The patient is puzzled that "HbsAb positive" still suffers from hepatitis B, and thinks that "HBsAb positive will not get hepatitis B". As far as we know, many doctors who are not specialized in liver diseases do not fully understand the relationship between hepatitis B surface antibody and prevention of hepatitis B. In order to improve the level of scientific prevention and treatment of hepatitis B and protect people's health, the author consulted domestic and foreign literatures and answered them to help prevent and treat hepatitis B scientifically. First of all, understand the knowledge of "two halves of hepatitis B". The two halves of hepatitis B refer to hepatitis B virus surface antigen (HBsAg), hepatitis B virus surface antibody (HBsAb), hepatitis B virus E antigen (HBeAg), hepatitis B virus E antibody (HBeAb) and hepatitis B virus core antibody (HB-cab). In the process of clinical examination, there are several combinations of HBsAb positive: 1, HBsAb positive. 2.HBsAb positive, HBeAb positive, HBcAb positive; HBsAb positive, HBcAb positive; HBsAb positive, HBeAb positive. 3, HBsAb positive, HbsAg positive. The above results will be discussed separately below. 1, HBsAb positive hepatitis B virus infection recovery period, or immunization after vaccination with hepatitis B vaccine. Modern research has confirmed that the ability of HBsAb positive to prevent virus infection is related to the titer: 100- 1000IU/L can provide10.5 years protection, and 1000- 1000 iu/L can provide 3 years protection, >/. 2.HBsAb positive, HBeAb positive, HBcAb positive; HBsAb positive, HBcAb positive; Recovery period of HBsAb positive and HBeAb positive hepatitis B virus infection. At this stage, due to human immunity, hepatitis may occur, and even liver failure may occur. Some people stay the same all their lives. 3. After inoculation of HBsAb-positive and HbsAg-positive standard vaccines, patients infected with variant virus strains or different subtypes of hepatitis B virus are no different from hepatitis B virus infection, which requires close observation and standardized treatment. In short, even if HBsAb is positive, we should not take it lightly. It is still necessary to observe closely and inject hepatitis B vaccine regularly to improve the effect of disease prevention. According to different test results, HBV-DNA, liver color Doppler ultrasound, liver biopsy and immunohistochemical detection are needed. In this regard, you need the professional guidance of experts to protect your health. Expert profile Director Tan, director of infectious diseases teaching and research section, professor/chief physician, tutor of master students, one of the leaders of internal medicine in Hubei Province, and the editorial board of Journal of Hubei Medical College. Enjoy the provincial government allowance and the municipal government special allowance. Presided over 10 key scientific and technological projects in provinces and cities. Obtained 10 provincial certificate of major achievements. Won the third prize of provincial scientific and technological progress 1 and the fourth prize of municipal scientific and technological progress. Published 78 papers in national core journals. He is good at the diagnosis and treatment of viral liver disease, fatty liver and hyperlipidemia. Expert Clinic: Saturday, Li Jinke, 1 Deputy Director and Director of Ward. Expert clinic: Tuesday, Li Fang, deputy director of the department and director of the second ward. Expert clinic: On Monday, Zhan Guoqing, deputy director and chief physician of Institute of Hepatology. Expert clinic: Thursday, Deputy Chief Physician Li Gang. Expert clinic: Tuesday, deputy director of Du Keke. Expert clinic: on Wednesday, Li, head of the fever clinic of the hospital infection department. Expert Clinic: Xie Xingrong, Associate Professor/Deputy Chief Physician on Saturday. Expert Clinic: Monday, Zhang Weiwei, Associate Professor/Deputy Chief Physician. Expert clinic: Wednesday, Paul Hu, deputy chief physician/associate professor. Expert clinic: On Tuesday, Ren Yongsheng, deputy director of Institute of Hepatology, doctor, associate professor.