Hepatitis C Virus (HCV) genotypes distribution in South-Eastern Tuscany: a ten-year retrospective study.

Italy is recognized as having the highest Hepatitis C virus (HCV) prevalence in Europe. The Tuscany region, where the prevalence of HCV infection is approximately 0.8%, implemented two programs for the control of chronic hepatitis C in Tuscany from 2018 to 2022. This retrospective study aims to investigate the incidence of HCV in a population screened in Southeastern Tuscany from 2013 to 2022. The study population included 246,137 patients from the provincial area of Arezzo and Grosseto, Tuscany, spanning from January 2013 to October 2022. Among the subjects included in the study, 3,190 (1.29%) tested positive for anti-HCV antibodies. Of this population, 2,119 patients (66.43%) also tested positive for HCV-RNA quantification, leading to their enrolment for subsequent viral genotyping. 1,106 patients had genotype (GT) 1 (52.2%), 484 had GT 3 (22.8%), 371 had GT 2 (17.5%), and 158 had GT 4 (7.5%). Our study underscores the prevalence of HCV GTs 1 and 3 as the most predominant GTs in the Southeast Tuscany region. We also observe a correlation between age, sex and HCV genotypic distribution.