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Table 3 Gross lesions in SPF chickens infected with QX-like IBV strain SD at different ages.

From: Pathogenic characteristics of a QX-like infectious bronchitis virus strain SD in chickens exposed at different ages and protective efficacy of combining live homologous and heterologous vaccination

Group

Lesions

Days post inoculation (dpi)

5

7

9

14

Xa

1

Tracheal exudate/hemorrhage

0/2b

2/2

2/2

0/2

–

Laryngeal exudate/hemorrhage

2/2

2/2

0/2

0/2

–

Renal enlargement/urate

1/2

2/2

1/2

2/2

–

Abnormal follicular development

–

–

–

–

6/18

Abnormal development of oviduct

–

–

–

–

9/18

2

Tracheal exudate/hemorrhage

0/2

1/2

1/2

2/2

–

Laryngeal exudate/hemorrhage

0/2

0/2

0/2

2/2

–

Renal enlargement/urate

2/2

1/2

1/2

2/2

–

Abnormal follicular development

–

–

–

–

8/20

Abnormal development of oviduct

–

–

–

–

3/20

3

Tracheal exudate/hemorrhage

2/2

2/2

1/2

2/2

–

Laryngeal exudate/hemorrhage

1/2

0/2

2/2

2/2

–

Renal enlargement/urate

0/2

2/2

2/2

2/2

–

Abnormal follicular development

–

–

–

–

1/11

Abnormal development of oviduct

–

–

–

–

1/11

4

Tracheal exudate/hemorrhage

2/2

1/2

2/2

2/2

–

Laryngeal exudate/hemorrhage

1/2

1/2

0/2

0/2

–

Renal enlargement/urate

1/2

0/2

1/2

2/2

–

Abnormal follicular development

–

–

–

–

2/7

Abnormal development of oviduct

–

–

–

–

1/7

5

Tracheal exudate/hemorrhage

2/2

2/2

0/2

–

–

Laryngeal exudate/hemorrhage

0/2

0/2

0/2

–

–

Renal enlargement/urate

1/2

2/2

2/2

–

–

Abnormal follicular development

–

–

–

–

3/9

Abnormal development of oviduct

–

–

–

–

1/9

6

Tracheal exudate/hemorrhage

0/10

0/10

0/10

0/8

–

Laryngeal exudate/hemorrhage

0/10

0/10

0/10

0/8

–

Renal enlargement/urate

0/10

0/10

0/10

0/8

–

Abnormal follicular development

–

–

–

–

0/12

Abnormal development of oviduct

–

–

–

–

0/12

  1. Group 1, 2-weeks-old chickens infected with IBV strain SD. Group 2, 3-weeks-old chickens infected with IBV strain SD. Group 3, 8-weeks-old chickens infected with IBV strain SD. Group 4, 18-weeks-old chickens infected with IBV strain SD. Group 5, 22-weeks-old chickens infected with IBV strain SD. Group 6, control group.
  2. aEnd of observation period at 168 d.
  3. bNumber of chickens exhibiting gross lesions out of the examined number of birds.