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Journal of Clinical Microbiology, March 2000, p. 1008-1015, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Multilocus Sequence Typing for Characterization of
Methicillin-Resistant and Methicillin-Susceptible Clones of
Staphylococcus aureus
Mark C.
Enright,1,*
Nicholas P. J.
Day,2
Catrin E.
Davies,2
Sharon J.
Peacock,2,3 and
Brian G.
Spratt1
Wellcome Trust Centre for the Epidemiology of
Infectious Disease, Department of Zoology, Oxford University, Oxford
OX1 3FY,1 and Wellcome Trust Centre for
Clinical Tropical Medicine, Nuffield Department of
Medicine,2 and Department of
Pathology and Bacteriology,3 Oxford University,
John Radcliffe Hospital, Oxford OX3 9DU, United Kingdom
Received 22 September 1999/Accepted 15 December 1999
A multilocus sequence typing (MLST) scheme has been developed for
Staphylococcus aureus. The sequences of internal fragments of seven housekeeping genes were obtained for 155 S. aureus
isolates from patients with community-acquired and hospital-acquired
invasive disease in the Oxford, United Kingdom, area. Fifty-three
different allelic profiles were identified, and 17 of these were
represented by at least two isolates. The MLST scheme was highly
discriminatory and was validated by showing that pairs of isolates with
the same allelic profile produced very similar SmaI
restriction fragment patterns by pulsed-field gel electrophoresis.
All 22 isolates with the most prevalent allelic profile
were methicillin-resistant S. aureus (MRSA) isolates and
had allelic profiles identical to that of a reference strain of the
epidemic MRSA clone 16 (EMRSA-16). Four MRSA isolates that were
identical in allelic profile to the other major epidemic MRSA clone
prevalent in British hospitals (clone EMRSA-15) were also identified.
The majority of isolates (81%) were methicillin-susceptible S. aureus (MSSA) isolates, and seven MSSA clones included five or
more isolates. Three of the MSSA clones included at least five isolates
from patients with community-acquired invasive disease and may
represent virulent clones with an increased ability to cause disease in
otherwise healthy individuals. The most prevalent MSSA clone (17 isolates) was very closely related to EMRSA-16, and the success of the
latter clone at causing disease in hospitals may be due to its
emergence from a virulent MSSA clone that was already a major cause of
invasive disease in both the community and hospital settings. MLST
provides an unambiguous method for assigning MRSA and MSSA isolates to known clones or assigning them as novel clones via the Internet.
*
Corresponding author. Mailing address: Wellcome Trust
Centre for the Epidemiology of Infectious Disease, Department of
Zoology, South Parks Rd., University of Oxford, Oxford OX1 3FY, United Kingdom. Phone: 44 1865-281274. Fax: 44 1865-281891. E-mail.
mark.enright{at}ceid.ox.ac.uk.
Journal of Clinical Microbiology, March 2000, p. 1008-1015, Vol. 38, No. 3
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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