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

Table 10

Lesions scoring (0-4) induced by velogenic and lentogenic NDV strains in HE stained thymus, proventriculus, and Harderian gland tissues on day 5 pi.

	vNDV	lNDV	Control
Thymus	4.00 ± 00 (5); 3.70^∗∗	0.20 ± 0.09 (5); 1.3	00 ± 00 (5)
Proventriculus	4.00 ± 00 (5)	1.40 ± 0.17 (5)	00 ± 00 (5)
Harderian	NA	1.3	00 ± 00 (3)

Values between brackets indicate the number of examined tissues.
scoring of tissues inoculated with LaSota 1 and 2 when chickens were 21 days old and 31 days old, respectively. Lesions were recorded when chickens were 40 days old [5].
scoring of tissues inoculated with LaSota (GenBank accession number AF077761). Lesions were recorded 4 days postinoculation [6].
^∗∗Lesion scoring of tissues infected by Quail2006 isolate, isolate’s name includes avian species and year of isolation, velogenic strain, and lesions were recorded 4 days postinoculation, chicken embryo mean death time (MDT) = 47.0, intracerebral pathogenicity index (ICPI) = 1.94, GenBank accession number EU518684 [9].
gland tissue was scored according to a system composed of 3 grades only.
NA = Tissues were not collected.