FIG. 5.

Immunohistochemical examination of brain sections from mice infected with PRV-Becker and PRV-Bartha. Equivalent anti-PRV stained sections of the hindbrain (A), caudal midbrain (B), and rostral midbrain (C) of mice infected with PRV-Becker at 75 h (moribund stage), PRV-Bartha at 77 h, and 166 h (moribund stage) are shown. Black and white image colors were reversed by using Adobe Photoshop software, and so the viral antigen appears as white. The regions demarcated by rectangles are shown enlarged in Fig. 6.