Hepatitis Delta Virus Infection: Cross-sectional Study in Patients With Chronic Hepatitis B Virus Infection

The goal of this observational study is to determine the prevalence of hepatitis D virus (HDV) and the distribution of the HDV genotype in patients with chronic hepatitis B infection. It will also identify factors related to hepatitis D virus infection, such as characteristics of the study sample, vaccination history, drug use affecting hepatitis, family factors, environment, and lifestyle. This study will be conducted at Tam Anh General Hospital, Bach Mai Hospital and Tam Anh TP. Ho Chi Minh General Hospital. Participants will be interviewed directly through a questionnaire to collect some information related to epidemiological risk factors. A blood sample will also be collected.

Inclusion Criteria: * Patients ≥ 16 years old undergo testing at the Testing Center of Tam Anh General Hospital or Tam Anh TP. Ho Chi Minh General Hospital, with chronic hepatitis B HBsAg (+) standards for six months or over or HBsAg (+) combined with HBcAb total (+) and HBcAb-immunoglobulin M (-). * Patients ≥ 16 years old with chronic hepatitis B come to be examined or are inpatients at the Gastroenterology - Hepatobiliary Center of Bach Mai Hospital, diagnosed with hepatocellular carcinoma, and cirrhosis Exclusion Criteria: * Patients do not agree to participate in the study or refuse to sign a written informed consent.