Cohort study finds differences in healthcare-seeking behaviour linked to COVID-19 testing and vaccination status, suggesting potential biases.
Findings from this Dutch-population-based cohort suggest that GP consultations between March 2022 and May 2023 may have differed by self-test result and vaccination status, indicating that selection bias in the TND COVID-19 VE estimates from testing before GP consultation could be a valid concern. More research in various settings is needed.
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Hagen et al. (2026) studied this question.
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