Table 3. Spa types and genetic characteristics of select S. aureus isolates recovered from US beefpacking workers (n = 37 carriers)^a.

Ridom spa typec	Number (n = 37)	scn-negativeb (n = 5)	PVL-positive (n = 4)	MRSA (n = 5)
t002	2 (5.4)	0	0	1 (20)
t008	2 (5.4)	0	2 (50)	2 (40)
t024	2 (5.4)	0	2 (50)	2 (40)
t338	1 (2.7)	1 (20)	0	0
t748	1 (2.7)	1 (20)	0	0
t1248	4 (10.8)	0	0	0
t1476	1 (2.7)	1 (20)	0	0
t2379	1 (2.7)	1 (20)	0	0

^a Five MSSA isolates were non-typeable, including one scn-negative isolate.

^b scn negative defined as presumptive livestock-associated S. aureus. One scn-negative isolate was non-typeable.

^c The following 15 spa types were recovered from one worker each (n = 1; 2.7%), were all scn-positive, PVL negative and MSSA: t021, t065, t078, t189, t276, t304, t458, t571, t688, t701, t992, t1250, t3182, t4298, t4976, t6150.