Colonization with antibiotic-susceptible strains protects against methicillin-resistant Staphylococcus aureus but not vancomycin-resistant enterococci acquisition: a nested case-control study

Table 3 Variables associated with methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococcus (VRE) acquisition

Variable	Odds ratio ^a (95% CI)	P Value
MRSA
MSSA carrier	0.52 (0.29, 0.95)	0.03
Intubation	4.65 (1.77, 12.26)	0.002
Fluoroquinolone	1.91 (1.20, 3.04)	0.01
ICU admit to negative swab		< .0001
1 day	1.0, reference
2 days	1.97 (1.17, 3.30)
≥ 3 days	15.59 (8.40, 28.94)
VRE
VSE carrier	1.37 (0.54, 3.48)	0.51
End-stage renal disease	2.60 (1.19, 5.70)	0.02
Albumin < 2	2.07 (1.12, 3.83)	0.02
Fluoroquinolone	1.90 (1.14, 3.17)	0.01
Third generation Cephalosporin	1.89 (1.15, 3.10)	0.01
ICU admit to negative swab		< .0001
1 day	1.0, reference
2 days	1.42 (0.79, 2.56)
≥ 3 days	15.13 (7.86, 29.14)

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