TABLE 2.

Number of copper-resistant (Cop^r) and copper-susceptible (Cop^s) E. faecium isolates from each group of animals and humans correlated with resistance to macrolide (Ery^r) and glycopeptide (Van^r) resistance

Source and copper resistance phenotype	No. of E. faecium isolates
	Eryr	Erys	Vanr	Vans
Piga
Copr	41	4	14	31
Cops	0	14	0	14
Broilerb
Copr	5	5	3	7
Cops	11	8	0	19
Calfc
Copr	2	3	0	5
Cops	2	25	0	27
Sheepc
Copr	2	3	0	5
Cops	2	25	0	27
Humanc
Copr	1	2	0	3
Cops	12	14	0	26

^aThe level of Cop^r is significantly higher for Ery^r versus Ery^s (P < 0.0001) and for Van^r versus Van^s (P = 0.026)

^bThe level of Cop^r is not significantly higher for Ery^r versus Ery^s but it is significantly higher for Van^r versus Van^s (P = 0.033).

^cThe level of Cop^r is neither significantly higher (P > 0.05) for Ery^r versus Ery^s nor for Van^r versus Van^s.