title: [Detection of core antigen of hepatitis virus C in patients infected with hepatitis virus C and B].
abstract: OBJECTIVE
  To observe the effect of hepatitis virus B on the detection rate of core antigen of hepatitis virus C in sera of chronic hepatitis C patients.
  
  
  METHODS
  HCVcAg and HCV RNA in sera were detected in 88 patients with chronic hepatitis C and 62 patients co-infected with HCV and HBV. At the same time, HBV DNA and HBeAg in sera were detected in 62 patients infected with HCV and HBV. Then we analyzed the correlation between HCVcAg and HBeAg/HBV DNA. The detection rates of HCVcAg in 88 patients with chronic hepatitis C and 62 patients co-infected with HCV and HBV were 72.7% (64/88) and 38.7% (24/62), respectively (x2 = 17.358, P less than 0.01).
  
  
  RESULTS
  The detection rates of HCV RNA in 88 patients with chronic hepatitis C and 62 patients co-infected with HCV and HBV was 81.8% (72/88) and 53.2% (33/62)respectively (x2=20.110, P less than 0.01). In 62 patients infected with HCV and HBV, the detection rate of HCVcAg in HBeAg positive patients and HBeAg negative patients were 28.6% (12/42) and 60% (12/20), respectively (x2 = 7.547, P = 0.011). Moreover, the positive rates of HBV DNA in HBeAg positive patients and HBeAg negative patients were 42.9% (18/42) and 80% (16/20), respectively (P more than 0.05). The detection rates of HCVcAg in HBV DNA positive patients and HBV DNA negative patients were 39.1% (18/46) and 37.5% (6/16), respectively (x2 = 0.013, P = 0.908). Compared with the detection rates of HCVcAg in patients only infected with HCV, the detection rate of HCVcAg in HBeAg or HBV DNA negative patients infected with HCV and HBV were 60% (12/20) (x2 = 1.266, P = 0.261) and 37.5% (6/16) (x2 =7.635, P less than 0.01), respectively.
  
  
  CONCLUSIONS
  The detection rate of HCVcAg in patients infected with HCV and HBV is relatively low. The reason is possibly that HBeAg inhibits duplication of HCV and decreases the expression of HCVcAg.
authors.affiliation: Department of Infectious Diseases, SUN Yat-Sen University, Guangzhou, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Cao
authors.forename: Ka
authors.initials: K
authors.lastname: Zhang
authors.forename: Xin
authors.initials: X
authors.lastname: Shu
authors.forename: Qi-huang
authors.initials: QH
authors.lastname: Xu
authors.forename: Gang
authors.initials: G
authors.lastname: Li
mesh_terms: D060085:Coinfection / Q000276:immunology / Q000821:virology*; D004279:DNA, Viral; D016174:Hepacivirus / Q000276:immunology*; D006509:Hepatitis B / Q000276:immunology / Q000821:virology; D006515:Hepatitis B virus; D018936:Hepatitis C Antigens / Q000097:blood*; D019698:Hepatitis C, Chronic / Q000276:immunology* / Q000821:virology; D006801:Humans
chemical_list: D004279:DNA, Viral; D018936:Hepatitis C Antigens