Figure 3.

Production of tumour necrosis factor-α (TNF-α) (a) and interleukin-10 (IL-10) (b) in the lungs of mice infected with either low or high dose of attenuated and virulent Mycobacterium bovis strains at day 3 and day 7 post-infection. Control mice were inoculated with phosphate-buffered saline. Each bar represents the arithmetic mean ± SEM of six mice. Results are representative of two different experiments. *P< 0·05 versus non-infected control; ^#P< 0·05 versus infected with attenuated strain.