Table VI.

Transmission of L. monocytogenes from a biofilm on silicone teat cups to the cow’s udder skin.

Strain	Number of re-isolated L. monocytogenes strains [log CFU/cm2]
	Silicone teat cup	Udder skin
		Sample 1	Sample 2	Sample 3	Sample 4	Sample 5	Sample 6	Sample 7	Sample 8	Regrowth on first negative or last positive sample (12 h/25°C)
M372	6.87* ± 6.12**	4.33 ± 3.98	3.88 ± 3.77	3.71 ± 3.34	3.45 ± 2.88	2.92 ± 2.71	2.66 ± 2.35	2.09 ± 2.31	1.85 ± 1.84	2.92 ± 2.74
M375	6.79 ± 6.09	4.54 ± 4.37	3.99 ± 3.82	3.65 ± 3.63	3.10 ± 3.45	2.83 ± 2.69	2.51 ± 1.96	1.92 ± 1.82	1.61 ± 1.31	2.79 ± 2.62
M231	4.74 ± 3.96	3.87 ± 3.72	3.76 ± 3.79	3.47 ± 3.55	2.79 ± 2.71	2.52 ± 2.33	1.93 ± 1.20	1.67 ± 1.47	1.08 ± 1.54	1.99 ± 1.85
M63	4.64 ± 3.72	3.96 ± 3.82	3.80 ± 3.33	3.34 ± 3.62	2.70 ± 2.58	2.33 ± 2.32	1.86 ± 1.78	1.59 ± 1.48	n.d.	1.87 ± 1.51
ATCC 19111	5.80 ± 5.04	3.64 ± 3.67	3.02 ± 3.51	2.79 ± 2.39	2.62 ± 2.44	2.14 ± 2.48	1.79 ± 1.51	1.53 ± 1.63	n.d.	2.01 ± 2.31
B5	5.70 ± 4.87	3.56 ± 3.71	2.85 ± 2.70	2.63 ± 2.20	2.48 ± 2.23	1.96 ± 1.86	1.76 ± 1.61	1.43 ± 1.01	n.d.	1.81 ± 1.20
B6	5.67 ± 4.76	3.47 ± 3.17	2.91 ± 2.76	2.76 ± 1.99	2.39 ± 2.61	1.92 ± 1.65	1.64 ± 1.71	1.26 ± 1.33	n.d.	1.72 ± 1.80
B10	3.71 ± 3.72	2.85 ± 2.58	2.57 ± 2.20	1.88 ± 1.57	1.49 ± 1.04	n.d.***	n.d.	n.d.	n.d.	1.63 ± 1.41
B4	3.61 ± 3.71	2.92 ± 2.88	2.73 ± 2.53	1.84 ± 161	1.20 ± 1.35	n.d.	n.d.	n.d.	n.d.	1.38 ± 1.50

^*- Mean

^**- Standard deviation

^***- Not detected