Colonization with resistant microorganisms in patients transferred from abroad: who needs to be screened?

November 25, 2015 at 3:40 pm

Antimicrob Resist Infect Control. 2015 Jul 25;4:31.

Kaspar T1, Schweiger A2, Droz S3, Marschall J1.

Author information

1Department of Infectious Diseases and Prevention, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.

2Department of Internal Medicine, University Hospital Basel, Basel, Switzerland.

3Institute for Infectious Diseases, University of Bern, Bern, Switzerland.



While multi-drug resistant organisms (MDRO) are a global phenomenon, there are significant regional differences in terms of prevalence. Traveling to countries with a high MDRO prevalence increases the risk of acquiring such an organism. In this study we determined risk factors for MDRO colonization among patients who returned from a healthcare system in a high-prevalence area (so-called transfer patients). Factors predicting colonization could serve as screening criteria to better target those at highest risk.


This screening study included adult patients who had been exposed to a healthcare system abroad or in a high-prevalence region in Switzerland over the past six months and presented to our 950-bed tertiary care hospital between January 1, 2012 and December 31, 2013, a 24-month period. Laboratory screening tests focused on Gram-negative MDROs and methicillin-resistant Staphylococcus aureus (MRSA).


A total of 235 transfer patients were screened and analyzed, of which 43 (18 %) were positive for an MDRO. Most of them yielded Gram-negative bacteria (42; 98 %), with only a single screening revealing MRSA (2 %); three screenings showed a combination of Gram-negative bacteria and MRSA. For the risk factor analysis we focused on the 42 Gram-negative MDROs. Most of them were ESBL-producing Escherichia coli and Klebsiella pneumoniae while only two were carbapenemase producers. In univariate analysis, factors associated with screening positivity were hospitalization outside of Europe (p<0.001), surgical procedure in a hospital abroad (p=0.007), and – on admission to our hospital – active infection (p=0.002), antibiotic treatment (p=0.014) and presence of skin lesions (p=0.001). Only hospitalization outside of Europe (Odds Ratio, OR 3.2 (95 % CI 1.5- 6.8)) and active infection on admission (OR 2.7 (95 % CI 1.07- 6.6)) remained as independent predictors of Gram-negative MDRO colonization.


Our data suggest that a large proportion of patients (i.e., 82 %) transferred to Switzerland from hospitals in high MDRO prevalence areas are unnecessarily screened for MDRO colonization. Basing our screening strategy on certain criteria (such as presence of skin lesions, active infection, antibiotic treatment, history of a surgical procedure abroad and hospitalization outside of Europe) promises to be a better targeted and more cost-effective strategy.



Entry filed under: Antimicoticos, Bacterias, Bacteriemias, Epidemiología, Health Care-Associated Infections, Infecciones nosocomiales, Metodos diagnosticos, Resistencia bacteriana, Sepsis, Update.

Usefulness of previous methicillin-resistant Staphylococcus aureus screening results in guiding empirical therapy for S aureus bacteremia. Improving hospital hygiene to reduce the impact of multidrug-resistant organisms in health care-a prospective controlled multicenter study.


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