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Journal of Clinical Microbiology, November 2000, p. 3926-3931, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Community Acquisition of Gentamicin-Sensitive Methicillin-Resistant Staphylococcus aureus in Southeast Queensland, Australia

Graeme R. Nimmo,1,* Jacqueline Schooneveldt,1 Gabrielle O'Kane,1,dagger Brad McCall,2 and Alison Vickery3

Microbiology Department, Queensland Health Pathology Service, Princess Alexandra Hospital, Woolloongabba 4102,1 Brisbane Southside Public Health Unit, Coopers Plains 4108,2 and Microbiology Department, Royal Prince Alfred Hospital, Camperdown 2050,3 Australia

Received 12 April 2000/Returned for modification 28 June 2000/Accepted 18 August 2000

Community-acquired methicillin-resistant Staphylococcus aureus (MRSA) susceptible to gentamicin has been reported in a number of countries in the 1990s. To study the acquisition of gentamicin-sensitive MRSA (GS-MRSA) in southeast Queensland and the relatedness of GS-MRSA to other strains of MRSA, 35 cases of infection due to GS-MRSA from October 1997 through September 1998 were examined retrospectively to determine the mode of acquisition and risk factors for MRSA acquisition. Thirty-one isolates from the cases were examined using a variety of methods (antibiotyping, phage typing, pulsed-field gel electrophoresis [PFGE] fingerprinting, and coagulase typing by restriction analysis of PCR products) and were compared with strains of local hospital-acquired gentamicin-resistant MRSA (GR-MRSA) and of Western Australian MRSA (WA-MRSA). Only 6 of 23 cases of community-acquired GS-MRSA had risk factors for MRSA acquisition. Twenty of 21 isolates from cases of community-acquired infection were found to be related by PFGE and coagulase typing and had similar phage typing patterns. Hospital- and nursing home-acquired GS-MRSA strains were genetically and phenotypically diverse. Community-acquired GS-MRSA strains were not related to nosocomial GR-MRSA or WA-MRSA, but phage typing results suggest that they are related to GS-MRSA previously reported in New Zealand.

* Corresponding author. Mailing address: QHPS Microbiology Department, Princess Alexandra Hospital, Woolloongabba, Queensland 4102, Australia. Phone: 61 7 3240 2389. Fax: 61 7 3240 5786. E-mail: nimmog{at}health.qld.gov.au.

dagger Present address: Microbiology Department, The Prince Charles Hospital, Chermside 4032, Australia.

Journal of Clinical Microbiology, November 2000, p. 3926-3931, Vol. 38, No. 11
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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