Anti-microbial sensitivity of enterobacteria identified in community-acquired urinary tract infection in pregnant women in 9 Colombian hospitals / Susceptibilidad antimicrobiana de enterobacterias identificadas en infección urinaria adquirida en la comunidad, en gestantes en nueve hospitales de Colombia

ABSTRACT Objective: To identify sensitivity profiles of the main anti-microbial agents used in the management of community-acquired urinary tract infection in pregnant women, and to make the molecular characterisation in order to confirm the existence of bacterial resistance in this population group. Materials and methods: Descriptive crosssectional study that included pregnant women with community-acquired urinary tract infection requiring admission to hospital. They were part of a study conducted in the general population. The microbiological results of the urine cultures were analysed. Isolates of Escherichia coli, Klebsiella spp. And Proteus mirabilis were identified over a period of 12 months in 9 Colombian hospitals, and their sensitivity profiles were determined using microdilution broth and gradient diffusion tests, and the presence of extended spectrum beta-lactamases was characterised using microbiological and molecular methods.The sociodemographic and clinical characteristics of these patients are presented. Results: Overall, 74 isolates were collected (64 E. coli, 7 Klebsiella spp. and 3 P. mirabilis isolates) in 73 patients. Prior use of antibiotics was documented in 58% of the patients. Resistance to ampicillin/sulbactam, cefazolin and ceftriaxone was 15.6%, 17.2% and 4.7%, respectively. There was extended spectrum beta-lactamase expression in three of the isolates, 2 of E. coli and 1 of Klebsiella spp. (3.1% E. coli and 14.3% Klebsiella spp.) One E. coli isolate expressed enzymes of the AmpC type. Conclusion: The presence of resistant strains to antibiotics used as first-line empirical treatment and to third-generation cephalosporins was confirmed in enterobacteria responsible for community-acquired urinary tract infection in pregnant women, produced by type CTX M-15 and AmpC extended spectrum betalactamase enzymes.

RESUMEN Objetivo: determinar los perfiles de susceptibilidad a los principales agentes antimicrobianos utilizados en el manejo de infección de vías urinarias adquirida por gestantes en la comunidad, y caracterizarlos molecularmente para confirmar la existencia de resistencia bacteriana en este grupo poblacional. Materiales y métodos: Estudio de corte transversal, descriptivo, en el que se incluyeron gestantes con infección urinaria adquirida en la comunidad que requirieron hospitalización. Estas hacían parte de un estudio realizado en población general. Se analizaron los resultados microbiológicos de los urocultivos. Se identificaron los aislamientos de Escherichia coli, Klebsiella spp. y Proteus mirabilis durante 12 meses en 9 hospitales de Colombia, y se determinó su perfil de susceptibilidad por microdilución en caldo y pruebas de difusión por gradiente; se caracterizó la presencia de betalactamasas de espectro extendido, con métodos microbiológicos y moleculares. Se presentan las características sociodemográficas y clínicas de estas pacientes. Resultados: se recogieron 74 aislamientos (64 de E. coli, 7 de Klebsiella spp. y 3 de P. mirabilis) en 73 pacientes. En 58 % de las pacientes se reportó uso previo de antibióticos. La resistencia a ampicilina/sulbactam, cefazolina y ceftriaxona fue de 15,6, 17,2 y 4,7 %, respectivamente. Tres aislamientos, dos de E. coli y uno de Klebsiella spp., expresaron betalactamasas de espectro extendido (3,1 % en E. coli y 14,3 % Klebsiella spp.). Un aislamiento de E. coli expresó enzimas tipo AmpC. Conclusión: se confirmó la presencia de cepas resistentes a antibióticos utilizados de primera línea de manera empírica, y a cefalosporinas de tercera generación en enterobacterias responsables de infección del tracto urinario adquirida en la comunidad en embarazadas, producida por enzimas de tipo betalactamasas de espectro extendido tipo CTX M-15 y AmpC.

[Antimicrobial susceptibility profile in urinary pathogens causing community-acquired infections in diabetic patients in Colombia].

INTRODUCTION: Urinary tract infection is the most common pathology in diabetic patients, and an important determinant of morbidity and mortality among them. The increasing resistance of uropathogens acquired in the community to commonly used antibiotics is alarming. OBJECTIVE: To identify the profile of antibiotic susceptibility of uropathogens responsible for communityacquired infections among diabetic patients in hospitals in Colombia. MATERIALS AND METHODS: We conducted a descriptive study in a subgroup of diabetic patients in the framework of a larger study in adults with urinary tract infection acquired in the community. Over one year, we collected Escherichia coli, Klebsiella spp. and Proteus mirabilis isolates from nine hospitals in Colombia. Their susceptibility profile was determined using microbiological and molecular methods to establish the presence of extended-spectrum AmpC betalactamases and KPC carbapenemases. RESULTS: We collected 68 isolates (58 E. coli, nine Klebsiella spp. and one Proteus mirabilis). Four (6.9%) of the E. coli isolates expressed extended spectrum betalactamases, two (3.4%) of them belonged to the phylogenetic group B2 and to ST131 clone and expressed the TEM-1 and CTM-X-15 betalactamases. The AmpC phenotype was found in four (6.9%) of the E. coli isolates, three of which produced TEM-1 and CMY-2 betalactamases. One K. pneumoniae isolate expressed the KPC-3 carbapenemase. CONCLUSION: The presence of extended spectrum betalactamases and carbapenemases in uropathogens responsible for community-acquired infection was confirmed in diabetic patients.

Perfil de sensibilidad antimicrobiana de microorganismos causantes de infecciones urinarias adquiridas en la comunidad en pacientes con diabetes mellitus en Colombia / Antimicrobial susceptibility profile in urinary pathogens causing community-acquired infections in diabetic patients in Colombia

Resumen Introducción. La infección de las vías urinarias es la más frecuente en pacientes diabéticos, y es un factor determinante de la morbilidad y la mortalidad en este grupo de pacientes. El aumento de la resistencia de los microorganismos adquiridos en la comunidad a los antibióticos comúnmente utilizados para combatirla es alarmante. Objetivo. Determinar el perfil de sensibilidad a los antibióticos de los microorganismos responsables de infecciones urinarias adquiridas en la comunidad en pacientes diabéticos atendidos en algunos hospitales de Colombia. Materiales y métodos. Se hizo un estudio descriptivo de un subgrupo de pacientes diabéticos en el marco de una investigación en adultos con infección de origen comunitario de las vías urinarias. Durante un año, se recolectaron aislamientos de Escherichia coli, Klebsiella spp. y Proteus mirabilis en nueve hospitales de Colombia y se determinó su perfil de sensibilidad mediante métodos microbiológicos y moleculares, para establecer la presencia de betalactamasas de espectro extendido del tipo AmpC y de carbapenemasas del tipo KPC. Resultados. Se recolectaron 68 aislamientos (58 de E. coli, nueve de Klebsiella spp. y uno de P. mirabilis). Cuatro (6,9 %) de los aislamientos de E. coli expresaron dichas betalactamasas, en dos (3,4 %) de ellos, pertenecientes al grupo filogenético B2 y al clon ST131, se detectaron las betalactamasas TEM-1 y CTM-X-15. En otros cuatro (6,9 %) aislamientos de E. coli se encontró el fenotipo AmpC, y en tres de ellos se produjeron las betalactamasas TEM-1 y CMY-2. Un aislamiento de K. pneumoniae expresó la carbapenemasa KPC-3. Conclusión. Se confirmó la presencia de cepas productoras de betalactamasas de espectro extendido y carbapenemasas en microorganismos responsables de infección urinaria adquirida en la comunidad en pacientes diabéticos.

Abstract Introduction: Urinary tract infection is the most common pathology in diabetic patients, and an important determinant of morbidity and mortality among them. The increasing resistance of uropathogens acquired in the community to commonly used antibiotics is alarming. Objective: To identify the profile of antibiotic susceptibility of uropathogens responsible for community-acquired infections among diabetic patients in hospitals in Colombia. Materials and methods: We conducted a descriptive study in a subgroup of diabetic patients in the framework of a larger study in adults with urinary tract infection acquired in the community. Over one year, we collected Escherichia coli, Klebsiella spp. and Proteus mirabilis isolates from nine hospitals in Colombia. Their susceptibility profile was determined using microbiological and molecular methods to establish the presence of extended-spectrum AmpC betalactamases and KPC carbapenemases. Results: We collected 68 isolates (58 E. coli, nineKlebsiella spp. and oneProteus mirabilis). Four (6.9%) of the E. coli isolates expressed extended spectrum betalactamases,two (3.4%) of thembelonged to the phylogenetic group B2 andto ST131 clone and expressed the TEM-1 and CTM-X-15 betalactamases. The AmpC phenotype was found in four(6.9%) of the E. coli isolates, three of which producedTEM-1 and CMY-2 betalactamases. One K. pneumoniaeisolate expressed the KPC-3 carbapenemase. Conclusion: The presence of extended spectrum betalactamases and carbapenemases in uropathogens responsible for community-acquired infection was confirmed in diabetic patients.

Emergencia de Providencia rettgeri NDM-1 en dos departamentos de Colombia, 2012-2013 / Emergence of Providencia rettgeri NDM-1 in two departments of Colombia, 2012-2013

Introducción: En Colombia, entre 2012 y 2013 se identificaron 19 aislamientos con NDM, de los cuales 14 correspondían a Providencia rettgeri. Métodos: Los aislamientos se identificaron con Vitek-2, y la sensibilidad antimicrobiana se evaluó por microdilución en caldo. Las carbapenemasas se determinaron fenotípicamente con test de Hodge modificado y pruebas de sinergia con EDTA/SMA y APB, genotípicamente por PCR usando iniciadores específicos para KPC, GES, IMP, VIM, OXA-48 y NDM, y las relaciones genéticas se establecieron con Diversilab. Resultados: Los aislamientos fueron resistentes a carbapenémicos, cefalosporinas de tercera generación, piperacilina-tazobactam, amicacina, gentamicina y tigeciclina, excepto a aztreonam. Todos los aislamientos fueron positivos para EDTA/SMA y NDM-1 y negativos para APB y otras carbapenemasas. Se definieron 2 grupos genéticos: grupo 1 (n = 9 aislamientos), grupo 2 (n = 4 aislamientos), y un aislamiento no relacionado genéticamente. Conclusión: Este trabajo describe la circulación de grupos de P. rettgeri productores de NDM-1 en Colombia (AU)

Introduction: In Colombia, between 2012 and 2013, 19 isolates with NDM were identified, of which 14 corresponded to Providencia rettgeri. Methods: The isolates were identified by Vitek-2, and antimicrobial susceptibility was evaluated by broth microdilution. The carbapenemase phenotypes were determined with Modified Hodge Test and synergy tests with EDTA/SMA and APB, the genotypes by PCR using specific primers for KPC, GES, IMP, VIM, OXA-48 and NDM, and genetic relationships were established with DiversiLab. Results: The isolates were resistant to carbapenems, third-generation cephalosporins, piperacillintazobactam, amikacin, gentamicin and tigecycline, except aztreonam. All isolates were positive for EDTA/SMA and NDM-1, and negative for APB and other carbapenemases. Two genetic groups, group 1 (n = 9 isolates), group 2 (n = 4 isolates) and an isolate defined as not genetically related. Conclusion: This work describes the circulating of NDM-1-producing P. rettgeri in Colombia (AU)

Emergence of Providencia rettgeri NDM-1 in two departments of Colombia, 2012-2013. / Emergencia de Providencia rettgeri NDM-1 en dos departamentos de Colombia, 2012-2013.

INTRODUCTION: In Colombia, between 2012 and 2013, 19 isolates with NDM were identified, of which 14 corresponded to Providencia rettgeri. METHODS: The isolates were identified by Vitek-2, and antimicrobial susceptibility was evaluated by broth microdilution. The carbapenemase phenotypes were determined with Modified Hodge Test and synergy tests with EDTA/SMA and APB, the genotypes by PCR using specific primers for KPC, GES, IMP, VIM, OXA-48 and NDM, and genetic relationships were established with DiversiLab. RESULTS: The isolates were resistant to carbapenems, third-generation cephalosporins, piperacillin-tazobactam, amikacin, gentamicin and tigecycline, except aztreonam. All isolates were positive for EDTA/SMA and NDM-1, and negative for APB and other carbapenemases. Two genetic groups, group 1 (n=9 isolates), group 2 (n=4 isolates) and an isolate defined as not genetically related. CONCLUSION: This work describes the circulating of NDM-1-producing P. rettgeri in Colombia.