Journal of Antimicrobial Chemotherapy (1993) 31, 473-480
© 1993 The British Society for Antimicrobial Chemotherapy
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Activity of the ß-lactamase inhibitor BRL 42715 against cephalosporinases produced by Enterobacteriaceae
aLaboratoire de Microbiologie Médicale, Université Paris VI 15 rue de l'Ecole de Médicine, 75270 Paris Cedex 06, France bLaboratoire de Microbiologie, Hôpital Saint-Joseph 7 rue Pierre-Larousse, 75674 Paris Cedex 14, France cLaboratoire de Microbiologie, Hôpitai Broussais 96 rue Didot, 75014 Paris, France
Received 18 June 1992; accepted 26 November 1992
*Corresponding author
BRL 42715, a novel ß-lactamase inhibitor, was evaluated for its capacity to inhibit cephalosporinases. BRL 42715 was effective in potentiating the activity of antibiotics against clinical isolates of Enterobacteriaceae that produced high levels of cephalo sporinases. This correlated well with the very low 5O% inhibition values (<0004 mg/L) of BRL 42715 for cephalosporinases extracted from different species. When compared in vitro to clavulanic acid, sulbactam, and tazobactam, BRL 42715 was the most efficient inhibitor of cephalosporinase.