RE: COVID-194 Apr 2020 17:39
April 3 (GMT)
Italy: the real number of COVID-19 cases in the country could be 5,000,000(compared to the 119,827 confirmed ones) according to a study which polled people with symptoms who have not been tested, and up to 10,000,000 or even 20,0000,000 after taking into account asymptomatic cases, according to Carlo La Vecchia, a Professor of Medical Statistics and Epidemiology at the Statale di Milano University.
This number would still be insufficient to reach herd immunity, which would require 2/3 of the population (about 40,000,000 people in Italy) having contracted the virus [source].
The number of deaths could also be underestimated by 3/4 (in Italy as well as in other countries) [source], meaning that the real number of deaths in Italy could be around 60,000.
If these estimates were true, the mortality rate from COVID-19 would be much lower (around 25 times less) than the case fatality rate based solely on laboratory-confirmed cases and deaths, since it would be underestimating cases (the denominator) by a factor of about 1/100 and deaths by a factor of 1/4.
https://www.worldometers.info/coronavirus/country/italy/