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Table 4 Results of in vivo IBDV virulence to SPF chickens

From: Identification and assessment of virulence of a natural reassortant of infectious bursal disease virus

Group no.

IBDV strain

Mortality (%)

B-BW index \(\bar{x}\) ± SD

Histopathologic lesion scoresc

3–5 dpi

10 dpi

1

Bpop/03 reassortant

8/10

(80)

4.53 ± 1.97

n = 6

1.43 ± 0.61b

n = 4

4, 4, 4, 4, 4, 4, 4, 4, 4, 4

2

75/11 vvIBDV control

6/10

(60)

5.73 ± 1.77

n = 6

1.45 ± 0.21

n = 4

4, 4, 4, 4, 4, 4, 2, 4, 4, 4

3

D78 attenuated IBDV control

0/10

(0)

nd

3.45 ± 1.09

n = 10

1, 2, 2, 2, 2, 2, 2, 1, 2, 2

4

Normal control

0/10

(0)

4.70 ± 0.19a

n = 5

5.44 ± 0.29

n = 5

1, 0, 0, 0, 0, 0, 0, 1, 0, 0

  1. aFrom chickens euthanized at 3 dpi.
  2. bFrom chickens dead at 9 dpi or euthanized at 10 dpi.
  3. cAccording to Jackwood et al. [5], \(\bar{x}\), arithmetic mean; SD: standard deviation; nd: not determined.
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Veterinary Research

ISSN: 1297-9716