[Colistin resistance in carbapenem-resistant Klebsiella pneumoniae isolates from a pediatric hospital from Corrientes, Argentina].

Background: There is an increase of carbapenem-resistant Klebsiella pneumoniae (CRKP) infections in the pediatric population and epidemiological data are limited.

Aim: To calculate the frequency of CRKP in pediatric patients, to determine the in vitro activity of colistin and to detect the presence of mcr-1 gene in said isolates.

Methods: 220 isolates of K.

Correlation between virulence markers of Helicobacter pylori in the oral cavity and gastric biopsies.

Background:: The clinical outcome of Helicobacter pylori infection has been associated with virulence factors. The presence of these factors is useful as molecular markers in the identification of the high risk for developing severe gastric pathologies.

Objective:: To correlate the presence of virulence markers cagA and bab2A of H.

[Detection of diarrheagenic Escherichia coli in children from poor neighborhoods in Corrientes, Argentina].

Introduction: acute diarrheas bring high morbidity and mortality in developing countries and diarrheagenic Escherichia coli (DEC) appears as frequent etiological agent in all these places.

Objective: to detect the presence of pathogenic types of DEC in children attending the Health Centers in poor neighborhoods in the city of Corrientes, Argentina.

Methods: Feces from one hundred and twenty patients were cultured; E.

Molecular detection of Helicobacter pylori in oral samples from patients suffering digestive pathologies.

Objective: to determine the simultaneous presence of H. pylori in both the oral cavity and gastric mucosal in patients suffering digestive pathologies and to establish the possible association between the presence of H. pylori in the oral cavity and the gingivoperiodontal pathology.

[Fecal colonization by extended-spectrum beta-lactamase-producing Klebsiella pneumoniae in a neonatal intensive care unit].

Background: Fecal colonization by multiresistant bacteria can be a source of nosocomial infections. The aim of this work was to study fecal colonization by Klebsiella pneumoniae in neonatal intensive care unit (NICU) patients and investigate the resistance profiles of the strains.

Methods: From May to October 2001, 11 stool specimens were collected from each patient hospitalized in the NICU during this period (425 specimens).

Bacteriologic findings in patients with chronic sinusitis.

We studied the bacteriology of maxillary sinus aspirates obtained from patients diagnosed with chronic sinusitis. We recovered 659 strains from 510 aspirates; of these, 572 (86.8%) were aerobes and 87 (13.

[Detection of Enterococcus with high-level aminoglycoside and glycopeptide resistance in Lactuca sativa (lettuce)].

Background: The aim of this study was to assess the presence of enterococci highly resistant to aminoglycosides and glycopeptides in foods eaten uncooked, in order to evaluate their role as reservoirs of antimicrobial resistance.

Methods: We isolated 92 strains of enterococci from 79 samples of lettuce grown on farms near the city of Corrientes (Argentina). Enterococci were identified by standard methods.