Underreporting of SARS-CoV-2 infections during the first wave of the 2020 COVID-19 epidemic in Finland-Bayesian inference based on a series of serological surveys.

The median age of COVID-19 cases in the HUS area showed a decreasing trend during spring 2020, most likely due to the increase in testing capacity, allowing detection of milder disease cases ( S7 Fig ).

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While there may be significant delays from SARS-CoV-2 infection until developing detectable antibodies, i.e. until seroconversion, symptoms and diagnosis of COVID-19 usually occur with less delay.

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