Effectiveness of COVID-19 Vaccines in the General Population of an Italian Region before and during the Omicron Wave
We performed a cohort analysis of the entire population of Abruzzo, Italy, to evaluate the real-world effectiveness of SARS-CoV-2 vaccines against infection, COVID-19 hospitalization or death, over time and during the Omicron wave.All resident or domiciled subjects were included, and official vaccination, COVID-19, demographic, hospital and co-pay