5) Listeria monocytogenes in direct smear of the pons (Gram staining).

6) Perivascular infiltration consisting macrophages and micro-abscess in the medulla (HE staining).

7) Colonies of L.monocytogenes (on tellurite brain heart infusion agar incubated at 37°C for 48 hrs).

8) Bacteria of L.monocytogenes(Gram staining).