ureidopenicillins

ureidopenicillins

a group of penicillins, susceptible to gastric acidity and β-lactamase, but with a greater range of activity against gram-negative bacteria, especially Pseudomonas aeruginosa. Includes azlocillin, mezlocillin and piperacillin.
References in periodicals archive ?
AmpC AY-lactamases are resistant to aminopenicillins carboxypenicillins ureidopenicillins cephalosporins broad as well as extended spectrum cephalosporins (cephamycin) and monobactams (aztreonam).
If these microorganisms are human pathogens, they will influence the choice of antimicrobial drugs for empiric treatment because most are resistant to carboxypenicillins, ureidopenicillins, third-generation cephalosporins, and fluoroquinolones, which are commonly used in the ICU.
baumannii to antimicrobial drugs commonly used at that time, among them aminopenicillins, ureidopenicillins, first and second-generation cephalosporins, cephamycins, most aminoglycosides, chloramphenicol, and tetracyclines (19).
d) Acinetobacter baumanni: 9 (all with the same susceptibility pattern including susceptibility to ureidopenicillins, third -generation cephalosporins, aminoglycosides, and quinolones) and Ochrobactrum spp.
Our study, by contrast, found both ureidopenicillins and [beta]-lactam/[beta]-lactamase inhibitor combinations to be risk factors for the isolation of gram-negative organisms resistant to third-generation cephalosporins.
In routine antibiotic susceptibility testing, done by disk diffusion, both isolates showed a multidrug-resistant phenotype, including ureidopenicillins, piperacillin, piperacillin-tazobactam, ceftazidime, cefoperazone, cefepime, aztreonam, ciprofloxacin, gentamicin, netilmicin, imipenem, and meropenem.
Our results (not shown) indicate that In-t2 serves as a vehicle for the oxa-1 gene, extending betalactam resistance to ureidopenicillins, and of the aadA1 gene, conferring resistance to streptomycin and spectinomycin.