Table-2.

Comparison of genome segment B amino acid substitutions at selected positions between Nigerian field viruses and published strains of IBDV.

Strain/isolate	TypeA	Amino acid substitution at positionsB
		96	119	123	141	145	146	147	148	150	154	161	163	219	242
AJ878668_HK46	vv	T	E	A	V	T	D	N	L	D	L	D	A	D	E
D49707_OKYM	vv	.	.	.	.	.	.	.	.	.	.	.	.	.	.
PLATEAU19/NG/2009	Non-vv	.	D	.	I	H	E	G	.	E	.	A	V	E	D
KWARA148/NG/2014	vv	N	.	.	.	.	.	.	.	.	.	.	.	.	.
PLATEAU161/NG/2014	Non-vv	.	D	.	I	Q	E	G	.	E	.	.	V	E	D
UYO167/NG/2014	Non-vv	.	D	.	I	H	E	G	.	E	.	.	V	E	D
PLATEAU39/NG/2012	Non-vv	.	.	.	I	Q	E	G	.	E	.	.	V	E	D
PLATEAU157/NG/2014	Non-vv	.	D	.	I	Q	D	G	.	E	I	.	V	E	D
UYO190/NG/2014	Non-vv	.	.	T	T	Q	E	G	P	E	.	.	V	E	D
KWARA141/NG/2014	vv	N	.	.	.	.	.	.	.	.	.	A	.	.	.
PLATEAU96/NG/2013	Non-vv	.	.	.	I	Q	E	G	P	E	.	.	.	E	D
PLATEAU40/NG/2012	vv	N	.	.	.	.	.	.	.	.	.	A	.	.	.
PLATEAU82/NG/2013	Non-vv	.	.	.	I	Q	E	G	P	E	.	.	.	E	D
PLATEAU90/NG/2013	Non-vv	.	D	.	I	Q	E	G	.	E	I	.	V	E	D
PLATEAU7/NG/2009	Non-vv	.	D	.	I	H	D	G	.	E	.	.	V	E	D
PLATEAU7/NG/2009	Non-vv	.	D	.	I	H	D	G	.	E	.	.	V	E	D
AJ878671_HENAN	vv	.	.	.	.	.	E	G	.	.	.	.	.	.	D
AY099457_T09	vv	.	.	.	.	.	.	.	.	.	.	.	.	.	.
AJ878656_BURS706	Vaccine	.	.	.	.	N	E	G	.	.	.	.	.	.	D
AJ878666_UK661	vv	.	.	.	.	.	.	.	.	.	.	.	.	.	.
AJ878676_DEL_E	Variant	.	.	.	.	N	E	D	.	.	.	.	.	.	D

^AType=The molecular strain of IBDV, Non-vv=Segment B sequence is not typical of a vvIBDV. Vaccine and Variant strains are not vvIBDV,

^BDots indicate sequences identical to those of the HK46 vvIBDV strain. IBDV=Infectious bursal disease virus, vv=Very virulent