Frequency of IFN-γ secreting cells in spleen and lung from BCG immunized mice following <i>M. bovis</i> challenge.

<p>Lymphocytes of the spleen (A) and lungs (B) from mice (n = 5) immunized six weeks previously with BCG or placebo were isolated prior to and post challenge with <i>M. bovis</i>. Following re-stimulation with antigen cocktail, cells were enumerated for IFN-γ production by ELISPOT. Symbols represent mean (±S.E.) spot forming units adjusted per 10⁶ cells. Un-paired student's two-sided <i>t</i> - test * ρ<0.05, ** ρ<0.01.