诊断( Laboratory Diagnosis a Acute infection is diagnosed by the detection of HAV-Igm in serum by eia a Past Infection i.e. immunity is determined by the detection of hav-Igg by ela诊断（Laboratory Diagnosis） ◼ Acute infection is diagnosed by the detection of HAV-IgM in serum by EIA. ◼ Past Infection i.e. immunity is determined by the detection of HAV-IgG by EIA