Fig. 4

Effects of QG on post-vaccination immune organ responsiveness in chickens. A–D Thymus index (A), spleen index (B), bursa index (C), and change of body weight (D) in chickens receiving no vaccination (Control), NDV-IV vaccination only (Model), or NDV-IV vaccination followed by 5 days of treatment with low-, medium-, or high-dose QG (QGL, QGM, and QGH, respectively)