Figure 8.15.

Mycoplasma hyopneumoniae infection (enzootic pneumonia) in the lungs of a wild boar.

(A) Infection causes bronchopneumonia with consolidation that often has a cranioventral pattern. Affected parenchyma will be firm, often discolored dark red, and demarcation between affected and less or unaffected adjacent tissue may be apparent. (B) Infection is airway oriented and regionally, the airways and the alveolar interstitium contain numerous inflammatory cells. Bronchial associated lymphoid tissue is hyperplastic. With chronicity, the severity of infection increases.

(Photos Courtesy of the Centre for Fish and Wildlife Health, University of Bern)