Community-onset methicillin-resistant Staphylococcus aureus bacteremia in Northern Australia.
BACKGROUND
Community-onset infections caused by methicillin-resistant Staphylococcus aureus (COMRSA) are being increasingly reported worldwide.


METHODS
A retrospective study was performed of 14 patients with 15 episodes of COMRSA bacteremia (COMRSAB) admitted to the Royal Darwin Hospital, Northern Territory, Australia from 1998 to 2001. Isolates from COMRSAB episodes underwent extended susceptibility testing and molecular typing by pulsed field gel electrophoresis and allotyping of the staphylococcal cassette chromosome mec (SCCmec) region by polymerase chain reaction.


RESULTS
The proportion of community-onset S. aureus bacteremia episodes that were due to COMRSA increased from 9% in 1998 to 20% in 2001. The clinical features of COMRSAB were similar to those seen with methicillin-susceptible strains, including sepsis, endocarditis and metastatic infection. Ineffective empiric antimicrobial therapy was administered in the majority (80%) of episodes. All COMRSAB isolates tested contained allotype IV SCCmec, which is commonly found in community isolates of MRSA and rarely found in isolates from healthcare-associated MRSA infection.


CONCLUSIONS
The increasing incidence of COMRSAB in our region has resulted in the addition of vancomycin to standard empiric therapy in certain patients with suspected S. aureus bacteremia acquired in the community.
Department of Microbiology and Infectious Diseases, Royal Perth Hospital, G.P.O. Box X2213, Perth, Western Australia 6847, Australia. ronan.murray@health.wa.gov.au
Ronan J
RJ
Murray
Tien Tze
TT
Lim
Julie C
JC
Pearson
Warren B
WB
Grubb
Gary D
GD
Lum
D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001315:Australia / Q000453:epidemiology; D016470:Bacteremia / Q000453:epidemiology* / Q000382:microbiology; D017714:Community-Acquired Infections / Q000453:epidemiology* / Q000382:microbiology; D006801:Humans; D008712:Methicillin / Q000494:pharmacology; D016106:Methicillin Resistance / Q000235:genetics; D008826:Microbial Sensitivity Tests; D013203:Staphylococcal Infections / Q000453:epidemiology / Q000382:microbiology; D013211:Staphylococcus aureus / Q000145:classification / Q000187:drug effects* / Q000235:genetics
D000900:Anti-Bacterial Agents; D008712:Methicillin