Fig 2. Spleen cell IFN-γ production in response to M. avium culture filtrate (5 μg/mL) in BALB/c mice infected for 5 weeks (filled bars) or 20 weeks (striped bars) with the different Mah isolates.

Results represent mean IFN-γ levels (pg/mL) ± SEM of 3–5 mice tested individually. Statistical significance is depicted for each human or porcine strain as compared to respectively Hu91 or Po91 (*: p<0.05). N.A.: not available.