During the past 15 years, emergence and dissemination of β-lactam resistance in
nosocomial Enterobacteriaceae, Pseudomonas aeruginosa and Acinetobacter baumannii …

In the past decade CTX-M enzymes have become the most prevalent extended-spectrum β-
lactamases, both in nosocomial and in community settings. The insertion sequences (ISs) …

Since around 2000—earlier in Poland and Spain and later in France and the UK—dramatic
shifts have occurred in the prevalence and types of extended-spectrum β-lactamases …

In gram-negative bacteria, beta-lactamases are the most important mechanism of resistance
to beta-lactam antibiotics. Currently, the beta-lactamases receiving the most attention are the …

Integrons are versatile gene acquisition systems that allow efficient capturing of exogenous
genes and ensure their expression. Various classes of integrons possessing a wide variety …

Escherichia coli is an important microorganism in the gastrointestinal tract of warm-blooded
animals. Commensal populations of E. coli consist of stable genetic isolates, which means …

During 2010, we evaluated the presence of extended-spectrum β-lactamase–and AmpC-
producing enterobacteria in broiler chickens at slaughter. Samples (70 carcasses and 51 …

The spread of extended-spectrum-β-lactamase (ESBL)-producing organisms, particularly
those harboring the CTX-M-type enzymes, both in the hospital and in the community, is …

Aims: To carry out an assessment of the occurrence of resistance to antimicrobials in
Escherichia coli that has been isolated from young Black‐headed Gulls in three nesting …

Objectives To investigate the diversity of integrons and extended-spectrum β-lactamases
(ESBLs) among Enterobacteriaceae from chickens and swine in Portugal and analyse the …