Figure 6From: Attenuated Salmonella typhimurium delivering DNA vaccine encoding duck enteritis virus UL24 induced systemic and mucosal immune responses and conferred good protection against challengeT lymphocytes in PBL following DEV UL24 DNA vaccination. 1, 2, 3, 4, 6, 8 weeks after vaccination, the isolated PBL were stained with monoclonal antibodies against duck CD4 (A) and CD8 (B). The results presented are the mean of all specimens of each group. Statistical significance was determined using a student’s t-test.Back to article page