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Correction is envisioned for stochastic dependence between the survey's response rate and spatial COVID\u201019 incidence, commonly known as preferential sampling, but not found significant. Results show that an online survey can provide valuable auxiliary data to optimize spatial COVID\u201019 incidence estimation based on confirmed cases in situations with limited testing capacity. Furthermore, it is shown that an online survey on COVID\u201019 symptoms with a sufficiently large sample size per spatial entity is capable of pinpointing the same locations that appear as test\u2010confirmed clusters, approximately 1 week earlier. 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