was not due to
a lack of a gp33 epitope-specific CD8 T-cell
response, as demonstrated by the data in Fig. 6B.
As measured
by an intracellular IFN- assay, PKO mice immunized with
rLm-gp33 had levels of spleen cells specific for gp33 (9.3% in
the assay shown in Fig.
6) similar to levels found in immunized
B6 mice (Fig. 4B and 6B).
This demonstrates that perforinmediated
mechanisms play a role in protection from infection
and disease.