Table 6 The cell number of IgM ⁺ cells, KUL01 ⁺ macrophages, CD3 ⁺ CD4 ⁺ cells and CD3 ⁺ CD8 ⁺ cells in bursae and spleens of 3-week-old chickens infected with vvIBDV strain UPM0081 at 2, 4 and 5 dpi

Average number of cells

Day 0

230.00 ± 2.73^a

190.00 ± 3.41^a

Day 2

173.00 ± 3.64^b

150.00 ± 2.76^b

Day 4

116.00 ± 1.66^c

66.40 ± 2.31^c

Day 5

54.00 ± 1.37^d

34.40 ± 2.32^d

IgM⁺

Day 0

189.83 ± 0.83^a

57.36 ± 1.21^a

Day 2

138.99 ± 0.50^b

44.35 ± 0.15^b

Day 4

72.21 ± 0.55^c

23.27 ± 1.00^c

Day 5

35.52 ± 3.07^d

14.57 ± 1.55^d

KUL-1⁺

Day 0

9.90 ± 0.52^a

6.26 ± 0.13^a

Day 2

8.76 ± 0.22^a

18.54 ± 0.93^b

Day 4

20.68 ± 2.16^b

2.08 ± 0.31^c

Day 5

12.92 ± 3.50^c

2.75 ± 0.49^c

CD3⁺CD4⁺

Day 0

1.73 ± 0.12^a

41.49 ± 0.80^a

Day 2

1.67 ± 0.09^a

33.04 ± 1.51^b

Day 4

3.82 ± 0.43^b

16.52 ± 2.12^c

Day 5

4.25 ± 0.48^b

7.58 ± 0.53^d

CD3⁺CD8⁺

Day 0

1.67 ± 0.14^a

62.36 ± 0.61^a

Day 2

1.86 ± 0.30^a

48.68 ± 0.98^b

Day 4

3.05 ± 0.38^b

20.87 ± 0.66^c

Day 5

3.52 ± 0.20^b

6.81 ± 0.38^d