Comparative Study of the Immune Response Induced by an Argentinian Classical Strain of IBDV in Two Chicken Breeds

Table 1

Histopathological bursal lesions of infected chickens.

Lines		Dpi
		3	5	7	28
White Leghorn	Lymphoid depletion	2.67 ± 1.86a	4.17 ± 0.98a	4.83 ± 0.41a	3.33 ± 0.52a
Negra INTA	Lymphoid depletion	2 ± 1.67a	4.8 ± 0.45a	5 ± 0a	4 ± 1.67a
White Leghorn	Inflammatory infiltrate	2.5 ± 1.76a	3.5 ± 1.38a	3.83 ± 0.75a	3.17 ± 0.75a
Negra INTA	Inflammatory infiltrate	2.17 ± 1.83a	5 ± 0b	3.83 ± 0.75a	2.67 ± 1.03a

Bursae were extracted at 3, 5, 7, and 28 dpi, fixed, and stained for histological evaluation. Lymphoid depletion an inflammatory infiltrate were evaluated and scored for White Leghorn and Negra INTA chickens. Results are presented as the mean ± SD of the lesion scores registered for each group. a, b indicate significant differences between genotype groups per day (Wilcoxon–Mann–Whitney, p < 0.05).