We analyzed 5,484 close contacts of COVID-19 cases from Italy, all of them tested for SARS-CoV-2 infection. We found an infection fatality ratio of 2.2% (95%CI 1.69-2.81%) and identified male sex, age >70 years, cardiovascular comorbidities, and infection early in the epidemics as risk factors for death.
@article{arxiv.2007.04381,
title = {Infection fatality ratio of SARS-CoV-2 in Italy},
author = {Piero Poletti and Marcello Tirani and Danilo Cereda and Filippo Trentini and Giorgio Guzzetta and Valentina Marziano and Sabrina Buoro and Simona Riboli and Lucia Crottogini and Raffaella Piccarreta and Alessandra Piatti and Giacomo Grasselli and Alessia Melegaro and Maria Gramegna and Marco Ajelli and Stefano Merler},
journal= {arXiv preprint arXiv:2007.04381},
year = {2022}
}