Table 1.

MDV strains used for the analyses in this study

Country	Strain	Virulence	Genome size (bp)	Accession No	References
Japan	Kgs-c1	–	174,999	LC589272	This study
USA	648a	vv +	176,080	JQ806361	Spatz et al. [36]
	Md5	vv	177,874	NC_002229	Tulman et al. [38]
	Md11	vv	170,950	AY510475	Niikura et al. [34]
	RB-1B	vv	178,246	EF523390	Spatz et al. [37]
	GA	v	174,077	AF147806	Lee et al. [33]
	CU-2	m	176,922	EU499381	Spatz et al. [35]
China	GX0101	vv	178,101	JX844666	Su et al. [42]
	LMS	vv	177,526	JQ314003	Cheng et al. [39]
	814	m/vaccine	172,541	JF742597	Zhang et al. [44]
	CC/1409	–	175,561	KU744560	Lv et al. [41]
	HNGS101	–	175,888	MG432697	He et al. [40]
	HNLC503	–	178,195	MG518371	–
	HS/1412	–	175,532	KU744561	Lv et al. [41]
	J-1	–	176,118	KU744555	Lv et al. [41]
	JL/1404	–	176,083	KU744559	Lv et al. [41]
	LCC	–	175,525	KU744556	Lv et al. [41]
	LCY	–	175,319	KX290013	Zhang et al. [43]
	LTS	–	176,023	KU744557	Lv et al. [41]
	WC/1203	–	176,057	KU744558	Lv et al. [41]
Poland	Polen5	hv**	177,821	MF431496	Trimpert et al. [46]
Israel	EU-1	hv	177,828	MF431494	Trimpert et al. [46]
Hungary	ATE2539	vv+	177,868	MF431493	Trimpert et al. [46]
England	pC12:130	vv	183,850*	FJ436096	Spatz et al. [45]
Hungary	MD70/13	v	177,844	MF431495	Trimpert et al. [46]
Netherland	CVI988	m/vaccine	178,311	DQ530348	Spatz et al. [32]

^*The length of pC12:130 genome contains a vector sequence

^**Hyper virulent (hv): Recent field strains isolated in Europe with a history of high virulence but not pathotyped within m–vv+ grading scheme [46]