Eight Good Reasons for Careful Monitoring and Evaluation of the Vaccine Campaign against COVID-19: Lessons Learned through the Lombardy Experience for Dealing with Next Challenges.

Table 3 shows that (i) as age increased, there was a clear trend towards decreasing the odds of infection and increasing odds of severe illness; (ii) male gender was a significant risk factor for severe illness; (iii) as the number of contacts with RHS increases, a trend towards increasing odds of both infection and severe illness was observed; (iv) previous history of SARS-CoV-2 infection and mRNA-based vaccination were significant protective factors against infection and severe illness.

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