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Low Yield of Methicillin-Resistant Staphylococcus aureus Screening in Hemodialysis Patients: 10 Years’ Experience

Published online by Cambridge University Press:  26 May 2015

H. M. Gebreselassie
Affiliation:
Department of Infectious Diseases, Bern University Hospital, Bern, Switzerland
T. Kaspar
Affiliation:
Department of Infectious Diseases, Bern University Hospital, Bern, Switzerland
S. Droz
Affiliation:
Institute for Infectious Diseases, University of Bern, Bern, Switzerland
J. Marschall
Affiliation:
Department of Infectious Diseases, Bern University Hospital, Bern, Switzerland

Abstract

OBJECTIVE

To determine the prevalence of methicillin-resistant Staphylococcus aureus (MRSA) nasal colonization in hemodialysis patients and to analyze the cost-effectiveness of our screening approach compared with an alternative strategy.

DESIGN

Screening study and cost-effectiveness analysis.

METHODS

Analysis of twice-yearly MRSA prevalence studies conducted in the hemodialysis unit of a 950-bed tertiary care hospital from January 1, 2004, through December 31, 2013. For this purpose, nasal swab samples were cultured on MRSA screening agar (mannitol-oxacillin biplate).

RESULTS

There were 20 mass screenings during the 10-year study period. We identified 415 patients participating in at least 1 screening, with an average of 4.5 screenings per patient. Of 415 screened patients, 15 (3.6%) were found to be MRSA carriers. The first mass screening in 2004 yielded the highest percentage of MRSA (6/101 [6%]). Only 7 subsequent screenings revealed new MRSA carriers, whereas 4 screenings confirmed previously known carriers, and 8 remained negative. None of the carriers developed MRSA bacteremia during the study period. The total cost of our screening approach, that is, screening and isolation costs, was US $93,930. The total cost of an alternative strategy (ie, no mass screening administered) would be equivalent to costs of isolation of index cases and contact tracing was estimated to be US $5,382 (difference, US $88,548).

CONCLUSIONS

In an area of low MRSA endemicity (<5%), regular nasal screenings of a high-risk population yielded a low rate of MRSA carriers. Twice-yearly MRSA screening of dialysis patients is unlikely to be cost-effective if MRSA prevalence is low.

Infect. Control Hosp. Epidemiol. 2015;36(9):1046–1049

Type
Original Articles
Copyright
© 2015 by The Society for Healthcare Epidemiology of America. All rights reserved 

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