Five pro-inflammatory cytokines were strongly induced by BCG vaccination: IFNγ (P < 0.0001) which had a median value of 1705 pg/ml in the vaccinated learn more group compared with 1.6 pg/ml in the unvaccinated group, TNFα (226 pg/ml vaccinated vs. 18 pg/ml unvaccinated, P < 0.0001), IL-2 (17 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated,

P < 0.0001), IL-1α (145 pg/ml vaccinated vs. 4 pg/ml unvaccinated, P < 0.0001) and IL-6 (855 pg/ml vaccinated vs. 227 pg/ml unvaccinated, P = 0.0003). There was also strong evidence that the pro-inflammatory cytokine IL-17 was induced by BCG vaccination (17 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated, P < 0.0001). There was strong evidence that three TH2 cytokines were also induced by BCG vaccination: IL-4 (10 pg/ml NVP-BGJ398 mouse vaccinated vs. 1.6 pg/ml unvaccinated, P = 0.013), IL-5 (7 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated, P = 0.0005) and IL-13 (104 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated, P < 0.0001). There was also strong evidence that the regulatory cytokine IL-10 was induced by BCG vaccination (96 pg/ml vaccinated vs. 8 pg/ml unvaccinated, P < 0.0001). Three

chemokines: IL-8 (20,562 pg/ml vaccinated vs. 1621 pg/ml unvaccinated, P = 0.0073), IP-10 (2122 pg/ml vaccinated vs. 99 pg/ml unvaccinated, P < 0.0001) and MIP-1α (454 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated, P < 0.0001) were induced by BCG vaccination. The growth factors G-CSF (21 pg/ml vaccinated vs. 1.6 pg/ml unvaccinated, P = 0.012) and GM-CSF (420 pg/ml vaccinated vs.

14 pg/ml unvaccinated, Mephenoxalone P < 0.0001) were also induced. There were six cytokines (IL-1β, IL-7, IL-12p70, IL-15, Eotaxin and MCP-1) for which there was no statistical evidence of a median difference between responses in vaccinated and unvaccinated infants, and (with the exception of Eotaxin) the median responses were either very similar in the two groups or higher in the unvaccinated group ( Table 1). Correlations between cytokines where there was evidence of a difference between vaccinated and unvaccinated infants were examined by Spearman’s rank correlation, among the vaccinated group (Table 2). Eight out of 14 cytokines correlated moderately strongly or strongly with IFNγ, and ten correlated with TNFα. IFNγ and TNFα correlated strongly with each other (r = 0.8). IFNγ and TNFα correlated with pro-inflammatory cytokines such as IL-2 with IFNγ (r = 0.6) and IL-2 with TNFα (r = 0.6) and IL-6 with IFNγ (r = 0.8), but also with TH2 cytokines such as IL-13 with IFNγ (r = 0.7) and IL-5 with IFNγ (r = 0.6). IFNγ and TNFα also correlated with chemokines and growth factors, for example IFNγ with IL-8 (r = 0.8) and IFNγ with GM-CSF (r = 0.8) ( Fig. 2).