-2025): a scoping review and questionnaire survey with stakeholders.

Background: Wastewater-based surveillance (WBS) of microbial pathogens has become an increasingly useful approach to monitor public health at the population level. However, these efforts varied widely in scope, methodology and focus within the GCC region. It remains unclear how WBS is being used across the region, and to what extent it can inform decision-making or contribute to long-term surveillance infrastructure within the GCC. This review aimed to critically assess WBS studies conducted across GCC and to provide perspective on how to further strengthen the ability of WBS to inform and provide early detection on the emergence of health concerns arising from microbial contaminants that are circulating in the community. Methods: This review was conducted following the PRISMA extension for scoping reviews guidance, aiming to identify and critically evaluate peer-reviewed studies that applied WBS across GCC between January 2015 and October 2025. A structured English-language literature search was carried out on the Web of Science, Scopus, and Google Scholar. Search results were screened against predefined inclusion and exclusion criteria. A survey was conducted with GCC stakeholders involved in the execution of wastewater surveillance, and their responses were studied to align actual WBS activities against that reported in the literature. Results: A total of 26 studies met the inclusion criteria for this review, with uneven distribution of studies published across the GCC countries ( Conclusion: Although WBS holds significant promises to enhance public health surveillance in the GCC, its potential remains underutilized. Moving forward, addressing capacity training and providing sustainable long-term funding mechanisms, standardizing methodological differences and/or providing a guideline that detail the best practices, promoting a consortium-based surveillance system and initiating research that can facilitate the utilization of WBS data to inform decision-making processes would be crucial for the successful integration of WBS into the region's public health framework.