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Table 5 Microscopic lesion scores in lungs of 5 day-old SPF chickens inoculated with field IBV strains IBV/MN, IBV/RA and IBV/TUIBV: infectious bronchitis virus

From: Assessment of pathogenicity and tissue distribution of infectious bronchitis virus strains (Italy 02 genotype) isolated from moroccan broiler chickens

  Lésions Mean lesion scores in IBV infected groups of birds
IBV/MN IBV/RA IBV/TU
Lung Primary & secondary Bronchi Epithelial hyperplasia 2 1,7 1
Loss of cilia 1 1 0,7
peribronchial infiltration by mononuclear inflammatory cells 2 1,3 0,3
Infiltration of lamina propria by heterophils & mononuclear inflammatory cells 2 1,3 0,3
Atria & parabronchi Hypertrophy of pneumocytes 0 0,7 1,3
Epithelial hyperplasia 0 0,7 1,3
Inter-capillarysepta hyperemia 1 1 1
  Mean of total Score of severity 7.333 7.666 6
  1. IBV infectious bronchitis virus
  2. SPF Specific pathogen free
  3. IBV/TU infectious bronchitis virus sampled from Abda-Doukkala region
  4. IBV/RA infectious bronchitis virus sampled from Rabat-Sale-Azzemour Zaire region
  5. IBV/MN infectious bronchitis virus sampled from Meknes Tafilalet region