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1.
Antimicrob Agents Chemother ; 68(2): e0092523, 2024 Feb 07.
Artículo en Inglés | MEDLINE | ID: mdl-38169291

RESUMEN

We describe the inter-regional spread of a novel ESBL-producing Escherichia coli subclone (ST131H89) in long-term care facility residents, general population, and environmental water sources in Western Switzerland between 2017 and 2020. The study highlights the importance of molecular surveillance for tracking emerging antibiotic-resistant pathogens in healthcare and community settings.


Asunto(s)
Infecciones por Escherichia coli , Proteínas de Escherichia coli , Humanos , Infecciones por Escherichia coli/epidemiología , Suiza , Escherichia coli/genética , Proteínas de Escherichia coli/genética , Antibacterianos , beta-Lactamasas , Epidemiología Molecular
2.
Crit Care ; 27(1): 269, 2023 07 06.
Artículo en Inglés | MEDLINE | ID: mdl-37415223

RESUMEN

BACKGROUND: Immune suppression has been implicated in the occurrence of pneumonia in critically ill patients. We tested the hypothesis that Intensive Care Unit (ICU)-acquired pneumonia is associated with broad host immune aberrations in the trajectory to pneumonia, encompassing inflammatory, endothelial and coagulation responses. We compared plasma protein biomarkers reflecting the systemic host response in critically ill patients who acquire a new pneumonia (cases) with those who do not (controls). METHODS: We performed a nested case-control study in patients undergoing mechanical ventilation at ICU admission with an expected stay of at least 48 h enrolled in 30 hospitals in 11 European countries. Nineteen host response biomarkers reflective of key pathophysiological domains were measured in plasma obtained on study inclusion and day 7, and-in cases-on the day of pneumonia diagnosis. RESULTS: Of 1997 patients, 316 developed pneumonia (15.8%) and 1681 did not (84.2%). Plasma protein biomarker analyses, performed in cases and a randomly selected subgroup of controls (1:2 ratio to cases, n = 632), demonstrated considerable variation across time points and patient groups. Yet, cases showed biomarker concentrations suggestive of enhanced inflammation and a more disturbed endothelial barrier function, both at study enrollment (median 2 days after ICU admission) and in the path to pneumonia diagnosis (median 5 days after ICU admission). Baseline host response biomarker aberrations were most profound in patients who developed pneumonia either shortly (< 5 days, n = 105) or late (> 10 days, n = 68) after ICU admission. CONCLUSIONS: Critically ill patients who develop an ICU-acquired pneumonia, compared with those who do not, display alterations in plasma protein biomarker concentrations indicative of stronger proinflammatory, procoagulant and (injurious) endothelial cell responses. TRIAL REGISTRATION: ClinicalTrials.gov Identifier: NCT02413242, posted April 9th, 2015.


Asunto(s)
Enfermedad Crítica , Neumonía , Humanos , Estudios de Casos y Controles , Unidades de Cuidados Intensivos , Proteínas Sanguíneas , Biomarcadores
3.
BMC Med ; 20(1): 406, 2022 10 24.
Artículo en Inglés | MEDLINE | ID: mdl-36280827

RESUMEN

BACKGROUND: The diagnostic accuracy of unsupervised self-testing with rapid antigen diagnostic tests (Ag-RDTs) is mostly unknown. We studied the diagnostic accuracy of a self-performed SARS-CoV-2 saliva and nasal Ag-RDT in the general population. METHODS: This large cross-sectional study consecutively included unselected individuals aged ≥ 16 years presenting for SARS-CoV-2 testing at three public health service test sites. Participants underwent molecular test sampling and received two self-tests (the Hangzhou AllTest Biotech saliva self-test and the SD Biosensor nasal self-test by Roche Diagnostics) to perform themselves at home. Diagnostic accuracy of both self-tests was assessed with molecular testing as reference. RESULTS: Out of 2819 participants, 6.5% had a positive molecular test. Overall sensitivities were 46.7% (39.3-54.2%) for the saliva Ag-RDT and 68.9% (61.6-75.6%) for the nasal Ag-RDT. With a viral load cut-off (≥ 5.2 log10 SARS-CoV-2 E-gene copies/mL) as a proxy of infectiousness, these sensitivities increased to 54.9% (46.4-63.3%) and 83.9% (76.9-89.5%), respectively. For the nasal Ag-RDT, sensitivities were 78.5% (71.1-84.8%) and 22.6% (9.6-41.1%) in those symptomatic and asymptomatic at the time of sampling, which increased to 90.4% (83.8-94.9%) and 38.9% (17.3-64.3%) after applying the viral load cut-off. In those with and without prior SARS-CoV-2 infection, sensitivities were 36.8% (16.3-61.6%) and 72.7% (65.1-79.4%). Specificities were > 99% and > 99%, positive predictive values > 70% and > 90%, and negative predictive values > 95% and > 95%, for the saliva and nasal Ag-RDT, respectively, in most analyses. Most participants considered the self-performing and result interpretation (very) easy for both self-tests. CONCLUSIONS: The Hangzhou AllTest Biotech saliva self Ag-RDT is not reliable for SARS-CoV-2 detection, overall, and in all studied subgroups. The SD Biosensor nasal self Ag-RDT had high sensitivity in individuals with symptoms and in those without prior SARS-CoV-2 infection but low sensitivity in asymptomatic individuals and those with a prior SARS-CoV-2 infection which warrants further investigation.


Asunto(s)
COVID-19 , SARS-CoV-2 , Humanos , COVID-19/diagnóstico , Estudios Transversales , Prueba de COVID-19 , Saliva , Sensibilidad y Especificidad , Antígenos Virales
4.
Artículo en Inglés | MEDLINE | ID: mdl-33820769

RESUMEN

Limited information is available on whether blaKPC-containing plasmids from isolates in a hospital outbreak can be differentiated from epidemiologically unrelated blaKPC-containing plasmids based on sequence data. This study aimed to evaluate the performance of three approaches to distinguish epidemiologically related from unrelated blaKPC-containing pKpQiL-like IncFII(k2)-IncFIB(pQiL) plasmids. Epidemiologically related isolates were subjected to short- and long-read whole-genome sequencing. A hybrid assembly was performed, and plasmid sequences were extracted from the assembly graph. Epidemiologically unrelated plasmid sequences were extracted from GenBank. Pairwise comparisons of epidemiologically related and unrelated plasmids based on SNPs using snippy and of phylogenetic distance using Roary and using a similarity index that penalizes size differences between plasmids (Stoesser index) were performed. The percentage of pairwise comparisons misclassified as genetically related or as clonally unrelated was determined using different genetic thresholds for genetic relatedness. The ranges of number of SNPs, Roary phylogenetic distance, and Stoesser index overlapped between the epidemiologically related and unrelated plasmids. When a genetic similarity threshold that classified 100% of epidemiologically related plasmid pairs as genetically related was used, the percentages of plasmids misclassified as epidemiologically related ranged from 6.7% (Roary) to 20.8% (Stoesser index). Although epidemiologically related plasmids can be distinguished from unrelated plasmids based on genetic differences, blaKPC-containing pKpQiL-like IncFII(k2)-IncFIB(pQiL) plasmids show a high degree of sequence similarity. The phylogenetic distance as determined using Roary showed the highest degree of discriminatory power between the epidemiologically related and unrelated plasmids.


Asunto(s)
Enterobacteriaceae , beta-Lactamasas , Proteínas Bacterianas/genética , Enterobacteriaceae/genética , Klebsiella pneumoniae/genética , Filogenia , Plásmidos/genética , beta-Lactamasas/genética
5.
Clin Infect Dis ; 69(1): 93-99, 2019 06 18.
Artículo en Inglés | MEDLINE | ID: mdl-30281072

RESUMEN

BACKGROUND: Surgical site infections (SSIs) are common complications after colorectal procedures and remain an important source of morbidity and costs. Preoperative oral antibiotic prophylaxis is a potential infection control strategy, but its effectiveness without simultaneous use of mechanical bowel preparation (MBP) is unclear. In this study, we aimed to determine whether preoperative oral antibiotics reduce the risk of deep SSIs in elective colorectal surgery. METHODS: We performed a before-after analysis in a teaching hospital in the Netherlands. Patients who underwent surgery between January 2012 and December 2015 were included. On 1 January 2013, oral antibiotic prophylaxis with tobramycin and colistin was implemented as standard of care prior to colorectal surgery. The year before implementation was used as the control period. The primary outcome was a composite of deep SSI and/or mortality within 30 days after surgery. RESULTS: Of the 1410 patients, 352 underwent colorectal surgery in the control period and 1058 in the period after implementation of the antibiotic prophylaxis. We observed a decrease in incidence of the primary endpoint of 6.2% after prophylaxis implementation. When adjusted for confounders, the risk ratio for development of the primary outcome was 0.58 (95% confidence interval, 0.40-0.79). Other findings included a decreased risk of anastomotic leakage and a reduction in the length of postoperative stay. CONCLUSIONS: Preoperative oral antibiotic prophylaxis prior to colorectal surgery is associated with a significant decrease in SSI and/or mortality in a setting without MBP. Preoperative oral antibiotics can therefore be considered without MBP for patients who undergo colorectal surgery.


Asunto(s)
Antibacterianos/administración & dosificación , Profilaxis Antibiótica , Cirugía Colorrectal/efectos adversos , Procedimientos Quirúrgicos Electivos/efectos adversos , Infección de la Herida Quirúrgica/prevención & control , Administración Oral , Anciano , Colistina/administración & dosificación , Estudios Controlados Antes y Después , Femenino , Humanos , Masculino , Persona de Mediana Edad , Países Bajos , Cuidados Preoperatorios , Estudios Retrospectivos , Infección de la Herida Quirúrgica/mortalidad , Tobramicina/administración & dosificación
6.
J Antimicrob Chemother ; 74(12): 3481-3488, 2019 12 01.
Artículo en Inglés | MEDLINE | ID: mdl-31504559

RESUMEN

OBJECTIVES: AmpC-ß-lactamase production is an under-recognized antibiotic resistance mechanism that renders Gram-negative bacteria resistant to common ß-lactam antibiotics, similar to the well-known ESBLs. For infection control purposes, it is important to be able to discriminate between plasmid-mediated AmpC (pAmpC) production and chromosomal-mediated AmpC (cAmpC) hyperproduction in Gram-negative bacteria as pAmpC requires isolation precautions to minimize the risk of horizontal gene transmission. Detecting pAmpC in Escherichia coli is challenging, as both pAmpC production and cAmpC hyperproduction may lead to third-generation cephalosporin resistance. METHODS: We tested a collection of E. coli strains suspected to produce AmpC. Elaborate susceptibility testing for third-generation cephalosporins, WGS and machine learning were used to develop an algorithm to determine ampC genotypes in E. coli. WGS was applied to detect pampC genes, cAmpC hyperproducers and STs. RESULTS: In total, 172 E. coli strains (n=75 ST) were divided into a training set and two validation sets. Ninety strains were pampC positive, the predominant gene being blaCMY-2 (86.7%), followed by blaDHA-1 (7.8%), and 59 strains were cAmpC hyperproducers. The algorithm used a cefotaxime MIC value above 6 mg/L to identify pampC-positive E. coli and an MIC value of 0.5 mg/L to discriminate between cAmpC-hyperproducing and non-cAmpC-hyperproducing E. coli strains. Accuracy was 0.88 (95% CI=0.79-0.94) on the training set, 0.79 (95% CI=0.64-0.89) on validation set 1 and 0.85 (95% CI=0.71-0.94) on validation set 2. CONCLUSIONS: This approach resulted in a pragmatic algorithm for differentiating ampC genotypes in E. coli based on phenotypic susceptibility testing.


Asunto(s)
Proteínas Bacterianas/genética , Cromosomas Bacterianos , Escherichia coli/genética , Plásmidos/genética , beta-Lactamasas/genética , Algoritmos , Antibacterianos/farmacología , Escherichia coli/efectos de los fármacos , Escherichia coli/enzimología , Genotipo , Pruebas de Sensibilidad Microbiana , Fenotipo , Secuenciación Completa del Genoma
7.
N Engl J Med ; 372(14): 1312-23, 2015 Apr 02.
Artículo en Inglés | MEDLINE | ID: mdl-25830421

RESUMEN

BACKGROUND: The choice of empirical antibiotic treatment for patients with clinically suspected community-acquired pneumonia (CAP) who are admitted to non-intensive care unit (ICU) hospital wards is complicated by the limited availability of evidence. We compared strategies of empirical treatment (allowing deviations for medical reasons) with beta-lactam monotherapy, beta-lactam-macrolide combination therapy, or fluoroquinolone monotherapy. METHODS: In a cluster-randomized, crossover trial with strategies rotated in 4-month periods, we tested the noninferiority of the beta-lactam strategy to the beta-lactam-macrolide and fluoroquinolone strategies with respect to 90-day mortality, in an intention-to-treat analysis, using a noninferiority margin of 3 percentage points and a two-sided 90% confidence interval. RESULTS: A total of 656 patients were included during the beta-lactam strategy periods, 739 during the beta-lactam-macrolide strategy periods, and 888 during the fluoroquinolone strategy periods, with rates of adherence to the strategy of 93.0%, 88.0%, and 92.7%, respectively. The median age of the patients was 70 years. The crude 90-day mortality was 9.0% (59 patients), 11.1% (82 patients), and 8.8% (78 patients), respectively, during these strategy periods. In the intention-to-treat analysis, the risk of death was higher by 1.9 percentage points (90% confidence interval [CI], -0.6 to 4.4) with the beta-lactam-macrolide strategy than with the beta-lactam strategy and lower by 0.6 percentage points (90% CI, -2.8 to 1.9) with the fluoroquinolone strategy than with the beta-lactam strategy. These results indicated noninferiority of the beta-lactam strategy. The median length of hospital stay was 6 days for all strategies, and the median time to starting oral treatment was 3 days (interquartile range, 0 to 4) with the fluoroquinolone strategy and 4 days (interquartile range, 3 to 5) with the other strategies. CONCLUSIONS: Among patients with clinically suspected CAP admitted to non-ICU wards, a strategy of preferred empirical treatment with beta-lactam monotherapy was noninferior to strategies with a beta-lactam-macrolide combination or fluoroquinolone monotherapy with regard to 90-day mortality. (Funded by the Netherlands Organization for Health Research and Development; CAP-START ClinicalTrials.gov number, NCT01660204.).


Asunto(s)
Antibacterianos/uso terapéutico , Fluoroquinolonas/uso terapéutico , Macrólidos/uso terapéutico , Neumonía Bacteriana/tratamiento farmacológico , beta-Lactamas/uso terapéutico , Administración Oral , Adulto , Anciano , Infecciones Comunitarias Adquiridas/tratamiento farmacológico , Infecciones Comunitarias Adquiridas/mortalidad , Estudios Cruzados , Quimioterapia Combinada , Femenino , Humanos , Análisis de Intención de Tratar , Tiempo de Internación , Masculino , Persona de Mediana Edad , Neumonía Bacteriana/mortalidad
8.
Infection ; 46(5): 711-716, 2018 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-29845457

RESUMEN

A mycotic aneurysm caused by a Clostridium septicum is a rare infection and has a strong association with colorectal cancer. If left untreated, the mortality rate of the first 24 h is high. This case report discusses the optimal treatment of emergency surgery combined with antibiotic treatment to improve survival. We present a fatal case of a 71-year-old male with abscedation of a caecal carcinoma who shortly after developed a mycotic aneurysm of the infrarenal aorta as a result of a C. septicum infection.


Asunto(s)
Aneurisma Infectado/diagnóstico , Aneurisma Infectado/etiología , Infecciones por Clostridium/diagnóstico , Infecciones por Clostridium/etiología , Clostridium septicum , Neoplasias Colorrectales/complicaciones , Anciano , Aneurisma Infectado/tratamiento farmacológico , Biomarcadores , Infecciones por Clostridium/tratamiento farmacológico , Neoplasias Colorrectales/diagnóstico , Terapia Combinada , Resultado Fatal , Gangrena Gaseosa/diagnóstico , Gangrena Gaseosa/tratamiento farmacológico , Gangrena Gaseosa/etiología , Humanos , Masculino , Tomografía Computarizada por Rayos X
10.
J Clin Microbiol ; 55(8): 2380-2390, 2017 08.
Artículo en Inglés | MEDLINE | ID: mdl-28515215

RESUMEN

In the Netherlands, the number of cases of infection with New Delhi metallo-beta-lactamase (NDM)-positive Enterobacteriaceae is low. Here, we report an outbreak of NDM-1-producing Klebsiella pneumoniae infection in a Dutch hospital with interspecies transfer of the resistance plasmid and unexpected occurrence in other unrelated health care centers (HCCs). Next-generation sequencing was performed on 250 carbapenemase-producing Enterobacteriaceae isolates, including 42 NDM-positive isolates obtained from 29 persons at the outbreak site. Most outbreak isolates were K. pneumoniae (n = 26) and Escherichia coli (n = 11), but 5 isolates comprising three other Enterobacteriaceae species were also cultured. The 26 K. pneumoniae isolates had sequence type 873 (ST873), as did 7 unrelated K. pneumoniae isolates originating from five geographically dispersed HCCs. The 33 ST873 isolates that clustered closely together using whole-genome multilocus sequence typing (wgMLST) carried the same plasmids and had limited differences in the resistome. The 11 E. coli outbreak isolates showed great variety in STs, did not cluster using wgMLST, and showed considerable diversity in resistome and plasmid profiles. The blaNDM-1 gene-carrying plasmid present in the ST873 K. pneumoniae isolates was found in all the other Enterobacteriaceae species cultured at the outbreak location and in a single E. coli isolate from another HCC. We describe a hospital outbreak with an NDM-1-producing K. pneumoniae strain from an unknown source that was also found in patients from five other Dutch HCCs in the same time frame without an epidemiological link. Interspecies transfer of the resistance plasmid was observed in other Enterobacteriaceae species isolated at the outbreak location and in another HCC.


Asunto(s)
Infección Hospitalaria/epidemiología , Brotes de Enfermedades , Enterobacteriaceae/enzimología , Transferencia de Gen Horizontal , Infecciones por Klebsiella/epidemiología , Plásmidos/análisis , beta-Lactamasas/genética , Infección Hospitalaria/microbiología , Enterobacteriaceae/clasificación , Enterobacteriaceae/genética , Enterobacteriaceae/aislamiento & purificación , Genotipo , Instituciones de Salud , Humanos , Infecciones por Klebsiella/microbiología , Tipificación de Secuencias Multilocus , Países Bajos/epidemiología
11.
BMC Infect Dis ; 17(1): 643, 2017 09 25.
Artículo en Inglés | MEDLINE | ID: mdl-28946849

RESUMEN

BACKGROUND: The epidemiology of ICU pneumonia caused by Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) is not fully described, but is urgently needed to support the development of effective interventions. The objective of this study is to estimate the incidence of S. aureus and P. aeruginosa ICU pneumonia and to assess its association with patient-related and contextual risk factors. METHODS: ASPIRE-ICU is a prospective, observational, multi-center cohort study nested within routine surveillance among ICU patients in Europe describing the occurrence of S. aureus and P. aeruginosa ICU pneumonia. Two thousand (2000) study cohort subjects will be enrolled (50% S. aureus colonized) in which specimens and data will be collected. Study cohort subjects will be enrolled from a larger surveillance population, in which basic surveillance data is captured. The primary outcomes are the incidence of S. aureus ICU acquired pneumonia and the incidence of P. aeruginosa ICU acquired pneumonia through ICU stay. The analysis will include advanced survival techniques (competing risks and multistate models) for each event separately as well as for the sub-distribution of ICU pneumonia to determine independent association of outcomes with risk factors.. A risk prediction model will be developed to quantify the risk for acquiring S. aureus or P. aeruginosa ICU pneumonia during ICU stay by using a composite score of independent risk factors. DISCUSSION: The diagnosis of pathogen-specific ICU pneumonia is difficult, however, the criteria used in this study are objective and comparable to those in the literature. TRIAL REGISTRATION: This study is registered on clinicaltrials.gov under identifier NCT02413242 .


Asunto(s)
Neumonía Bacteriana/epidemiología , Neumonía Estafilocócica/epidemiología , Infecciones por Pseudomonas/epidemiología , Adulto , Estudios de Cohortes , Europa (Continente)/epidemiología , Humanos , Incidencia , Unidades de Cuidados Intensivos/estadística & datos numéricos , Persona de Mediana Edad , Estudios Multicéntricos como Asunto , Estudios Observacionales como Asunto , Neumonía Bacteriana/microbiología , Neumonía Estafilocócica/microbiología , Estudios Prospectivos , Pseudomonas aeruginosa/patogenicidad , Factores de Riesgo , Staphylococcus aureus/patogenicidad
12.
Ann Surg ; 263(3): 511-5, 2016 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-26565136

RESUMEN

OBJECTIVE: To identify patients who benefit most from Staphylococcus aureus screening and decolonization treatment upon admission. BACKGROUND: S. aureus carriers are at increased risk of developing surgical-site infections with S. aureus. Previously, we demonstrated in a randomized, placebo-controlled trial (RCT) that these infections can largely be prevented by detection of carriage and decolonization treatment upon admission. In this study, we analyzed 1- and 3-year mortality rates in both treatment arms of the RCT to identify patient groups that should be targeted when implementing the screen-and-treat strategy. METHODS: Three years after enrolment in the RCT, mortality dates of all surgical patients were checked. One- and 3-year mortality rates were calculated for all patients and for various subgroups. RESULTS: After 3 years, 44 of 431 (10.2%) and 43 of 362 (11.9%) patients had died in the mupirocin/chlorhexidine and placebo groups, respectively. No significant differences in mortality rates were observed between the treatment groups or the subgroups according to type of surgery. In the subgroup of patients with clean procedures (382 cardiothoracic, 167 orthopedic, 61 vascular, and 56 other), mupirocin/chlorhexidine reduced 1-year mortality: 11 of 365 (3.0%) died in the mupirocin/chlorhexidine versus 21 of 301 (7.0%) in the placebo group [hazard ratio = 0.38 (95% CI: 0.18-0.81)]. CONCLUSIONS: Detection and decolonization of S. aureus carriage not only prevents S. aureus surgical-site infections but also reduces 1-year mortality in surgical patients undergoing clean procedures. Such patients with a high risk of developing S. aureus infections should therefore be the primary target when implementing the screen-and-treat strategy in clinical practice.


Asunto(s)
Antibacterianos/farmacología , Antiinfecciosos Locales/farmacología , Clorhexidina/farmacología , Mupirocina/farmacología , Infecciones Estafilocócicas/prevención & control , Staphylococcus aureus/efectos de los fármacos , Infección de la Herida Quirúrgica/prevención & control , Portador Sano , Método Doble Ciego , Femenino , Estudios de Seguimiento , Humanos , Masculino , Factores de Riesgo , Infecciones Estafilocócicas/mortalidad , Infección de la Herida Quirúrgica/microbiología , Infección de la Herida Quirúrgica/mortalidad
13.
J Clin Microbiol ; 54(12): 2919-2927, 2016 12.
Artículo en Inglés | MEDLINE | ID: mdl-27629900

RESUMEN

Molecular typing has become indispensable in the detection of nosocomial transmission of bacterial pathogens and the identification of sources and routes of transmission in outbreak settings, but current methods are labor-intensive, are difficult to standardize, or have limited resolution. Whole-genome multilocus sequence typing (wgMLST) has emerged as a whole-genome sequencing (WGS)-based gene-by-gene typing method that may overcome these limitations and has been applied successfully for several species in outbreak settings. In this study, genus-, genetic-complex-, and species-specific wgMLST schemes were developed for Citrobacter spp., the Enterobacter cloacae complex, Escherichia coli, Klebsiella oxytoca, and Klebsiella pneumoniae and used to type a national collection of 1,798 extended-spectrum-beta-lactamase-producing Enterobacteriaceae (ESBL-E) isolates obtained from patients in Dutch hospitals. Genus-, genetic-complex-, and species-specific thresholds for genetic distance that accurately distinguish between epidemiologically related and unrelated isolates were defined for Citrobacter spp., the E. cloacae complex, E. coli, and K. pneumoniae wgMLST was shown to have higher discriminatory power and typeability than in silico MLST. In conclusion, the wgMLST schemes developed in this study facilitate high-resolution WGS-based typing of the most prevalent ESBL-producing species in clinical practice and may contribute to further elucidation of the complex epidemiology of antimicrobial-resistant Enterobacteriaceae wgMLST opens up possibilities for the creation of a Web-accessible database for the global surveillance of ESBL-producing bacterial clones.


Asunto(s)
ADN Bacteriano/genética , Infecciones por Enterobacteriaceae/microbiología , Enterobacteriaceae , Tipificación de Secuencias Multilocus/métodos , beta-Lactamasas/genética , Citrobacter/clasificación , Citrobacter/genética , Citrobacter/aislamiento & purificación , Enterobacter cloacae/clasificación , Enterobacter cloacae/genética , Enterobacter cloacae/aislamiento & purificación , Enterobacteriaceae/clasificación , Enterobacteriaceae/genética , Enterobacteriaceae/aislamiento & purificación , Escherichia coli/clasificación , Escherichia coli/genética , Escherichia coli/aislamiento & purificación , Humanos , Klebsiella oxytoca/clasificación , Klebsiella oxytoca/genética , Klebsiella oxytoca/aislamiento & purificación , Klebsiella pneumoniae/clasificación , Klebsiella pneumoniae/genética , Klebsiella pneumoniae/aislamiento & purificación , beta-Lactamasas/metabolismo
14.
Open Forum Infect Dis ; 11(8): ofae414, 2024 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-39113829

RESUMEN

Background: The independent effects of extranasal-only carriage, carriage at multiple bodily sites, or the bacterial load of colonizing Staphylococcus aureus (SA) on the risk of developing SA surgical site infections and postoperative bloodstream infections (SA SSI/BSIs) are unclear. We aimed to quantify these effects in this large prospective cohort study. Methods: Surgical patients aged 18 years or older were screened for SA carriage in the nose, throat, or perineum within 30 days before surgery. SA carriers and noncarriers were enrolled in a prospective cohort study in a 2:1 ratio. Weighted multivariable Cox proportional hazard models were used to assess the independent associations between different measures of SA carriage and occurrence of SA SSI/BSI within 90 days after surgery. Results: We enrolled 5004 patients in the study cohort; 3369 (67.3%) were SA carriers. 100 SA SSI/BSI events occurred during follow-up, and 86 (86%) of these events occurred in SA carriers. The number of colonized bodily sites (adjusted hazard ratio [aHR], 3.5-8.5) and an increasing SA bacterial load in the nose (aHR, 1.8-3.4) were associated with increased SA SSI/BSI risk. However, extranasal-only carriage was not independently associated with SA SSI/BSI (aHR, 1.5; 95% CI, 0.9-2.5). Conclusions: Nasal SA carriage was associated with an increased risk of SA SSI/BSI and accounted for the majority of SA infections. Higher bacterial load, as well as SA colonization at multiple bodily sites, further increased this risk.

15.
Clin Infect Dis ; 56(4): 478-87, 2013 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-23243181

RESUMEN

BACKGROUND: The worldwide prevalence of extended-spectrum ß-lactamase (ESBL)-producing Enterobacteriaceae is increasing rapidly both in hospitals and in the community. A connection between ESBL-producing bacteria in food animals, retail meat, and humans has been suggested. We previously reported on the genetic composition of a collection of ESBL-producing Escherichia coli (ESBL-EC) from chicken meat and humans from a restricted geographic area. Now, we have extended the analysis with plasmid replicons, virulence factors, and highly discriminatory genomic profiling methods. METHODS: One hundred forty-five ESBL-EC isolates from retail chicken meat, human rectal carriers, and blood cultures were analyzed using multilocus sequence typing, phylotyping, ESBL genes, plasmid replicons, virulence genes, amplified fragment length polymorphism (AFLP), and pulsed-field gel electrophoresis (PFGE). RESULTS: Three source groups overlapped substantially when their genetic composition was compared. A combined analysis using all variables yielded the highest resolution (Wilks lambda [Λ]: 0.08). Still, a prediction model based on the combined data classified 40% of the human isolates as chicken meat isolates. AFLP and PFGE showed that the isolates from humans and chicken meat could not be segregated and identified 1 perfect match between humans and chicken meat. CONCLUSIONS: We found significant genetic similarities among ESBL-EC isolates from chicken meat and humans according to mobile resistance elements, virulence genes, and genomic backbone. Therefore, chicken meat is a likely contributor to the recent emergence of ESBL-EC in human infections in the study region. This raises serious food safety questions regarding the abundant presence of ESBL-EC in chicken meat.


Asunto(s)
Infecciones por Escherichia coli/genética , Escherichia coli/enzimología , Carne/microbiología , Factores de Virulencia/genética , beta-Lactamasas/genética , Análisis del Polimorfismo de Longitud de Fragmentos Amplificados , Animales , Pollos , Electroforesis en Gel de Campo Pulsado , Escherichia coli/aislamiento & purificación , Heces/microbiología , Humanos , Tipificación de Secuencias Multilocus/métodos , Países Bajos , Plásmidos/genética
16.
Antimicrob Agents Chemother ; 57(7): 3092-9, 2013 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-23612198

RESUMEN

We studied clinical characteristics, appropriateness of initial antibiotic treatment, and other factors associated with day 30 mortality in patients with bacteremia caused by extended-spectrum-ß-lactamase (ESBL)-producing bacteria in eight Dutch hospitals. Retrospectively, information was collected from 232 consecutive patients with ESBL bacteremia (due to Escherichia coli, Klebsiella pneumoniae, and Enterobacter cloacae) between 2008 and 2010. In this cohort (median age of 65 years; 24 patients were <18 years of age), many had comorbidities, such as malignancy (34%) or recurrent urinary tract infection (UTI) (15%). One hundred forty episodes (60%) were nosocomial, 54 (23%) were otherwise health care associated, and 38 (16%) were community acquired. The most frequent sources of infection were UTI (42%) and intra-abdominal infection (28%). Appropriate therapy within 24 h after bacteremia onset was prescribed to 37% of all patients and to 54% of known ESBL carriers. The day 30 mortality rate was 20%. In a multivariable analysis, a Charlson comorbidity index of ≥ 3, an age of ≥ 75 years, intensive care unit (ICU) stay at bacteremia onset, a non-UTI bacteremia source, and presentation with severe sepsis, but not inappropriate therapy within <24 h (adjusted odds ratio [OR], 1.53; 95% confidence interval [CI], 0.68 to 3.45), were associated with day 30 mortality. Further assessment of confounding and a stratified analysis for patients with UTI and non-UTI origins of infection did not reveal a statistically significant effect of inappropriate therapy on day 30 mortality, and these results were insensitive to the possible misclassification of patients who had received ß-lactam-ß-lactamase inhibitor combinations or ceftazidime as initial treatment. In conclusion, ESBL bacteremia occurs mostly in patients with comorbidities requiring frequent hospitalization, and 84% of episodes were health care associated. Factors other than inappropriate therapy within <24 h determined day 30 mortality.


Asunto(s)
Antibacterianos/uso terapéutico , Bacteriemia/tratamiento farmacológico , Infecciones por Enterobacteriaceae/tratamiento farmacológico , Infecciones por Enterobacteriaceae/microbiología , beta-Lactamas/uso terapéutico , Anciano , Bacteriemia/microbiología , Comorbilidad , Infección Hospitalaria/tratamiento farmacológico , Infección Hospitalaria/microbiología , Enterobacter cloacae/efectos de los fármacos , Infecciones por Enterobacteriaceae/mortalidad , Escherichia coli/efectos de los fármacos , Infecciones por Escherichia coli/tratamiento farmacológico , Infecciones por Escherichia coli/microbiología , Infecciones por Escherichia coli/mortalidad , Femenino , Humanos , Infecciones Intraabdominales , Infecciones por Klebsiella/tratamiento farmacológico , Infecciones por Klebsiella/microbiología , Infecciones por Klebsiella/mortalidad , Klebsiella pneumoniae/efectos de los fármacos , Masculino , Pruebas de Sensibilidad Microbiana , Estudios Retrospectivos , Resultado del Tratamiento , Resistencia betalactámica/genética , beta-Lactamasas/biosíntesis , beta-Lactamas/farmacología
17.
N Engl J Med ; 362(1): 9-17, 2010 Jan 07.
Artículo en Inglés | MEDLINE | ID: mdl-20054045

RESUMEN

BACKGROUND: Nasal carriers of Staphylococcus aureus are at increased risk for health care-associated infections with this organism. Decolonization of nasal and extranasal sites on hospital admission may reduce this risk. METHODS: In a randomized, double-blind, placebo-controlled, multicenter trial, we assessed whether rapid identification of S. aureus nasal carriers by means of a real-time polymerase-chain-reaction (PCR) assay, followed by treatment with mupirocin nasal ointment and chlorhexidine soap, reduces the risk of hospital-associated S. aureus infection. RESULTS: From October 2005 through June 2007, a total of 6771 patients were screened on admission. A total of 1270 nasal swabs from 1251 patients were positive for S. aureus. We enrolled 917 of these patients in the intention-to-treat analysis, of whom 808 (88.1%) underwent a surgical procedure. All the S. aureus strains identified on PCR assay were susceptible to methicillin and mupirocin. The rate of S. aureus infection was 3.4% (17 of 504 patients) in the mupirocin-chlorhexidine group, as compared with 7.7% (32 of 413 patients) in the placebo group (relative risk of infection, 0.42; 95% confidence interval [CI], 0.23 to 0.75). The effect of mupirocin-chlorhexidine treatment was most pronounced for deep surgical-site infections (relative risk, 0.21; 95% CI, 0.07 to 0.62). There was no significant difference in all-cause in-hospital mortality between the two groups. The time to the onset of nosocomial infection was shorter in the placebo group than in the mupirocin-chlorhexidine group (P=0.005). CONCLUSIONS: The number of surgical-site S. aureus infections acquired in the hospital can be reduced by rapid screening and decolonizing of nasal carriers of S. aureus on admission. (Current Controlled Trials number, ISRCTN56186788.)


Asunto(s)
Antiinfecciosos/uso terapéutico , Clorhexidina/uso terapéutico , Mupirocina/uso terapéutico , Cavidad Nasal/microbiología , Infecciones Estafilocócicas/prevención & control , Staphylococcus aureus/aislamiento & purificación , Infección de la Herida Quirúrgica/prevención & control , Administración Intranasal , Antiinfecciosos/efectos adversos , Portador Sano/tratamiento farmacológico , Causas de Muerte , Clorhexidina/efectos adversos , Infección Hospitalaria/prevención & control , Método Doble Ciego , Femenino , Mortalidad Hospitalaria , Humanos , Estimación de Kaplan-Meier , Tiempo de Internación , Modelos Logísticos , Masculino , Persona de Mediana Edad , Mupirocina/efectos adversos , Pomadas , Reacción en Cadena de la Polimerasa , Piel/microbiología , Jabones/uso terapéutico , Staphylococcus aureus/genética
18.
Eur Respir J ; 42(5): 1283-90, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23397295

RESUMEN

Our aim was to evaluate the diagnostic accuracy and clinical utility of a serotype-specific urinary antigen detection multiplex assay for identification of 13 pneumococcal serotypes (1, 3, 4, 5, 6A, 6B, 7F, 9V, 14, 18C, 19A, 19F and 23F) in urine of patients with community-acquired pneumonia. Adult patients with clinical suspicion of community-acquired pneumonia were included. In addition to standard diagnostic procedures, a urine sample was collected to perform the urinary antigen detection test. Demographic, clinical, radiological and microbiological data were collected. Among 1095 community-acquired pneumonia patients Streptococcus pneumoniae was identified as causative pathogen in 257 (23%), when using conventional diagnostic methods and in 357 (33%) when urinary antigen detection was added. Of the 49 bacteraemic episodes caused by one of the 13 serotypes covered by the urinary antigen detection, 48 were detected by the urinary antigen detection, indicating a sensitivity of 98%. Of the 77 community-acquired pneumonia episodes with a "non-urinary antigen detection" causative pathogen, none had a positive urinary antigen detection result, indicating a specificity of 100%. Addition of the urinary antigen detection test to conventional diagnostic methods increased the prevalence of S. pneumoniae community-acquired pneumonia by 39%. Using bacteraemic episodes as reference sensitivity and specificity of the urinary antigen detection was 98% and 100%, respectively.


Asunto(s)
Antígenos Bacterianos/orina , Infecciones Comunitarias Adquiridas/diagnóstico , Infecciones Comunitarias Adquiridas/orina , Neumonía Neumocócica/diagnóstico , Neumonía Neumocócica/orina , Anciano , Infecciones Comunitarias Adquiridas/inmunología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Neumonía Neumocócica/inmunología , Polisacáridos/análisis , Prevalencia , Estudios Prospectivos , Reproducibilidad de los Resultados , Sensibilidad y Especificidad
19.
Artículo en Inglés | MEDLINE | ID: mdl-37592968

RESUMEN

Surgical site infections (SSIs) are important healthcare-associated infections, leading to increased morbidity and mortality, healthcare costs, and prolonged hospital stays. Staphylococcus aureus is an important and common microbial cause of SSI. Nasal carriage of S. aureus has been shown to be an important determinant for the development of SSI, and interventions aimed at eradicating preoperative nasal carriage are associated with a reduced risk of infection. Yet, it is not entirely clear how the nasally residing S. aureus causes SSI at distant body sites. In this commentary, we describe our view on how S. aureus can be transported from the nares to the incision site during surgery. In addition, we shed light on the implications of our view for infection prevention research.

20.
Microorganisms ; 11(4)2023 Apr 20.
Artículo en Inglés | MEDLINE | ID: mdl-37110504

RESUMEN

Lyme borreliosis (LB) is not notifiable in many European countries, and accurate data on the incidence are often lacking. This study aimed to determine the seroprevalence of Borrelia burgdorferi sensu lato (s.l.)-specific antibodies in the general population of The Netherlands, and to determine risk factors associated with seropositivity. Sera and questionnaires were obtained from participants (n = 5592, aged 0-88 years) enrolled in a nationwide serosurveillance study. The sera were tested for B. burgdorferi s.l.-specific IgM and IgG antibodies using ELISA and immunoblot. Seroprevalence was estimated controlling for the survey design. Risk factors for seropositivity were analyzed using a generalized linear mixed-effect model. In 2016/2017, the seroprevalence in The Netherlands was 4.4% (95% CI 3.5-5.2). Estimates were higher in men (5.7% [95% CI 4.4-7.2]) than in women (3.1% [95% CI 2.0-4.0]), and increased with age from 2.6% (95% CI 1.4-4.4) in children to 7.7% (95% CI 5.9-7.9) in 60- to 88-year-olds. The seroprevalence for B. burgdorferi s.l. in the general population in The Netherlands was comparable to rates reported in European countries. The main risk factors for seropositivity were increasing age, being male and the tick bite frequency. The dynamics of LB infection are complex and involve variables from various disciplines. This could be further elucidated using infectious disease modelling.

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