Table 1.

Number of cows, proportion ofS. aureusinfected cows and frequencies of the different CC

Herd	Investigated cows	Proportion ofS. aureusinfected cows	CC151	CC479	CC133	CC97	CC398	CC9	CC20	CC45	CC101	CC7	CC50
	n	%	n	n	n	n	n	n	n	n	n	n	n
1	79	50.00				6
2	273	18.38	3						3
3	117	33.33	6
4	322	9.91	5	1
5	1156	6.32	4	1			1
6	645	3.04	1	1	4
7	1111	6.29	1		3						2
8	2172	13.22	1	3			2
9	1482	2.37			3		3
10	699	2.40		4	2
11	349	23.21	5		1
12	75	4.00	1	1
13	678	0.63	1		1					1
14	773	8.29	5	1
15	739	6.04		3				3
16	125	6.98	6
17	233	8.23	3	2	1
18	354	16.80	3	1	2
19	684	12.27	4	2
20	714	11.31	6
21	259	7.88	5		1
22	1029	3.77	6
23	194	8.47	3	3
24	996	0.31		1								1
25	1738	18.89		2	2				2
26	749	14.12	1			2		2			1
27	32	40.00	2							4
28	863	14.71	4	1			1
29	74	19.51	5										1
30	410	12.27		6
31	332	0.84	1			1
32	380	13.65	5				1
33	666	4.71	5		1
34	336	12.12	6
∑	20 838	9.19	98	33	21	9	8	5	5	5	3	1	1