Antimicrobial susceptibility patterns of Aeromonas jandaei, A-schubertii, A-trota, and A-veronii biotype veronii

Fifty-six isolates of four Aeromonas species,,which have been documented as causative agents of human infections or isolated from human clinical speci mens, were subjected to antimicrobial susceptibility testing using a MicroS can WalkAway conventional (overnight incubation) gram-negative panel, The f our species tested and the number of isolates of each were as follows: Aero monas jandaei, 17; A. schubertii, 12; A. trota, 15; and A, veronii biotype veronii, 12, All isolates of A. trota Here susceptible to all antimicrobial agents tested, except cefazolin (20% of isolates Here resistant) and cefox itin (13% of isolates were resistant). NI isolates of A, schubertii and A, veronii biotype veronii, as well as 88% of A. jandaei isolates, Here resist ant to ampicillin, Resistance to ampicillin-sulbactam ranged from 25% of A. schubertii strains to 100% of A. veronii biotype veronii strains. Cefazoli n resistance ranged from 17% of A. veronii biotype veronii isolates to 59% of A. jandaei isolates. Imipenem resistance was detected in 65% of A. janda ei strains and 67% of A. veronii biotype veronii strains, A. jandaei displa yed resistance to piperacillin and ticarcillin in 53 and 71% of the isolate s, respectively. A. veronii biotype veronii strains were 100% susceptible t o piperacillin and 100% resistant to ticarcillin, These antibiogram data ma y be useful in establishing the identification of these four species when m embers of the genus Aeromonas are isolated from human clinical sources.