Figure 6.
Stimulation of increased CNS immune infiltration and activation of LCMV-memory CTL by infection with a second virus not encoding LCMV gene products. An MBP–NP transgenic positive mouse was infected with LCMV followed by VV infection 6 wk later. After another 6 wk, the mouse was sacrificed and increased numbers of CD8+ (A) and CD4+ (B) cells compared with those observed after a single LCMV infection were detected in the brain by immunohistochemical staining as described in Materials and Methods. Bar, 200 μm; original magnification ×100.