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Journal of Antimicrobial Chemotherapy (1983) 12, 507-510
© 1983 The British Society for Antimicrobial Chemotherapy


research-article

Plasmid-determined ß-lactamases identified in a group of 204 ampicillin-resistant Enterobacteriaceae

C. Roy, A. Foz, C. Segura, M. Tirado, C. Foster and R. Reig

Departamento de Microbiología de la Facultad de Medicina de la Universidad Autónoma de Barcelona Bellaterra (Barcelona) Instituto Municipal de Investigación Médica, Paseo Marítimo s/n Barcelona-3, Spain

accepted 6 June 1983


Information is presented on the plasmid-determined ß-lactamases identified in 204 strains of ampicillin-resistant Enterobacteriaceae. The type most frequently identified was TEM-1 (in 85.3% of the strains), followed by SHV-1 (14.70%). Two types of plasmid-determined ß-lactamase were identified in 20 strains; in 18 of them one of the two was TEM-1 and in 13, SHV-1 (the TEM-1+SHV-1 combination was observed in 12 strains). In the 41 Klebsiella strains the most frequently identified enzyme was SHV-1 (in 28 of the strains) and the proportion of strains with two plasmid-determined ß-lactamases was higher than in the other species studied.


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