| | Intranasal inoculation of v NDV | Number of tissues in which lesions appeared, out of 3 examined tissues stained with HE |
| | Hour 2 pi | (2/3) in trachea. |
| | Hour 4 pi | (3/3) in the trachea and (1/3) in the caecal tonsil. |
| | Hour 6 pi | (3/3) in the trachea and caecal tonsil. |
| | Hour 12 pi | (3/3) trachea and caecal tonsil, (1/3) in proventriculus and spleen. |
| | Day 1 pi | (3/3) trachea and caecal tonsil, proventriculus, spleen, (1/3) bursa of Fabricius and liver, (3/3) kidney and intestine, and (1/3) in the lung. |
| | Day 2 pi | (3/3) in the trachea, and caecal tonsil, (3/3) proventriculus and spleen, (1/3) in bursa of Fabricius, (3/3) in the liver, kidney, heart, and thymus, (1/3) in the intestine, and (3/3) in the lung. |
| | Day 4 pi | (3/3) in the trachea, and caecal tonsil, (1/3) in the brain, (3/3) in proventriculus, spleen, bursa of Fabricius, liver, kidney, heart, thymus, intestine, and lung. |
| | Day 5 pi | (3/3) in the trachea, caecal tonsil, (2/3) in the brain, (3/3) in proventriculus, spleen, bursa of Fabricius, liver, kidney, heart, and thymus, intestine and the lung. |
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Note. Values between brackets before slash indicate the number of a certain tissue in which lesions were detected pi of vNDV in SPF chickens, while values after slash indicate the whole number of a certain tissue collected, stained with HE, and examined. Lesions were not detected in tissues of control group chickens.
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