Antimicrobial Susceptibility Patterns of Aeromonas jandaei , A. schubertii , A. trota , and A. veronii Biotype veronii

Abstract

Fifty-six isolates of four Aeromonas species, which have been documented as causative agents of human infections or isolated from human clinical specimens, were subjected to antimicrobial susceptibility testing using a MicroScan WalkAway conventional (overnight incubation) gram-negative panel. The four species tested and the number of isolates of each were as follows: Aeromonas jandaei, 17; A. schubertii, 12; A. trota, 15; and A. veronii biotype veronii, 12. All isolates ofA. trota were susceptible to all antimicrobial agents tested, except cefazolin (20% of isolates were resistant) and cefoxitin (13% of isolates were resistant). All isolates of A. schubertii and A. veronii biotype veronii, as well as 88% of A. jandaei isolates, were resistant to ampicillin. Resistance to ampicillin-sulbactam ranged from 25% of A. schubertii strains to 100% of A. veronii biotype veronii strains. Cefazolin resistance ranged from 17% of A. veronii biotype veronii isolates to 59% of A. jandaei isolates. Imipenem resistance was detected in 65% ofA. jandaei strains and 67% of A. veroniibiotype veronii strains. A. jandaei displayed resistance to piperacillin and ticarcillin in 53 and 71% of the isolates, respectively. A. veronii biotype veronii strains were 100% susceptible to piperacillin and 100% resistant to ticarcillin. These antibiogram data may be useful in establishing the identification of these four species when members of the genusAeromonas are isolated from human clinical sources.

Potential virulence and antimicrobial susceptibility of Aeromonas popoffii recovered from freshwater and seawater

“…However, it is not clear if clavulanic acid shows intrinsic activity against Aeromonas, or if it inhibits the ac- Table 2 Primers designed and PCR conditions for the detection of virulence genes tivity of some of the chromosome-mediated L-lactamases. The resistance to cephalosporins shown in our study agrees with that reported for the species A. jandaei, A. schubertii, A. trota and A. veronii bt veronii [30] and also with that previously reported for A. popo¤i [3,29].…”

“…In this study, we have tested all available strains against a total of 26 antibiotics, 10 of which have never been tested against this species (piperacillin^tazobactam, cefalotin, ceftibuten, merope- nem, fosfomycin, pipemidic acid, colistin, ampicillin^sulbactam, amoxycillin^clavulanic acid and trimethoprimŝ ulfamethoxazole). As expected, all A. popo¤i strains were resistant to ampicillin, a characteristic trait for most of the species of the genus [30]. By contrast, all the strains were susceptible to piperacillin, piperacillin^tazobactam, cefalotin, cefuroxime, ceftibuten, cefotaxime, ceftazidime, aztreonam, imipenem, meropenem, gentamicin, amikacin, tobramycin, fosfomycin, pipemidic acid, cipro-£oxacin, nor£oxacin, colistin and trimethoprim^sulfame-thoxazole.…”

Prevalence and antimicrobial susceptibility ofAeromonasspecies from diseased Chinese soft-shelled turtles (Trionyx sinens)

“…And all of these tested isolates were collected from human clinical specimens. Eight antimicrobial agents were adopted both in this study and three previous reports (Kampeer, Christmann, Swings & Huys ; Overman & Janda ; Vila et al . ) (Table ).…”

“…). Antibiotic therapy is one of the most frequently used and effective methods for Aeromonas ‐mediated infections (Overman & Janda ; Vila, Marco, Soler, Chacon & Figueras ). However, there is paucity of systematic knowledge on the prevalence and antibiotic susceptibility of turtle‐source Aeromonas isolates.…”

Antibiotic resistance and repetitive‐element PCR fingerprinting in Aeromonas veronii isolates

“…As in the present study, there are differences on antibiotic resistance according to isolated sources of Aeromonas spp. (Overman & Janda ; Aravena‐Roman et al . ).…”