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[Determination of the sensitivity of bacteria to antibiotics by an agar diffusion method and use of the API ATB system: a comparative study].

A E Reynaud, B Coude du Foresto, Courtieu Al

Abstract

130 bacterial strains were studied for their antibiotics sensitivity by an agar diffusion method and using API ATB System: 50 Enterobacteriaceae, 12 other Gram negative bacilli, 48 Staphylococci and 20 Streptococci. The results concurred in 83 p. cent of the cases. Discrepancies were essentially observed for coagulase negative Staphylococci and Streptococci. Strains appeared more resistant by API ATB System than by the agar diffusion method. Discrepancies mostly concerned beta-lactam antibiotic sensitivity for Gram negative bacilli or aminoglycosides and macrolides sensitivity for Staphylococci. They also concerned sulfamides and trimethoprim sensitivity for all bacterial species.

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Key concepts: Microbiology, Agar, Bacilli, Antibiotics, Agar diffusion test, Antibiotic sensitivity, Bacteria, Coagulase