Fig. 2

H&E staining in the close tissue and distant tissue of BS patients.a1 Close lesion tissue showed degenerated cartilage tissue. Fibrous tissue and small blood vessel hyperplasia, a mass of inflammatory cells infiltration. Visible new cartilage tissue and no obvious granuloma structure (20x). a2 Distant normal tissue of BS patients (20x). b1 Demonstration by IHC of Brucella-Ab in Close lesion tissue. Many macrophages show a strong positive cytoplasmic immunostaining (20x). b2 Brucella-Ab IHC staining of the distant normal tissue of BS patients showed negative results (20x)