Table 1. Year of isolation, genetic background and country of origin of the 91 S. aureus porcine isolates included in the study.

Years	spa types (n)	ST (CC)	Country*
1973–1974	t127 (1)	ST1 (CC1)	BE
	t008 (1)	ST8 (CC8)
	t337 (1), t526 (3)	ST9, ST1092 (CC9)
	t156 (1)	ST12 (CC12)
	t012 (1), t318 (7)	ST30, ST2468 (CC30)
	t1236 (1), t2112 (2)	ST387 (CC97)
	t213 (1)	ST1343 (CC1343)
1991–2003	t127 (1)	ST1 (CC1)	NL
	t337 (1), t899 (5), t1334 (1), t3446 (1),	ST9 (CC9)	DK, HK, NL
	t2112 (2)	ST97 (CC97)	NL
	t12057 (1)	ST133 (CC133)	NL
	t318 (1), t1130 (1), t1921 (1), t2840 (1), t3427 (3)	ST433, N.D. (CC30)	NL, DK
2004–2009	t127 (1)	ST1 (CC1)	NL
	t337 (2), t2498 (1)	ST9 (CC9)	DK, NL
	t318 (2), t1333 (3), t3427 (1)	ST433 (CC30)	NL, DK
	t011 (13), t034 (11), t108 (3), t567 (1), t571 (3), t899 (1), t1254 (1), t1255 (4), t1730 (1), t1793 (1), t2876 (2), t2922 (1), t4838 (1)	ST398 (CC398)	BE, CA, DK, IT, NL
	Total isolates 91

N.D. ST unknown. The spa type was associated to CC30 on the basis of previous work [15], [29].

*Belgium (BE), Canada (CA), Denmark (DK), Hong Kong (HK), Italy (IT), The Netherlands (NL).