Transcript Basic & Clinical immunology, 2nd year Clinical Laboratory

CD4+
CD4+
CD8+
Lymph node
Naïve T cells can live
for many years
3-5 days 3 times/day
>10000 folds
Immunity to extracellular bacteria
Immunity to intracellular bacteria
Bacteria in the cytosol activate CTLs against bacteria-infected
cells
Immunity to viruses
The defense mechanisms used to clear a primary infection are identified by the
red shading of the boxes where these are known. Yellow shading indicates a role
in protective immunity. Paler shades indicate less well established mechanisms.