The ameliorating effect of some immune-stimulants on bursal and tracheal lesions of broiler chickens challenged with ND virus

The Journal of Basic and Applied Zoology

Table 1 The histopathological scoring of bursa of Fabricius of chicken examined in all four groups

	Group I	Group II	Group III	Group IV
Hyperplasia of bursal epithelium	12 birds^a +++^b	18 birds^a +++^b	20 birds^a +++^b	20 birds^a +++^b
Thickening of interfollicular stroma with inflammatory cellular infiltration	10 birds^a +++^b	16 birds^a +++^b	18 birds^a +++^b	20 birds^a +++^b
Lymphoid depletion of lymphoid follicles	20 birds^a ++^b	12 birds^a ++^b	10 birds^a ++^b	13 birds^a ++^b
Tightly packed lymphoid follicles	9 birds^a ++^b	13 birds^a ++^b	16 birds^a +++^b	12 birds^a +++^b
Epithelised follicular cysts	19 birds^a ++++^b	8 birds^a +++^b	15 bird^a +^b	13 birds^a ++^b
Medullary cyst	15 birds^a +++^b	11 birds^a ++^b	0^a 0^b	20 birds^a +++^b
Pyogranuloma	0^a 0^b	0^a 0^b	0^a 0^b	1 bird^a +^b

^aNumber of examined birds
^bThe severity degree of lesions designated as follows (Muskett et al., 1979): complete loss of follicular architecture and fibroplasias +++++, very severe ++++, severe +++, moderate ++, mild +, no damage 0