Immunohistochemical analysis of C57BL/6 mouse brains 1 day post intratumoral infection with LIVP 1.1.1 (Figure 2e, h) or PBS as control (Figure 2d, g) revealed a strong infiltration of the tumor with microglia (Iba-1+) and astrocytes (GFAP+) at both treatment conditions. Here, GFAP is linked to infection.