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Volume 17, Number 6—June 2011

Research

Methicillin-Resistant Staphylococcus aureus, Samoa, 2007–2008

James Alesana-Slater, Stephen R. RitchieComments to Author , Helen Heffernan, Tracy Camp, Alice Richardson, Peter Herbison, and Pauline Norris
Author affiliations: Author affiliations: University of Otago, Dunedin, New Zealand (J. Alesana-Slater, P. Herbison, P. Norris); University of Auckland, Auckland, New Zealand (S.R. Ritchie); Institute of Environmental Science and Research Limited, Wellington, New Zealand (H. Heffernan, A. Richardson); Auckland City Hospital, Auckland (T. Camp)

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Table 2

Strains identified among the MRSA isolates, Samoa, summer 2007–2008*

No. (%) isolates Strain† MLST type No. (%) PVL-positive isolates spa type (% of strain) Antimicrobial drug susceptibility
(% of strain)
10 (29) USA300 ST8 9 (90) t008 (100) Resistant to ciprofloxacin and erythromycin (80); resistant to ciprofloxacin (20)
9 (26) Queensland clone ST93 9 (100) t3949 (56), t202 (44)‡ Resistant only to β-lactams (100)
9§ (26) ST1 0 t1853 (78), t6080 (11)¶ Resistant only to β-lactams (89);
resistant to erythromycin** (11)
4 (12) Southwest Pacific/
WSPP/Oceania clone ST30 4 (100) t019 (100) Resistant only to β-lactams (100)
2 (6) AK3 ST5 0 t002 (50), t1265 (50)# Resistant to erythromycin** (50); resistant only to β-lactams (50)

*MRSA, methicillin-resistant S. aureus; MLST, multilocus sequence typing; PVL, Panton-Valentine leukocidin; WSPP, Western Samoa Phage Pattern.
†International MRSA strain designations, except for AK3, which is a New Zealand designation for a community-associated MRSA strain common in New Zealand.
spa type t3949 (11–17–23–17–17–17–16–16–25) is a single-repeat variant of t202 (11–17–23–17–17–16–16–25). The extra repeat is shown in boldface.
§Only 8/9 ST1 MRSA isolates were available for PVL PCR, spa typing, and pulsed-field gel electrophoresis (PFGE) typing. Seven of the 8 isolates had indistinguishable PFGE profiles, and the eighth shared 87% homology.
spa type t6080 (07–23–21–17–13–13–34–16–13–33–13) is a single-repeat variant of t1853 (07–23–21–17–13–34–16–13–33–13). The extra repeat is shown in boldface.
#spa type t1265 (26–23–17–34–17–20–17–12–1212–16) is a variant of t002 (26–23–17–34–17–20–17–12–17–16). The differing repeats are shown in boldface.
**This isolate also had inducible clindamycin resistance.

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