When followed up as long as 13 and 24 months, anti-HAV-IgG was tested again by EIA competition inhibition assay marked by WHO standard sample (100mIU/ml).

• 检测用酶免疫测定(EIA)竞争抑制法,用世界卫生组织 (WHO)提供的标准品(含100mlU/ml)进行标定。