Journal of Clinical Microbiology, June 2001, p. 2197-2205, Vol. 39, No. 6
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.6.2197-2205.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Molecular Genetics Laboratory, Instituto de Tecnologia Química e Biológica da Universidade Nova de Lisboa (ITQB/UNL), Oeiras,1 and Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa (FCT/UNL), Monte da Caparica,2 Portugal; Karolinska Institutet, Huddinge, Sweden3; Instituto Adolfo Lutz, São Paulo, Brazil4; Laboratorio de Salud Publica, Ministerio de Salud, Montevideo, Uruguay5; Servicio Antimicrobianos, Instituto Nacional de Enfermedades Infecciosas-A.N.L.I.S. "Dr. C. Malbrán," Buenos Aires, Argentina6; Centro de Investigaciones sobre Enfermedades Infecciosas, Instituto Nacional de Salud Publica, Cuernavaca, Morelos,7 and Hospital de Pediatria, CMN, Siglo XXI, IMSS, Mexico City,8 Mexico; Instituto de Salud Publica de Chile, Santiago, Chile9; and Laboratory of Microbiology, The Rockefeller University, New York, New York10
Received 4 January 2001/Returned for modification 4 March 2001/Accepted 11 March 2001
Four hundred ninety-nine methicillin-resistant Staphylococcus
aureus (MRSA) isolates recovered from 1996 to 1998 from 22 hospitals in five countries of Latin America
Argentina, Brazil, Chile,
Uruguay and Mexico
were examined for antimicrobial susceptibility and clonal type in order to define the endemic clones in those hospitals. The hybridization of ClaI restriction digests with the
mecA- and Tn554-specific DNA probes combined
with pulsed-field gel electrophoresis of chromosomal SmaI
digests
(ClaI-mecA::ClaI-Tn554::PFGE
clonal types) documented not only the predominance and persistence of the Brazilian clone (XI::B::B) in Brazil (97%) and
Argentina (86%) but also its massive dissemination to Uruguay (100%).
Moreover, a close relative of the Brazilian clone
(XI::
::B) was highly represented in Chile (53%)
together with a novel clone (47%) (II::E'::F) resistant to pencillin, oxacillin, ciprofloxacin, chloramphenicol, clindamycin, erythromycin, and gentamicin. A unique clonal type (I::NH::M) was detected in Mexico among pediatric
isolates and was resistant to penicillin, oxacillin, and gentamicin
only. This study clearly documented the very large capacity for
geographic expansion and the persistence of the Brazilian clone,
contributing not only to the increasing uniformity of the MRSA in South
America but worldwide as well.
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