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Journal of Clinical Microbiology, August 2003, p. 3499-3502, Vol. 41, No. 8
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.8.3499-3502.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Evaluation of a Novel Medium for Screening Specimens from Hospitalized Patients To Detect Methicillin-Resistant Staphylococcus aureus

D. S. Blanc,1* A. Wenger,2 and J. Bille2

Hospital Preventive Medicine,1 Institute of Microbiology, University Hospital of Lausanne (CHUV), Lausanne, Switzerland2

Received 4 February 2003/ Returned for modification 16 March 2003/ Accepted 24 April 2003

A novel medium, Oxacillin Resistant Screening Agar (ORSA) medium, was evaluated for the screening of specimens for methicillin-resistant Staphylococcus aureus (MRSA) in the hospital setting. Screening swabs (swabs of the nose, throat, perineum, and infected sites) were inoculated onto the new ORSA medium and into an enrichment broth (Muller-Hinton broth supplemented with NaCl and oxacillin). After 24 h of incubation, the enrichment broth was subcultured onto one ORSA plate and one lipovitellin Chapman salt agar plate. The sensitivities for the detection of MRSA were calculated for each medium alone and for the media in combination. A low sensitivity (74%) was obtained when ORSA medium was used alone as a primary culture, whereas the sensitivity was 88% when a single selective enrichment broth was used. Among the 414 blue colonies observed on ORSA plates, only 47% were found to be MRSA, 40% were coagulase-negative staphylococci, 7% were Enterococcus species, and 2% were methicillin-sensitive S. aureus. The optimal incubation time for the ORSA plates was evaluated. On primary culture, 38% of the blue MRSA colonies were visible only after 48 h of incubation (no blue colonies were not seen after 24 h of incubation), whereas 94% of the colonies were already visible at 24 h when ORSA plates were used for subcultures. In conclusion, the advantage of the novel ORSA medium is the ease of recognition of mannitol-fermenting bacteria, but further identification tests are needed to confirm the identification of S. aureus. An enrichment broth is still needed to ensure a good sensitivity for the recovery of MRSA, and an incubation time of 48 h is required for primary culture on ORSA medium.

* Corresponding author. Mailing address: Division Autonome de Médecine Préventive Hospitalière, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland. Phone: 41 21 314 02 60. Fax: 41 21 314 02 62. E-mail: Dominique.Blanc{at}chuv.hospvd.ch.

Journal of Clinical Microbiology, August 2003, p. 3499-3502, Vol. 41, No. 8
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.8.3499-3502.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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