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Journal of Antimicrobial Chemotherapy (2001) 47, 479-482
© 2001 The British Society for Antimicrobial Chemotherapy

Brief report

Sulbactam efficacy in experimental models caused by susceptible and intermediate Acinetobacter baumannii strains

María-Jesús Rodríguez-Hernándeza,*, Lucila Cuberosb, Cristina Pichardoa, Francisco J. Caballeroa, Ignacio Morenoa, M. Enrique Jiménez-Mejíasa, Andrés García-Curielb and Jerónimo Pachóna

a Service of Infectious Diseases and b Service of Microbiology, University Hospital Virgen del Rocio, Avenida Manuel Siurot s/n, 41013 Sevilla, Spain

Sulbactam and imipenem were compared in an experimental pneumonia model in immunocompetent mice, using a susceptible strain of Acinetobacter baumannii, and in an experimental endocarditis model in rabbits, using an intermediately susceptible strain. In the former, sulbactam was as efficacious as imipenem in terms of survival, sterility of lungs and in the bacterial clearance from lungs and blood, provided that the t > MIC for sulbactam (1.84 h) was similar to that for imipenem (2.01 h). In the endocarditis model, imipenem (t > MIC, 2.12 h) was more efficacious than sulbactam (t > MIC, 1.17 h) in bacterial clearance from vegetations. These results show the efficacy of sulbactam in infections caused by susceptible strains of A. baumannii, with an MIC up to 4 mg/L, provided that doses reach a t > MIC similar to that of imipenem. The activity of sulbactam was time dependent.

* Corresponding author. Tel: +34-955-01-23-76; Fax: +34-955-01-23-77; E-mail: jpachon{at}hvr.sas.cica.es


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