Methods: The epidemiological methods of serum and the enzyme linked immunosorbent assay (ELISA) were applied to examine the anti-HCV in the blood serum!of 250 drug users.

• 方法：采用血清流行病学方法，应用酶联免疫吸附法(ELISA)检测250例吸毒人群血清丙肝病毒抗体（抗-HCV）。