Olfactory bulb immunohistochemical findings.

<p>Immunohistochemical findings in the olfactory bulb of mice exposed SC (A, C, E; left side) or by aerosol exposure (B, D, F; right side). (A) Immunonegative cells of the glomerular layer on day 4 PI in a SC exposed mouse, 40×. (B) Immunoreactive cells of the glomerular layer on day 4 PI in an aerosol exposed mouse, 40×. (C) Immunonegative cells of the olfactory bulb (inset depicts the glomerular layer, 40×) on day 7 PI in a SC exposed mouse, 2×. (D) Strongly immunoreactive olfactory neural cells (inset depicts immunoreactive neurons of the glomerular layer, 40×) on day 7 PI in an aerosol exposed mouse, 2×. (E) Moderate amounts of viral antigen in the glomerular layer on day 8 PI in a SC exposed mouse, 40×. (F). Intensely immunoreactive cells in the glomerular layer on day 8 PI in an aerosol exposed mouse, 40×.