Optimizing Wastewater Surveillance Sites for COVID-19 Hospitalization Forecasting Across U.S. States
Kaur, G.; Chen, J.; Adiga, A.; Adiga, A.; Espinoza, B.; Lewis, B.; Marathe, M.; Venkatramanan, S.; Warren, A.; Vullikanti, A.
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In this study, we analyze viral load data from wastewater treatment plants (WWTPs) across multiple U.S. states and address the challenge of selecting an optimal subset of sites to improve COVID-19 hospitalization forecasts. Using forward (greedy) regression with a baseline ARIMA model, we identify the most informative WWTPs that enhance forecast accuracy while reducing the number of sampling locations. Our analysis, based on NWSS data, shows that the optimal number of sites typically ranges from 2-8, though some states, including NY, IL, and WI, benefit from a larger set (10-20). We also leverage a Virginia-level digital twin model specifically designed for wastewater data modeling and analysis and our results show that for different parameter settings, that forecast accuracy can be achieved with strategically chosen small number of sites, providing
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