Research Article

Scoring System for Lesions Induced by Different Strains of Newcastle Disease Virus in Chicken

Table 1

Lesions scoring (0-5) induced by vNDV in HE stained trachea, bursa of Fabricius, and spleen tissues on days 3, 6, and 7 pi.

TracheaBursa of FabriciusSpleen

Day 3 pi5.00 ± 0.00 (3)2.60 ± 0.12 (3)3.53± 0.18 (3)
Day 6 pi (one mortality case)5.00 (1)4.40 (1)4.40 (1)
Day 7 pi5.00 ± 0.00 (2)4.50± 0.10 (2)4.60± 0.00 (2)

Note. Scoring was expressed as mean ± SE. Values in brackets indicate the number of chickens.
One chicken died on day 6 pi. Tissues collected from the control group scored 0.