In order to investigate the prevalence of HEV infection among blood donors,a cluster sampling strategy was used to sample all blood donors from July to August in 2002 in Beijing.

Methods The 620 blood specimens were detected for TTV DNA and TTV IgG by PCR and ELISA,including 512 specimens from normal blood donors,60 HBsAg positive specimens and 48 anti HCV positive specimens.

Method The investigated objects were selected from the groups of blood donors, normal people, patients with acute or chronic virus hepatitis and those with cirrhosis of liver (LC) or with primary hepatocarcinoma (PHC).

Detection of TT virus and sequence analysis of partial gene of TTV in sera from blood donors;

Study on sero-indexes among 2?690 qualified blood donors;

Seroepidemiological study of hepatitis G virus infection in blood donors;

Analysis of ELISA and Realtime-PCR screening blood donators HBV infection;

Diagnoses and Analysis the state of infectious disease about blood of the Paid blood donor in Taian City;

Retrospective study on acquired immunodeficiency virus mother-to-child and father-to-child transmission among the families with HIV-infected former paid blood donors in China;

Objective To study the impact of blood bank management,blood component and other related factors on getting HIV infection among former paid blood donors in China.