Abstract: Objective: To present a prevalence study in prisons and estimate the percentage of people deprived of liberty, health professionals and prison officers infected with SARS-CoV-2 in ES. Methods: this was a prevalence study with sampling carried out in 34 prison units in ES, stratified between 08/31 and 09/04/2020, based on the Population-based age-stratified seroepidemiological investigation protocol fo...