Fig. 5From: Interaction between avian influenza subtype H9N2 and Newcastle disease virus vaccine strain (LaSota) in chickensa Spleen of G1 birds showed absence of lymphoid follicle (arrow). H&E, X 200; b Spleen of birds in G4 (non-vaccinated and H9N2-infected) showed decrease of lymphoid follicle (arrowhead). H&E, X 200; c Spleen of birds in G6 showed normal lymphoid follicle. H&E, X 200Back to article page