  Estimation of prevalence of undocumented SARS-CoV-2 infections is critical
for understanding the overall impact of the Covid-19 disease. In fact,
unveiling uncounted cases has fundamental implications for public policy
interventions strategies. In the present work, we show a basic yet effective
approach to estimate the actual number of people infected by Sars-Cov-2, by
using epidemiological raw data reported by official health institutions in the
largest EU countries and USA.
