Fig. 3.

IBDV infection (48 hpi) causes greater T cell infiltration within the bursa of IBDV susceptible (RIR) than resistant (15l) infected birds. Sectioned BF of resistant 15l (A) and susceptible RIR (B) stained with the pan T cell marker, CD3 (red), and DAPI (blue) used for counterstaining double stranded DNA. Individual bursal follicles are delineated within white dashed lines. Comparison of T cell infiltration within 15l and RIR BF, as measured by fluorescent CD3⁺ cells, is represented as a bar graph. **p < 0.01 as determined by student unpaired t-test.