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Resumen Introduccion Descripcion clinica y epidemiologica de un brote en una unidad de cuidados intensivos (UCI) causado por Enterobacter cloacae complex multirresistente productor de una β-lactamasa de espectro extendido (BLEE) tipo CTX-M-9. Metodos Se realizo un estudio retrospectivo de las caracteristicas clinicas y epidemiologicas del brote causado por E. cloacae complex. La identificacion y estudio de sensibilidad de las cepas fueron realizados mediante el sistema semiautomatico BD Phoenix™, y la caracterizacion de la BLEE, por PCR y secuenciacion. La tipificacion molecular se realizo mediante electroforesis en gel de campo pulsado (PFGE). Resultados Durante febrero de 2014, 6 pacientes (50% mujeres; media de edad: 61,5 anos; rango de edad: 44-76 anos) ingresados en la UCI del Complejo Hospitalario de Pontevedra (CHOP) presentaron aislamientos de E. cloacae complex resistente a cefalosporinas de amplio espectro. Tres pacientes desarrollaron infeccion; uno presento bacteriemia primaria y shock septico, y 2 neumonia asociada a ventilacion mecanica. En los 3 casos restantes los aislamientos de E. cloacae complex se consideraron colonizacion. El analisis fenotipico y genotipico revelo que todos los aislados presentaban el mismo perfil por PFGE y que portaban la misma BLEE del tipo CTX-M-9. El brote se controlo mediante la mejora de las medidas universales y el aislamiento de contacto de los pacientes infectados y/o colonizados. Conclusion Se describe desde un punto de vista clinico y epidemiologico un brote de E. cloacae complex portador de CTX-M-9 en una UCI.

An outbreak of acute gastroenteritis due to staphylococcal food poisoning occurred in July 2011 at a summer school held by a sports club in Barcelona (Catalonia, Spain). Of the 42 cases involved, 20 were hospitalised. To identify the outbreak source, a retrospective cohort study was performed on the group at risk, which included 73 summer school students and 18 staff members. Food exposure at the sports club restaurant was identified as the most relevant common link among the study cohort. Although the preliminary microbiological investigation suggested that enterotoxigenic Staphylococcus aureus (S. aureus) infections were the possible source, enterotoxin types A and D were identified, quantified and confirmed in the different biological samples collected. A descriptive, in-depth epidemiological and clinical investigation subsequently pointed to food intoxication rather than bacterial infection as being the cause of the outbreak. Molecular investigation of the strain isolates, using pulsed-field gel electrophoresis typing, revealed that all eight strains of S. aureus had the same profile and spa type (t008). Samples of the incriminated foods, i.e., boiled macaroni, tuna and fresh tomatoes, specimens of vomit of those affected, and bilateral fingernail scrapings and nasal swabs of food handlers were shown to be the common source of transmission of the contamination. Following the outbreak, appropriate hygiene and control measures could be implemented to prevent any recurrence. (C) 2013 Published by Elsevier Ltd.

Clinical and epidemiological description of an outbreak in an intensive care unit (ICU) caused by a strain of multidrug-resistant Enterobacter cloacae complex carrying a CTX-M-9-type extended-spectrum β-lactamase (ESBL).A retrospective study of the clinical and epidemiological features of the outbreak caused by E.cloacae complex was performed. Identifying and studying the sensitivity of the strains were performed using the semi-automated system BD Phoenix™, and the characterisation of ESBL using PCR and sequencing. Molecular typing was performed by pulsed-field gel electrophoresis (PFGE).During February 2014, 6 patients (50% women; mean age: 61.5 years; age range: 44-76 years) admitted to the ICU of the Hospital of Pontevedra (CHOP) presented resistant E.cloacae complex isolates to extended-spectrum cephalosporins. Three patients developed infection; one had primary bacteraemia and septic shock, and 2 with ventilator-associated pneumonia. In the remaining three cases E.cloacae complex isolates were considered as colonisation. Phenotypic and genotypic analysis revealed that all isolates had the same PFGE profile and carried the same CTX-M-9 ESBL. The outbreak was controlled by improving universal precautions and contact isolation of patients infected and/or colonized.The clinical and epidemiological features of an outbreak in an ICU caused by E.cloacae complex carrying CTX-M-9 are described.

The aim of this study was to assess the epidemiology and molecular basis of the infection and dissemination of multidrug-resistant Acinetobacter baumannii (MDRAB) in three sequential outbreaks at the intensive care units (ICUs) of a tertiary university hospital in Granada, Spain, between 2009 and 2011. Strains from all patients infected and/or colonized by MDRAB during outbreak periods were characterized using PFGE and multilocus sequence typing (MLST). The first outbreak appeared in the summer of 2009 involving 38 ICU patients: 25 from a Traumatology-Rehabilitation hospital (TRH) and 13 from a Medical-Surgery hospital (MSH). Between 2010 and 2011, outbreaks were limited to the MSH-ICU, affecting 9 and 11 patients, respectively. Two PFGE types were detected. In the 2009 outbreak, two clones were identified: profile 1 strains were isolated at the TRH, whilst profile 2 was isolated at the MSH. Only one clone was identified in the 2010 and 2011 outbreaks: the profile 2 clone detected at the MSH in 2009. After MLST analysis, a single sequence type (ST92) was identified. This suggested that an endemic strain could evolve and cause localized outbreaks in vulnerable patients. Multiplex PCR for OXA group enzymes yielded a positive result for blaOXA-58-like and blaOXA-51-like genes, and gene sequencing showed the presence of blaOXA-58. However, the absence of ISAba1 upstream of the blaOXA-51-like gene suggested the absence of OXA-51 expression. The susceptibility pattern was not an appropriate method for MDRAB surveillance, as several susceptibility patterns were identified in a single clone. Consequently, molecular methods of characterization are recommended for epidemiological surveillance of MDRAB.