Statement

The Italian government has successfully started its vaccine campaign against COVID-19 but is having some troubles after the injections of the second dose have begun. To protect patients' privacy, the only piece of information collected after the vaccination is an anonymous identifier stored in a database that is supposed to uniquely identify a person through the whole process. This means that at the current point we have a list with N_1 identifiers assigned to people who have been vaccinated with the first dose, and another shorter list with N_2 identifiers assigned to those who have also been vaccinated with the second shot. Being in a rush, some centers made some mistakes in assigning the proper identifiers when administering the second dose. These errors make it very hard to produce reliable statistics about the number of people fully vaccinated with both doses, but Luca offered himself as a consultant for the government to help...