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

Figure 1

Gross necropsy findings of challenged piglets. (a)–(d) Fibrinous layers on serosal surfaces in enterocoelia, thorax, pericardium, and articular cavity from nonvaccinated pigs. (e) and (f) Lesions in thorax and enterocoelia from immunized pigs.