Dissemination of Multidrug-Resistant Proteus mirabilis Clones Carrying a Novel Integron-Borne blaIMP-1 in a Tertiary Hospital.

This study aimed to characterize multidrug-resistant Proteus mirabilis clones carrying a novel class 1 integron-borne blaIMP-1 In1359 was inserted into a large conjugative plasmid that also carried blaCTX-M-2 The production of carbapenemases in Enterobacteriaceae that are intrinsically resistant to polymyxins and tigecycline is very worrisome, representing a serious challenge to clinicians and infection control teams.

Structure for prevention of health care-associated infections in Brazilian hospitals: A countrywide study.

BACKGROUND: Minimal structure is required for effective prevention of health care-associated infection (HAI). The objective of this study was to evaluate the structure for prevention of HAI in a sample of Brazilian hospitals. METHODS: This was a cross-sectional study from hospitals in 5 Brazilian regions (n = 153; total beds: 13,983) classified according to the number of beds; 11 university hospitals were used as reference for comparison. Trained nurses carried out the evaluation by using structured forms previously validated. The evaluation of conformity index (CI) included elements of structure of the Health Care-Associated Prevention and Control Committee (HAIPCC), hand hygiene, sterilization, and laboratory of microbiology. RESULTS: The median CI for the HAIPCC varied from 0.55-0.94 among hospital categories. Hospitals with >200 beds had the worst ratio of beds to sinks (3.9; P < .001). Regarding alcoholic product for handrubbing, the worst ratio of beds to dispensers was found in hospitals with <50 beds (6.4) compared with reference hospitals (3.3; P < .001). The CI for sterilization services showed huge variation ranging from 0.0-1.00. Reference hospitals were more likely to have their own laboratory of microbiology than other hospitals. CONCLUSION: This study highlights the need for public health strategies aiming to improve the structure for HAI prevention in Brazilian hospitals.

Nosocomial bloodstream infections in Brazilian pediatric patients: microbiology, epidemiology, and clinical features.

BACKGROUND: Nosocomial bloodstream infections (nBSIs) are an important cause of morbidity and mortality and are the most frequent type of nosocomial infection in pediatric patients. METHODS: We identified the predominant pathogens and antimicrobial susceptibilities of nosocomial bloodstream isolates in pediatric patients (≤16 years of age) in the Brazilian Prospective Surveillance for nBSIs at 16 hospitals from 12 June 2007 to 31 March 2010 (Br SCOPE project). RESULTS: In our study a total of 2,563 cases of nBSI were reported by hospitals participating in the Br SCOPE project. Among these, 342 clinically significant episodes of BSI were identified in pediatric patients (≤16 years of age). Ninety-six percent of BSIs were monomicrobial. Gram-negative organisms caused 49.0% of these BSIs, Gram-positive organisms caused 42.6%, and fungi caused 8.4%. The most common pathogens were Coagulase-negative staphylococci (CoNS) (21.3%), Klebsiella spp. (15.7%), Staphylococcus aureus (10.6%), and Acinetobacter spp. (9.2%). The crude mortality was 21.6% (74 of 342). Forty-five percent of nBSIs occurred in a pediatric or neonatal intensive-care unit (ICU). The most frequent underlying conditions were malignancy, in 95 patients (27.8%). Among the potential factors predisposing patients to BSI, central venous catheters were the most frequent (66.4%). Methicillin resistance was detected in 37 S. aureus isolates (27.1%). Of the Klebsiella spp. isolates, 43.2% were resistant to ceftriaxone. Of the Acinetobacter spp. and Pseudomonas aeruginosa isolates, 42.9% and 21.4%, respectively, were resistant to imipenem. CONCLUSIONS: In our multicenter study, we found a high mortality and a large proportion of gram-negative bacilli with elevated levels of resistance in pediatric patients.

Impact of the introduction of an automated microbiologic system on the clinical outcomes of bloodstream infections caused by Enterobacteriaceae strains.

INTRODUCTION: Enterobacteriaceae strains are a leading cause of bloodstream infections (BSI). The aim of this study is to assess differences in clinical outcomes of patients with BSI caused by Enterobacteriaceae strains before and after introduction of an automated microbiologic system by the microbiology laboratory. METHODS: We conducted a retrospective cohort study aimed to evaluate the impact of the introduction of an automated microbiologic system (Phoenix(tm) automated microbiology system, Becton, Dickinson and Company (BD) - Diagnostic Systems, Sparks, MD, USA) on the outcomes of BSIs caused by Enterobacteriaceae strains. The study was undertaken at Hospital São Paulo, a 750-bed teaching hospital in São Paulo, Brazil. Patients with BSI caused by Enterobacteriaceae strains before the introduction of the automated system were compared with patients with BSI caused by the same pathogens after the introduction of the automated system with regard to treatment adequacy, clinical cure/improvement and 14- and 28-day mortality rates. RESULTS: We evaluated 90 and 106 patients in the non-automated and automated testing periods, respectively. The most prevalent species in both periods were Klebsiella spp. and Proteus spp. Clinical cure/improvement occurred in 70% and 67.9% in non-automated and automated period, respectively (p = 0.75). 14-day mortality rates were 22.2% and 30% (p = 0.94) and 28-day mortality rates were 24.5% and 40.5% (p = 0.12). There were no significant differences between the two testing periods with regard to treatment adequacy, clinical cure/improvement and 14- and 28-day mortality rates. CONCLUSIONS: Introduction of the BD Phoenix(tm) automated microbiology system did not impact the clinical outcomes of BSIs caused by Enterobacteriaceae strains in our setting.

Estratégias de implantação dos controles ambientais para prevenir a disseminação da tuberculose hospitalar / Estrategias para la implementacion de controles ambientales en la prevencion de la propagacion de la tuberculosis en los establecimientos de salud / Strategies for implementation of environmental controls to prevent the spread of tuberculosis in health-care settings

A transmissão intra-hospitalar da tuberculose consisteemumproblemade saúde ocupacional, e as medidas de controleefetivas incluem os controles ambientais que visam prevenir a disseminação dessa doença e reduzir as partículasinfecciosas aéreas. Trata-se de um estudo descritivo, realizado como objetivo de descrever a estrutura necessária paraimplantar e operacionalizar uma unidade de isolamento para tuberculose com pressão negativa do ar. A unidade foiprojetada comumsistema de climatização comcontrole de temperatura de 22±2 oC, recirculação do ar, filtragem HEPA,20 trocas de ar por hora e pressão negativa. Após a reforma da unidade e a implantação dos controles ambientais,o funcionamento do isolamento respiratório foi monitorizado por 12 meses. As ocasiões em que a pressão negativase tornou neutra foram identificadas pelos manômetros nos quartos e nos filtros, indicando a saturação deles e suasubstituição. Em seguida, a pressão negativa foi restabelecida. O investimento para a implantação do isolamento foide 75 mil dólares e o custo mensal de manutenção, 550 dólares. A unidade requer gerenciamento apropriado paraassegurar a proteção dos profissionais da saúde e demais pacientes.

Thenosocomial transmission of tuberculosis is a seriousoccupational health problem.Aneffectiveprevention of this diseaseincludes environmental measures to avoid its dissemination and to reduce the amount of droplet nuclei in the air. It is adescriptive study that aimed to describe the necessary structure for the implementation of an isolation roomwith negativeair pressure for patients with tuberculosis. The units were projected with HVAC system with temperature control at 22±2ºC, air recirculation system, HEPA filters, twenty two air changes per hour and negative air pressure. After repairs and theimplementation of the environmental control the functioning of the respiratory isolation wasmonitored for 12months. Inthe event of the negative air pressure becoming neutral the manometers in the room would display the filters saturationlevel and the need for their replacement. Soon after that the negative air pressure could be restarted. The isolation unitimplementationrequiredaninvestmentofUS$75,000.00 being themonthly repaircostUS$550.00.Therespiratoryisolationunit requires specific management strategies so as to ensure the protection of healthcare workers and patients.

La transmisión intrahospitalaria de la tuberculosis es un problema de salud en el trabajo y las medidas efectivas decontrol incluyen controles ambientales destinados a prevenir la diseminación de la enfermedad y reducir la cantidadde partículas infecciosas en el aire. Este estudio se realizó con el objetivo de describir la estructura necesaria paraimplementar y operar una unidad de aislamiento para la tuberculosis con presión de aire negativa. La unidad fuediseñada con un sistema de climatización con control de temperatura de 22 ± 2 ° C, recirculación del aire, filtros HEPA,veinte cambios de airepor horaypresión negativa. Después del proceso de reforma e implementación de los controlesambientales, el funcionamiento del aislamiento respiratorio fue monitoreado durante doce meses. Las ocasiones enque la presión negativa se convirtió en neutra fueron identificadas por manómetros en las habitaciones y en los filtros,señalando saturación y necesidad de sustitución. En seguida, la presión negativa fue restablecida. La inversión parainstalar el aislamiento fue de U$S 75.000,00yel costodemantenimiento mensual es de U$S 550,00. La unidad requiereestrategias de gestión adecuadas para garantizar la protección de los profesionales de la salud y de los pacientes.

Prevalence and clinical outcomes of episodes of ventilator-associated pneumonia caused by SPM-1-producing and non-producing imipenem-resistant Pseudomonas aeruginosa.

INTRODUCTION: Pseudomonas aeruginosa is a leading cause of ventilator-associated pneumonia (VAP) and exhibits high rates of resistance to several antimicrobial drugs. The carbapenens are usually the drugs of choice against this microorganism. However, the carbapenem resistance has increased among these strains worldwide. The presence of metallo-ß-lactamases (MBL) has been pointed out as a major mechanism of resistance among these strains. No previous study addressed outcomes of respiratory infections caused by these strains. METHODS: Our group sought to analyze the epidemiology and clinical outcomes of patients with VAP caused by imipenem-resistant P. aeruginosa. A total of 29 clinical isolates of carbapenem-resistant Pseudomonas aeruginosa were screened for metallo-ß-lactamase (MBL) genes. RESULTS: Demographic and clinical variables were similar between the SPM-1-producing and non-SPM-1-producing group. Five (17.2%) isolates were positive for blaSPM-1. No other MBL gene was found. All patients were treated with polymyxin B. The infection-related mortality was 40% and 54.2% for SPM-1-producing and -non-producing isolates, respectively. CONCLUSIONS: There were no differences in epidemiological and clinical outcomes between the two groups.

Prevalence and clinical outcomes of episodes of ventilator-associated pneumonia caused by SPM-1-producing and non-producing imipenem-resistant Pseudomonas aeruginosa / Prevalência e evolução clínica de episódios de pneumonia associada à ventilação mecânica causada por Pseudomonas aeruginosa resistente a imipenem produtoras e não-produtoras de SPM-1

INTRODUCTION: Pseudomonas aeruginosa is a leading cause of ventilator-associated pneumonia (VAP) and exhibits high rates of resistance to several antimicrobial drugs. The carbapenens are usually the drugs of choice against this microorganism. However, the carbapenem resistance has increased among these strains worldwide. The presence of metallo-β-lactamases (MBL) has been pointed out as a major mechanism of resistance among these strains. No previous study addressed outcomes of respiratory infections caused by these strains. METHODS: Our group sought to analyze the epidemiology and clinical outcomes of patients with VAP caused by imipenem-resistant P. aeruginosa. A total of 29 clinical isolates of carbapenem-resistant Pseudomonas aeruginosa were screened for metallo-β-lactamase (MBL) genes. RESULTS: Demographic and clinical variables were similar between the SPM-1-producing and non-SPM-1-producing group. Five (17.2 percent) isolates were positive for blaSPM-1. No other MBL gene was found. All patients were treated with polymyxin B. The infection-related mortality was 40 percent and 54.2 percent for SPM-1-producing and -non-producing isolates, respectively. CONCLUSIONS: There were no differences in epidemiological and clinical outcomes between the two groups.

INTRODUÇÃO: Pseudomonas aeruginosa é uma importante causa de pneumonia associada à ventilação mecânica (PAV) e exibe altas taxas de resistência a vários antimicrobianos. Os carbapenens são usualmente as drogas de escolha para esse microorganismo. Contudo, a resistência a carbapenens tem crescido entre essas amostras em todo o mundo. A presença de metalo- β-lactamase (MBL) tem sido apontado como um importante mecanismo de resistência nessas cepas. Nenhum estudo prévio avaliou desfechos clínicos de infecções respiratórias causadas por essas amostras MÉTODOS: Nosso grupo analisou a epidemiologia e evolução clínica de episódios de PAV causada por P. aeruginosa resistente a imipenem. Um total de vinte e nove isolados clínicos de Pseudomonas aeruginosa resistente a carbapenem foram avaliados quanto à presença de genes para metalo-β-lactamase (MBL). RESULTADOS: Variáveis clínicas e demográficas foram similares entre o grupo produtor de SPM-1 e o não-produtor. Cinco (17,2 por cento) isolados foram positivos para blaSPM-1. Nenhum outro gene para MBL foi encontrado. Todos os pacientes foram tratados com polimixina B. A mortalidade relacionada à infecção foi de 40 por cento e 50 por cento respectivamente para os isolados produtores de SPM-1 e não-produtores de SPM-1. CONCLUSÕES: Nao houve diferença entre os dados epidemiológicos e a evolução clínica entre os dois grupos.

Risk factors for catheter-related bloodstream infection: a prospective multicenter study in Brazilian intensive care units.

INTRODUCTION: Central venous catheters (CVC) are devices of great importance in health care. The advantages gained from the use of catheters outweigh the complications that might result from their use, among which bloodstream infections (BSI). In spite of its importance, few national studies have addressed this issue. OBJECTIVE: The aim this study was to determine the incidence of BSI in patients with CVC, hospitalized in ICU, as well as the variables associated with this complication. METHODS: Multicentric cohort study carried out at ICUs of three hospitals at Universidade Federal de São Paulo complex. RESULTS: A total of 118 cases of BSI in 11.546 catheters day were observed: 10.22 BSI per 1,000 catheters day. On average, BSI was associated to seven additional days of hospital stay in our study (p < 0.001), with a significant difference between types of catheters. Concerning the place of insertion, there was no statistical difference in BSI rates. CONCLUSION: We concluded that a patient who uses a catheter for longer than 13 days presents a progressive risk for infection of approximately three times higher in relation to a patient who uses the catheter for less than 13 days (p < 0.001). The median duration of catheter use was 14 days among patients with BSI and 9 days in patients without infection (p < 0.001). There was higher prevalence of gram-negative infections. The risk factors for BSI were utilization of multiple-lumen catheters, duration of catheterization and ICU length of stay.

Risk factors for catheter-related bloodstream infection: a prospective multicenter study in Brazilian intensive care units

INTRODUCTION: Central venous catheters (CVC) are devices of great importance in health care. The advantages gained from the use of catheters outweigh the complications that might result from their use, among which bloodstream infections (BSI). In spite of its importance, few national studies have addressed this issue. OBJECTIVE: The aim this study was to determine the incidence of BSI in patients with CVC, hospitalized in ICU, as well as the variables associated with this complication. METHODS: Multicentric cohort study carried out at ICUs of three hospitals at Universidade Federal de São Paulo complex. RESULTS: A total of 118 cases of BSI in 11.546 catheters day were observed: 10.22 BSI per 1,000 catheters day. On average, BSI was associated to seven additional days of hospital stay in our study (p < 0.001), with a significant difference between types of catheters. Concerning the place of insertion, there was no statistical difference in BSI rates. CONCLUSION: We concluded that a patient who uses a catheter for longer than 13 days presents a progressive risk for infection of approximately three times higher in relation to a patient who uses the catheter for less than 13 days (p < 0.001). The median duration of catheter use was 14 days among patients with BSI and 9 days in patients without infection (p < 0.001). There was higher prevalence of Gram-negative infections. The risk factors for BSI were utilization of multiple-lumen catheters, duration of catheterization and ICU length of stay.

Nosocomial bloodstream infections in Brazilian hospitals: analysis of 2,563 cases from a prospective nationwide surveillance study.

Nosocomial bloodstream infections (nBSIs) are an important cause of morbidity and mortality. Data from a nationwide, concurrent surveillance study, Brazilian SCOPE (Surveillance and Control of Pathogens of Epidemiological Importance), were used to examine the epidemiology and microbiology of nBSIs at 16 Brazilian hospitals. In our study 2,563 patients with nBSIs were included from 12 June 2007 to 31 March 2010. Ninety-five percent of BSIs were monomicrobial. Gram-negative organisms caused 58.5% of these BSIs, Gram-positive organisms caused 35.4%, and fungi caused 6.1%. The most common pathogens (monomicrobial) were Staphylococcus aureus (14.0%), coagulase-negative staphylococci (CoNS) (12.6%), Klebsiella spp. (12.0%), and Acinetobacter spp. (11.4%). The crude mortality was 40.0%. Forty-nine percent of nBSIs occurred in the intensive-care unit (ICU). The most frequent underlying conditions were malignancy, in 622 patients (24.3%). Among the potential factors predisposing patients to BSI, central venous catheters were the most frequent (70.3%). Methicillin resistance was detected in 157 S. aureus isolates (43.7%). Of the Klebsiella sp. isolates, 54.9% were resistant to third-generation cephalosporins. Of the Acinetobacter spp. and Pseudomonas aeruginosa isolates, 55.9% and 36.8%, respectively, were resistant to imipenem. In our multicenter study, we found high crude mortality and a high proportion of nBSIs due to antibiotic-resistant organisms.