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JAC Advance Access published online on January 14, 2003
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkg083
© 2003 by The British Society for Antimicrobial Chemotherapy
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© 2003 The British Society for Antimicrobial Chemotherapy

Original article

Prevalence and types of class 1 integrons in aminoglycoside-resistant Enterobacteriaceae from several Chilean hospitals

Angélica Reyes 1, Helia Bello 1, Mariana Domínguez 1, S. Mella 1, R. Zemelman 2, G. González 1*

1 Departamento de Microbiología, Facultad de Ciencias Biológicas, Universidad de Concepción, Casilla 160-C., Concepción
2 Facultad de Medicina, Universidad San Sebastián, Concepción, Chile

* Corresponding author. E-mail: ggonzal{at}udec.cl.

Received 31 January 2002 ; revised 15 July 2002 ; accepted 6 October 2002

Abstract

Members of the family Enterobacteriaceae are responsible for a variety of nosocomial infections, treatment of which is limited due to their increasing resistance to antibiotics. Some bacterial genes encoding antibiotic resistance comprise the major part of gene cassettes, most of which are associated with integrons. In this work, the carriage of class 1, 2 and 3 integrons was investigated in 191 Enterobacteriaceae isolates from clinical specimens of hospitalized patients. Class 1 integrons were found to be the most common, whereas no class 3 integrons were detected. The variable regions of 13 class 1 integrons were characterized and four types were found. Type 1 harbours only ant(3'')I, type 2 harbours ant(2'')I and ant(3'')I, type 3 harbours aac(6')Ib and ant(3'')I and type 4 lacks inserted gene cassettes.


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