Protective Efficacy of an Inactive Vaccine Based on the LY02 Isolate against Acute Haemophilus parasuis Infection in Piglets

Figure 2

Histopathological examinations in various organs from nonvaccinated pigs. (A) Lung, interstitial pneumonia, inflammatory cells infiltration, alveolar sacs expansion, and alveolar exudate. (B) Liver, cells degeneration, sinus gap expansion, a fibrinous exudate, and focal necrosis foci. (C) Lymph, necrocytosis. (D) Spleen, fibrinous exudate in medullary sinuses, inflammatory cells infiltration, red pulp expansion, and white pulp atrophy. (E) Kidney, epithelial cells necrosis, and lumen with fibrinous exudate. (F) Heart, cardiac muscle fiber atrophy, and flat, myocardial fibers cytoplasm dissolution and fracture.