Abbreviation: 95% CI, 95% confidence interval. *Note that zero events in a sample of 49 subjects still yields an upper 95% confidence limit of 0.073 for the 30-day incidence rate. †In addition to the
Background: Since February 2020 COVID-19 infection spread in Italy, violently hitting the Lombardy region. Despite high diffusion, only a subset of patients developed severe COVID-19: around 25% of th
