The highest MMP9-immunoreactivity is noticeable in pyramidal cell layer (PyrCL) of cornu ammonis of infected mice in the course of all infection (Figure 6c(A–C)) and also high in 8 postinfection day of immunosuppressed mice (Figure 6c, D); control groups of mice the immunosuppressant treatment result in rise of MMMP9 immunoexpression (Figure 6c(J–L)) in comparison to control, untreated animals (Figure 6c(G–I)). Here, MMP9 is linked to infection.