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Seroprevalence trends of anti-SARS-CoV-2 antibodies and associated risk factors: a population-based study
We aimed to assess the seroprevalence trends of SARS-CoV-2 antibodies in several Swiss cantons between May 2020 and September 2021 and investigate risk factors for seropositivity and their changes over time.We conducted repeated population-based serological studies in different Swiss regions using a common methodology. We defined three study periods: May-October …