FIFY
*Assuming your definition of immunity comes after 60 million people have become infected with a mere 1% fatality rate which would result in the needless deaths of 600,000 people.
Yes, I'm sure Italy won't be "minding" much... fuck me...
Sardinia may not be comparable to NZ's situation. One area (of many) you'd need to look carefully at is the testing stats in order to determine whether the virus situation is similar.
Fortunately Wikipedia has Sardinia data alongside NZs. https://en.wikipedia.org/wiki/COVID-19_testing...