Fig. 3

Immunohistochemistry. a Iberian lynx. Cerebrum. Negative control for immunohistochemical PRV detection by substitution of the primary antibody with normal mouse serum (1:100). PDM. DAB chromogen. (bar = 40 μm). b PRV infected swine. Brain. Positive control for immunohistochemical PRV detection. PDM. DAB chromogen. (bar = 35 μm)