Publications by authors named "Alessandra Mercato"

The study aimed to investigate (i) the occurrence of third-generation cephalosporins and/or carbapenems non-sensitive in Pavia surface and groundwaters, (ii) their resistance determinants, and (iii) the clonal features of the most relevant strains. During May 13 and 14, 2019, = 18 water samples from = 12 sampling sites in the urban/peri-urban area of Pavia (Po Plain, Northern Italy) have been evaluated. At first, hydrochemical analysis and bacterial plate counts were carried out on all the water samples.

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Article Synopsis
  • Antimicrobial resistance (AMR) is a growing global issue, notably involving Extended-Spectrum Beta-Lactamases (ESβLs), which cause serious infections in humans and are found in wild boars that live near human and livestock populations.
  • A study conducted on 60 wild boars in Northern Italy identified 16 strains of ESβL-producing bacteria, indicating a prevalence of 23.3%, and revealed that these strains are not only resistant to multiple drugs but also possess various plasmid replicons.
  • Genome analysis of selected isolates uncovered two pandemic strains (ST131 and ST10) along with evidence of gene exchange mechanisms, highlighting the concern of wild boars as potential spreaders of antimicrobial resistance, advocating for their monitoring in
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Background: Cefiderocol is a siderophore cephalosporin that exhibits antimicrobial activity against most multi-drug resistant Gram-negative bacteria, including Enterobacterales, , , and .

Methods: A total of 20 multidrug-resistant strains were isolated from 2020 to 2021, molecularly characterized and tested to assess the in vitro antibacterial activity of cefiderocol. Thirteen strains were carbapenem-hydrolysing oxacillinase OXA-23-like producers, while seven were non-OXA-23-like producers.

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Article Synopsis
  • VIM (Verona Integron-encoded Metallo-beta-lactamase) is a type of enzyme that can break down almost all beta-lactam antibiotics, including carbapenems, except for monobactams.
  • This study focuses on a VIM-producing IncA plasmid taken from a clinical strain in an Italian Long-Term Care Facility, showing the gene can be transferred to other bacteria.
  • Whole-genome sequencing revealed two plasmids: one contained multiple antibiotic resistance genes, while the second was free from any resistance genes, emphasizing the role of IncA plasmids in spreading resistance, particularly in Italy.
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Antimicrobial consumption in veterinary medicine has led to the spread of multi drug-resistance in clinically important bacteria, with the companion animals and their environment involved as emerging reservoirs. While CTX-M-15 and CMY-2 acquired β-lactamases have been widely detected in the bacterial population of companion and breeding animals in European area, DHA-1 enzymes have been rarely reported in veterinary medicine. The aim of the study was to characterize the associated with mortality of a litter of Bulldog puppies in a breeding kennel located in Pesaro area, Central Italy.

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The spread of carbapenemase genes, such as , in poses a public health threat. The aim of the study was to characterize the genome and plasmids sequences of an NDM-1-positive strain (IBCRE14), which was isolated in 2019 from a catheterized patient hospitalized in Italy. : Whole genome sequencing (WGS) of IBCRE14 was performed on extracted genomic DNA using Sequel I platform.

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Klebsiella pneumoniae (KP) is an important pathogen involved in serious nosocomial infections all over the world. Here, we describe the first report on a blood-stream infection caused by an OXA-48/NDM-1 ST101-KP, in Italy. The patient was an Italian woman, transferred from Cairo Hospital to a Neurosurgery ward in Cuneo (IT).

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Aim of this study was to genetically characterize two carbapenemase-producing strains obtained from a pediatric patient affected by diarrhea, expressing OXA-181 and/or NDM-5 type enzymes. The above microorganisms were collected in the same Desenzano hospital (Northern Italy) where the gene was detected for the first time in Italy 3 years ago. One strain (5P), belonged to sequence type ST405/ST477 (according to Pasture/Oxford schemes) and serotype O102:H6.

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