IL6 and tuberculosis: The results demonstrated that the animals which have had contact with PCV-2 and had been vaccinated, manifested a significant decrease in gene expression of proinflammatory cytokines, like interleukin 1 beta, interleukin 6, and tumour necrosis factor-alpha, possibly related with the severity of TB lesions, and also a significant decrease of interleukin 10, a key cytokine.