IS element IS16 as a molecular screening tool to identify hospital-associated strains of Enterococcus faecium

BMC Infectious Diseases

Table 1 Prevalence of epidemic markers among E. faecium isolates from different origins (see also Figure 1 and Additional Files 1, 2, 3).

Origin	No. of isolates	No. of MLST types	AmpR	PCR IS16+	PCR *esp*+	PCR *hyl* _Efm +	PCR *vanA+/B+*
Blood cultures	160	32	98.1% (n = 157)	96.9% (n = 155)	63.8% (n = 102)	45.6% (n = 73)	58.1% (n = 93)
Hosp.-associated E. faecium (CC17) ¹	155	28	100% (n = 156)	100% (n = 156)	65.8% (n = 102)	46.5% (n = 72)	58.7% (n = 91)
Human commensal	68	46	2.9% (n = 2)	4.4% (n = 3)²	0%	0%	14.7% (n = 10)
Animal commensal and meat sources	32	22	6.2% (n = 2)	0%	0%	0%	40.6% (n = 13)

BC MLST CC17 (second line) shown in italics (n = 155) is a subgroup of all blood culture E. faecium isolates presented in the first line representing all isolates allocated to the clonal complex of hospital-aascoiated strains (CC17).
AmpR, ampicillin resistance; ¹ including two isolates of ST65 representing a singleton but known to be found only among clinical strains; ² all three belonged to the clonal complex of hospital-associated strain types (MLST CC17; 2x ST18, 1x ST413; see also Additional file 4).

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