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Porcine interleukin-6 gene and CpG sequences were used as immunoadjuvants to enhance the immune responses of newborn piglets to Pseudorabies attenuated vaccine (PAV). The titer of specific antibodies to PAV, the proliferation of lymphocytes and induced IL-2 activities were all examined to identify the immune response of the piglets. The results showed that the immune responses with CpG ODN and porcine interleukin-6 gene were significantly stronger than routine immunities. The data suggests that porcine IL-6 and CpG motifs could be employed as effective immunoadjuvants to raise the humoral and cellular responses of newborn piglets to Pseudorabies attenuated vaccine. [ABSTRACT FROM AUTHOR]