Outbreaks of Virulent Infectious Bursal Disease in Flocks of Battery Cage Brooding System of Commercial Chickens

Figure 4

Photomicrographs of 4.3-week-old chicks affected with infectious bursal disease showing moderate lymphocytes depletion in the lymphoid nodules (yellow arrows) of the spleen (a), marked interfollicular oedema (black arrow), and cystic cavitation and necrosis (blue arrows) in the medullar of bursal follicles (b). H & E ×200.

(a)

(b)