In the present study, serum IgG, IgA, IgM and C3, C4 levels have been measured as indicators of humoral immunity. Serum IL-2 as an important cytokine, plays a central role in the cell-mediated immune response (Pié et al., 2004) and has a broad-spectrum immune promoter activity that can induce the differentiation of T cell and B cell, promote the function of NK cell, release interferon and antivirus (Li et al., 2011).