[Staphylococcus lugdunensis infection: report of 44 cases]. / Infección por Staphylococcus lugdunensis: descripción de 44 casos.

BACKGROUND: Staphylococcus lugdunensis is a coagulase-negative staphylococcus (CNS) with virulence and antibiotic sensitivity characteristics which makes it more similar to Staphylococcus aureus than other CNS. AIM: To know the microbiological and clinical characteristics of S. lugdunensis isolates identified from our health sector. METHODS: A retrospective study of S. lugdunensis isolates was carried out between 2017 and 2019 in the Microbiology Service of the San Jorge University Hospital in Huesca (Spain). The clinical records of patients with S. lugdunensis isolation were reviewed, considering the following factors: age, sex, sample type, service and underlying disease. Bacterial identification was performed using MALDI-TOF VITEK MS (BioMérieux, France). The pattern of antibiotic susceptibility was studied by means of plate microdilution. RESULTS: 44 isolates of S. lugdunensis were obtained: 12 corresponded to wounds, 10 were abscesses, 8 ulcers, 7 urine samples, 4 skin smears, 2 otic exudates, and 1 vaginal exudate. Regarding the underlying disease, five patients had a tumor processes and ten had diabetes mellitus. In 17 patients there was a history of recent surgery or trauma. Most of the strains were susceptible to the antibiotics studied. Production of beta-lactamase was observed in 19 of them, two were resistant to macrolides and three to clindamycin. None of the isolates were resistant to oxacillin, gentamicin or cotrimoxazole. CONCLUSIONS: Although S. lugdunensis maintains a good sensitivity to most antibiotics, its tendency to produce abscesses and that it expresses virulence factors more similar to S. aureus than to other CNS requires a correct identification in the laboratory so that its incidence is not underestimated.

Infección por Staphylococcus lugdunensis: descripción de 44 casos / Staphylococcus lugdunensis infection: report of 44 cases

INTRODUCCIÓN: Staphylococcus lugdunensis, es un estafilococo coagulasa negativa (SCN) con características de virulencia y de sensibilidad antimicrobiana que lo hacen más parecido a Staphylococcus aureus que a otros SCN. OBJETIVOS: Conocer las características clínicomicrobiológicas de los aislados de S. lugdunensis identificados en nuestra institución. MATERIAL Y MÉTODOS: Se realizó un estudio retrospectivo de los aislados de S. lugdunensis entre los años 2017 y 2019 en el Servicio de Microbiología del Hospital Universitario San Jorge de Huesca (España). Se revisaron las historias clínicas correspondientes a los pacientes con aislamiento de S. lugdunensis, considerándose las siguientes variables: edad, sexo, tipo de muestra, servicio de procedencia y enfermedad de base. La identificación bacteriana se realizó con MALDI-TOF VITEK MS (BioMérieux, Francia). Así mismo, se estudió su patrón de susceptibilidad antimicrobiana in vitro mediante microdilución en placa. RESULTADOS: Se obtuvieron 44 aislados de S. lugdunensis: 12 procedían de heridas, 10 fueron abscesos, 8 úlceras, 7 orinas, 4 frotis cutáneos, 2 exudados óticos, y 1 exudado vaginal. En relación con la enfermedad de base destacaron cinco pacientes con procesos tumorales y diez con diabetes mellitus. En 17 pacientes existían antecedentes de cirugía o traumatismo reciente. La mayoría de las cepas fueron sensibles a los antimicrobianos estudiados. En 19 de ellas se observó producción de β-lactamasa, dos fueron resistentes a macrólidos y tres a clindamicina. Todas las cepas fueron sensibles a oxacilina, gentamicina y cotrimoxazol. CONCLUSIONES: Aunque S. lugdunensis mantiene una buena sensibilidad a la mayoría de los antimicrobianos, su tendencia a producir abscesos y que exprese factores de virulencia más parecido a S. aureus que a otros SCN, hace necesaria una correcta identificación en el laboratorio con el fin de que su incidencia no quede subestimada.

BACKGROUND: Staphylococcus lugdunensis is a coagulase-negative staphylococcus (CNS) with virulence and antibiotic sensitivity characteristics which makes it more similar to Staphylococcus aureus than other CNS. AIM: To know the microbiological and clinical characteristics of S. lugdunensis isolates identified from our health sector. METHODS: A retrospective study of S. lugdunensis isolates was carried out between 2017 and 2019 in the Microbiology Service of the San Jorge University Hospital in Huesca (Spain). The clinical records of patients with S. lugdunensis isolation were reviewed, considering the following factors: age, sex, sample type, service and underlying disease. Bacterial identification was performed using MALDI-TOF VITEK MS (BioMérieux, France). The pattern of antibiotic susceptibility was studied by means of plate microdilution. RESULTS: 44 isolates of S. lugdunensis were obtained: 12 corresponded to wounds, 10 were abscesses, 8 ulcers, 7 urine samples, 4 skin smears, 2 otic exudates, and 1 vaginal exudate. Regarding the underlying disease, five patients had a tumor processes and ten had diabetes mellitus. In 17 patients there was a history of recent surgery or trauma. Most of the strains were susceptible to the antibiotics studied. Production of beta-lactamase was observed in 19 of them, two were resistant to macrolides and three to clindamycin. None of the isolates were resistant to oxacillin, gentamicin or cotrimoxazole. CONCLUSIONS: Although S. lugdunensis maintains a good sensitivity to most antibiotics, its tendency to produce abscesses and that it expresses virulence factors more similar to S. aureus than to other CNS requires a correct identification in the laboratory so that its incidence is not underestimated.

Resistencia antibiótica de Escherichia coli en infecciones urinarias nosocomiales y adquiridas en la comunidad del Sector Sanitario de Huesca 2016-2018 / Evolution of antibiotic resistance of Escherichia coli in nosocomial urinary tract infections in Primary and Hospital Care in Huesca

OBJETIVO: Determinar la resistencia in vitro del uropatógeno más frecuente, Escherichia coli, a varios antimicrobianos en nuestro Sector Sanitario y deducir opciones de tratamiento empírico. DISEÑO: Estudio epidemiológico descriptivo retrospectivo. MATERIAL Y MÉTODOS: Desde el 1 de enero de 2016 al 31 de diciembre de 2018 se estudiaron las cepas de E. coli aisladas de urocultivos de pacientes procedentes de Atención Primaria y Hospitalaria del Sector de Huesca. Se procesaron un total de 42004 muestras. Se determinó la sensibilidad a once antibióticos de uso frecuente. Se analizó la existencia de diferencias estadísticamente significativas de sensibilidad en los años estudiados, comparando sus correspondientes intervalos de confianza al 95 % (método de Fisher). RESULTADOS: E. coli ha sido la bacteria más frecuentemente aislada durante el periodo de estudio. La resistencia se ha mantenido por debajo del 4 % frente a fosfomicina y nitrofurantoína y por debajo del 12% a cefalosporinas de tercera generación. En cefuroxima y amoxicilina-clavulánico se ha observado un significativo aumento de la resistencia en las cepas hospitalarias con respecto a las de la comunidad en este periodo. Los máximos niveles de resistencia (superior al 20%) se encontraron en los antibióticos administrados vía oral y frecuentemente indicados en infecciones urinarias no complicadas: trimetoprim-sulfametoxazol, ciprofloxacino y amoxicilina. CONCLUSIONES: Estos resultados sugieren que el tratamiento empírico de primera elección para las infecciones urinarias en nuestra área sanitaria podrían ser fosfomicina, nitrofurantoína o cefalosporinas de segunda generación, aunque estas últimas sólo a nivel comunitario, mientras que en hospital su uso sin testar en antibiograma estaría desaconsejado por el porcentaje creciente de resistencias. No se recomendaría como tratamiento de primera elección trimetoprim-sulfametoxazol ni quinolonas

OBJECTIVES: To determine in-vitro resistance of the most frequent uropathogen, Escherichia coli, to several antibiotics in our health sector, and to deduce empirical treatment options. DESIGN: Retrospective descriptive epidemiological study. MATERIAL AND METHODS: E. coli strains isolated from urine cultures of patients from Primary and Hospital Care in Huesca Sector, between 1 January 2016 and 31 December 2018, were studied. A total of 42004 samples were processed. The sensitivity to eleven frequently used antibiotics was determined. The existence of statistically significant differences in sensitivity for the years under study was analyzed, comparing their corresponding 95% confidence intervals (Fisher's method). RESULTS: E. coli has been the most frequently isolated bacteria during the study period. Resistance to fosfomycin and nitrofurantoin has remained below 4%, and resistance to third generation cephalosporins below 12%. Regarding cefuroxime and amoxicillin-clavulanic acid, a significant increase in resistance in hospital strains with respect to community strains has been observed in this period. The highest levels of resistance (more than 20%) were found in antibiotics administered orally and frequently indicated in uncomplicated urinary tract infections: trimethoprim-sulfamethoxazole, ciprofloxacin, and amoxicillin. CONCLUSIONS: These results suggest that the first choice empirical treatments for urinary tract infections in our health area are fosfomycin, nitrofurantoin, or second generation cephalosporins. The latter is only at a community level, whereas its use in hospitals without testing in antibiogram is not recommended due to an increasing percentage of resistance. Trimethoprim-sulfamethoxazole or quinolones are not recommended as first choice treatment

Hepatitis C virus core antigen for screening organ donors and recipients.

Organ donors and recipients are routinely screened for hepatitis C virus (HCV) infection, typically via anti-HCV detection. We analyze the utility of an alternative HCV core antigen (HCV-Ag) quantification system, the ARCHITECT HCV Ag Assay, in this setting. We simultaneously tested 315 samples from potential organ donors and recipients using two chemiluminescent microparticle immunoassays: ARCHITECT Anti-HCV and HCV Ag (Abbott, Germany). HCV-Ag was detected in 81 of the serum samples (25.71%) and anti-HCV in 87 (27.62%). Seventy-five of the HCV-Ag-positive samples were positive for anti-HCV (92.59%). Overall concordance between the two assays was 94.29%. Of the six HCV-Ag-positive/anti-HCV-negative patients, five had HCV-Ag values <32 fmol/L, and the sixth had a concentration of 477.50 fmol/L (viral load, 137,000 IU/mL). The HCV AG Assay detects HCV infections missed by the Anti-HCV Assay. Both markers should be used to screen for HCV infection in potential organ donors and recipients.

Infecciones por virus de la hepatitis E en Zaragoza (2011-2015) / Hepatitis E infections in Zaragoza, Spain (2011-2015)

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Carbapenem-resistant Pseudomonas aeruginosa strains from a Spanish hospital: characterization of metallo-beta-lactamases, porin OprD and integrons.

Molecular typing and mechanisms of carbapenem resistance such as alterations in porin OprD and presence of metallo-beta-lactamases (MBLs), as well as integrons have been studied in a collection of carbapenem-resistant Pseudomonas aeruginosa (CRPA) isolates from a Spanish hospital. One hundred and twenty-three CRPA isolates were recovered from different samples of 80 patients. Clonal relationship among CRPA was analyzed by SpeI-PFGE. Susceptibility testing to 11 antibiotics and MBL phenotype was determined by microdilution, IP/IPI E-test and double disc method. The oprD gene was studied by PCR and sequencing, and mutations were determined comparing with P. aeruginosa PAO1 sequence. Characterization of MBLs, and class 1 and 2 integrons were studied by PCR and sequencing. SDS-PAGE analysis of outer membrane proteins of selected strains was performed. Seventy-four-per-cent of patients with CRPA were hospitalised in the ICU setting and 50% had long hospitalization stays. Sixty-four different PFGE patterns were detected, and 87 CRPA strains were further analyzed. MBL phenotype was detected in 43 of 87 strains (49.4%), which contained blaVIM-2 gene inside class 1 integrons. VIM-2-producing strains belonged to lineages ST175, ST235, and ST973. A great diversity of nucleotide insertions, deletions, and mutations in oprD gene, and the presence of a new insertion sequence (ISPa45) truncating oprD were identified among CRPA strains. Class 1 integrons were detected in 75% of CRPA strains, blaVIM-2 and the new arrangement aac(3)-Ia+ISPa34+aadA1 (named as In661) being the most frequent gene-cassette arrays detected. Other gene cassettes detected in integrons were: aadB, aadA6, aadA7, aac(6')-Ib', and blaOXA-46.

Molecular epidemiology, resistance profiles and clinical features in clinical plasmid-mediated AmpC-producing Enterobacteriaceae.

During the 30 months of surveillance period, 85 pAmpC-producing isolates were detected (prevalence 0.56% overall): blaCMY-2 gene in 70 E. coli, 2 K. pneumoniae and 6 P. mirabilis isolates; and the blaDHA-1 gene in 4 E. coli and 3 K. pneumoniae. In 8.23% of them, other ß-lactamases (predominantly OXA-1) were identified. All pAmpC-producing isolates were susceptible to carbapenems, whereas high resistance to nalidixic acid, ciprofloxacin and trimethoprim-sulfamethoxazole was observed among pAmpC-producing isolates (80%, 60%, and 44.7%, respectively). In hospital patients, predisposing factors such as prior antibiotic use, previous hospitalization, presence of an indwelling device, invasive urinary tract procedures and mechanical ventilation were observed. In the community setting, urinary tract infection was the most common type of infection related to pAmpC-producing isolates. A wide heterogeneity of clones was found among our E. coli isolates by PFGE, suggesting that this mechanism of resistance is not due to the dissemination of a clonal strain. Surveillance of these resistance mechanisms in the community is thus needed. Awareness of pAmpC dynamic is required to prevent introduction into hospitals and to control the spread of this emerging resistance within the community.