The Immune functions were determined after the ratsandmice were given lead (08. 4 mmol/L)in their drinking water for 4 weeks. The results showed that primary antiSRBC antibody and primary immune response levels were significantly higher in low dose group than in control group ,while lower in high dose group. The secondary immune response had shown stronger inhibition in high dose group than that in low dose group.The dose-response and time-response relationships were observed in the effects of lead to the p...