• Pao-Yuan Huang, Chien-Hung Chen, Mu-Jung Tsai, Chih-Chien Yao, Hsin-Ming Wang, Yuan-Hung Kuo, Kuo-Chin Chang, Chao-Hung Hung, Seng-Kee Chuah, and Ming-Chao Tsai.
• Division of Hepato-gastroenterology, Department of Internal Medicine, Kaohsiung Chang Gung Memorial Hospital, Kaohsiung 833, Taiwan.
• J Formos Med Assoc. 2023 Feb 1; 122 (2): 157163157-163.

Background/PurposeGut microbiology is associated with liver disease due to gut-liver circulation via the gut microbial-liver axis. There is a paucity of data regarding the effects of treatment to cure hepatitis C virus (HCV) infection on the gut microbiota. The aim of this study was to evaluate the fecal microbiota before and after treatment with direct antiviral agents (DAA) in patients with HCV infection.MethodsThis prospective study was conducted at Kaohsiung Chung-Gung Memorial Hospital, Taiwan, between December 2019 and November 2020. We recruited patients with chronic hepatitis C (CHC) receiving DAA treatment. Fecal samples were collected twice: at baseline (before DAA treatment; CHC group) and 24 weeks after the end of treatment (EOT; SVR24 group), and once from healthy controls at baseline (control group). The taxonomic composition of the gut microbiota was determined using 16 S ribosomal RNA gene sequencing of stool samples.ResultsA total of 60 patients with CHC and 60 healthy controls matched by age and gender were enrolled. All patients achieved a sustained virologic response (SVR). Alpha diversity was not significantly difference between any groups. Analysis of similarities (ANOSIM) revealed minor differences in the microbial community structure between the control group and CHC group (R = 0.0146, P = 0.098) and less significant differences between the CHC group and SVR24 group (R = -0.0139; P = 0.94). Three phyla and eight genera were differentially abundant between the control group and CHC group.ConclusionIndividuals with CHC do not exhibit significant gut microbiota alterations and eradication of HCV by DAA is not associated with significant modification of the gut microbiota.Copyright © 2022 Formosan Medical Association. Published by Elsevier B.V. All rights reserved.

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