FIG. 3. Time course of CDV dissemination in different tissues. Shown are a macroscopic visualization of infection in the olfactory bulb (A to D), a transverse section of a lung lobe (E to H), and Peyer's patches (panels I to L). The contours of the organs are outlined by a white line. (A, E, and I) Normal light photographs of the different tissues from an animal sacrificed at 14 d.p.i. (B, F, and J) Same organs and time point as above but photographed after EGFP fluorescence excitation. Also shown are the same organs as above from an animal sacrificed at 21 d.p.i. (C, G, and K) and at the time of euthanasia (D, H, and L), photographed after EGFP fluorescence excitation.