(TA97, TA98, TA1oo. Center for and TA102) were purchased from Shandong famide Disease Control and Prevention was obtained from a Chemicals Co. Louis. USA) (St. induced Atebrine, the primary by Arochlor 1254) and materials participated inthe test of RPMI immune response to SRBC(SRBC(sleep red blood cell 1640. Hank's buffer, alexin from cavy), and SA buffer) were offered by The Central Hospital of Taian, and other regents involved in this study were purchased fromlocal chemicals agencies.