Memory T Lymphocytes Generated byMycobacterium bovisBCG Vaccination Reside within a CD4 CD44loCD62 LigandhiPopulation

Abstract
In the lungs of mice vaccinated withMycobacterium bovisBCG, there was an accumulation of CD4 cells expressing the activated effector phenotype CD44hiCD62 ligandlo(CD62Llo) which were capable of secreting gamma interferon. Upon cell transfer, however, cells expressing a resting/naïve phenotype (CD44loCD62Lhi) were capable of protecting the recipients from a virulent challenge infection, suggesting the emergence of T-cell memory from within this subset.