Antimicrobial resistance (AMR), in which microbes adapt to and resist current therapies, is a well-recognised global problem that threatens to reverse gains made by modern medicine in the last decades. AMR is a complex issue; however, at its core, it is driven by the overuse and inappropriate use of antimicrobials. Socioeconomic factors have been identified as significant contributors to the emergence and exacerbation of AMR, especially in populations facing inadequate access to healthcare, poor sanitation services and high morbidity and mortality rates. Weak healthcare systems and water, sanitation and hygiene have been highlighted as fundamental risk factors for AMR emergence and transmission. Behavioural factors, such as purchasing antibiotics without a prescription from a registered healthcare professional, not completing the prescribed course or overly prolonged courses of antibiotics, using antibiotics to treat viral infections, lack of access to quality antibiotics, and the proliferation of substandard or falsified (SF) drugs, have also been identified as significant contributors to AMR. Low- and middle-income countries have a higher incidence of antibiotics being dispensed without a prescription than higher-income countries.

RESUMEN Introducción: El uso inadecuado de antibióticos contribuye al aumento de la resistencia bacteriana, las cepas resistentes son muy difíciles de tratar con los antibióticos disponibles. Objetivo: Evaluar la efectividad del tratamiento farmacológico empírico con Cefotaxima y Ceftriaxona en servicios clínicos y quirúrgicos del hospital “Dr. Benigno Sánchez” de Quillacollo, durante la gestión 2022. Metodología: Es un estudio observacional de tipo analítico, subtipo casos y controles, longitudinal prospectivo. La población fue pacientes 1395, obteniendo una muestra de 884 pacientes subdividiendo en grupos casos n=741 y controles n=126. Resultados: En el servicio quirúrgico la frecuencia entre varones y mujeres fue de 45 % y 55 % respectivamente; 73 % del total no presentó enfermedades de base, el 90 % del total tuvo una hospitalización de menos de una semana con 95 % de mejoría sin diferencia significativa entre casos y controles. En el servicio de clínico, 60 % fueron mujeres el resto varones, 50 % del total no presentó enfermedades de base, el 78 % del total tuvo una hospitalización de menos de una semana con 85 % de mejoría sin diferencia significativa entre casos y controles. Discusión: Las características sociodemográficas, el presente estudio identificó que en el servicio quirúrgico a la edad media fue 43 años, de estos 45 % fueron varones y 55 % mujeres, en cambio en el servicio clínico, la edad media fue de 55 años, 60 % mujeres el resto varones. El presente estudio identificó que, en el servicio quirúrgico, el 95 % de los casos cuentan con mejoría, sin que exista una relación entre la terapia empleada o no. En el servicio clínico se apreció un 85 % de mejoría sin que exista diferencia entre los grupos. No existe una diferencia significativa entre los grupos, en los servicios medico quirúrgicos, con respecto a la mejoría.

ABSTRACT Introduction: Inappropriate use of antibiotics contributes to the increase in bacterial resistance; resistant strains are very difficult to treat with available antibiotics. Objective: To evaluate the effectiveness of empirical pharmacological treatment with Cefotaxime and Ceftriaxone in clinical and surgical services of the “Dr. Benigno Sánchez” from Quillacollo, during the 2022 administration. Methodology: It is an observational study of analytical type, case-control subtype, prospective longitudinal. The population was 1395 patients, obtaining a sample of 884 patients, subdividing cases n=741 and controls n=126 into groups. Results: In the surgical service, the frequency among men and women was 45 % and 55 % respectively; 73 % of the total did not present underlying diseases, 90 % of the total had a hospitalization of less than one week with 95 % improvement without significant difference between cases and controls. In the clinical service, 60 % were women, the rest men, 50 % of the total did not present underlying diseases, 78 % of the total had a hospitalization of less than a week with 85 % improvement without significant difference between cases and controls. Discussion: The sociodemographic characteristics, the present study identified that in the surgical service the average age was 43 years, of these 45 % were men and 55 % women, however in the clinical service, the average age was 55 years, 60 % women the rest men. The present study identified that, in the surgical service, 95 % of the cases have improvement, without there being a relationship between the therapy used or not. In the clinical service, an 85 % improvement was seen with no difference between the groups. There is no significant difference between the groups, in medical surgical services, with respect to improvement.

RESUMEN Los aceites esenciales sirven como un sustituto viable para la utilización de antimicrobianos convencionales. En la actualidad, la distribución mundial de cepas de Streptococcuspneumoniae son resistentes a la penicilina. Esta bacteria en particular posee la capacidad de causar daño a los seres humanos. Se evalúa la eficacia antimicrobiana del timol, un compuesto activo que se encuentra en el aceite de tomillo. Se examinaron un total de 30 cepas distintas de Streptococcuspneumoniae. La metodología empleada en este estudio fue la técnica de microdilución en caldo. Los resultados revelaran que la mayoría de las cepas mostraron resultados similares tanto en las pruebas de concentración inhibitoria mínima como en las de concentración bactericida mínima. Estas alteraciones permitieron a los investigadores detectar y establecer de manera efectiva la actividad antimicrobiana del timol como una posible opción de tratamiento alternativo.

ABSTRACT Essential oils serve as a viable substitute for the use of conventional antimicrobials. Currently, the worldwide distribution of strains of Streptococcus pneumoniae are resistant to penicillin. This particular bacterium has the ability to cause harm to humans. The antimicrobial efficacy of thymol, an active compound found in thyme oil, is evaluated. A total of 30 different strains of Streptococcus pneumoniae were examined. The methodology used in this study was the broth microdilution technique. The results reveal that most of the strains showed similar results in both the minimum inhibitory concentration and minimum bactericidal concentration tests. These alterations allowed the researchers to effectively detect and establish the antimicrobial activity of thymol as a possible alternative treatment option.

Resumen Introducción : Los retrasos en el tratamiento anti microbiano adecuado de las bacteriemias prolongan la estadía hospitalaria, aumentan la mortalidad e in crementan los costos. Aún hoy en día se requiere un tiempo considerable para obtener la identificación y antibiograma de los microorganismos en los hemocul tivos positivos. El objetivo fue evaluar el impacto de la implementa ción del panel BCID2 de FilmArray® (FA) sobre el tiempo de inicio de tratamientos antimicrobianos adecuados y sobre los costos potenciales de los mismos. Métodos : Estudio observacional retrospectivo de los hemocultivos positivos de pacientes hospitalizados, procesados por FA y por metodología tradicional. Se evaluaron los cambios de antimicrobianos en base a los resultados del FA. Se calcularon los días de reducción de tratamiento antimicrobiano y el ahorro potencial en el uso de los mismos, teniendo en cuenta también los costos del FA. Resultados : Se analizaron 87 episodios de bacte riemia. En 42 (48.3%) de ellos se desescaló el trata miento a antimicrobianos de menor espectro, en 7 (8%) se escaló a antimicrobianos de mayor espectro, en 8 (9.2%) se cambió el antimicrobiano sin variar el espectro y en 30 (34.5%) no se realizaron cambios con los resultados del FA. Los cambios de antimicrobianos se realizaron en promedio 2.3 días más rápido que con los métodos convencionales. Se calculó un ahorro potencial de US$ 7408. Conclusión : La implementación del panel BCID2 de FilmArray ® permitió adecuar los tratamientos antimi crobianos más rápidamente acortando la duración de los tratamientos empíricos de amplio espectro, lo cual resultó costo-efectivo.

Abstract Introduction : Delay in initiating appropriate anti microbial therapy prolongs hospitalization, increases in-hospital mortality, and raises economic costs. Cur rently, the identification and susceptibility testing of bacteria in positive blood cultures require a considerable amount of time. The objective of this study was to assess the impact of the BCID2 FilmArray® (FA) panel on the timing of appropriate antimicrobial therapy and potential anti microbial costs. Methods : This is a retrospective observational study focused on positive blood cultures in hospitalized pa tients. FA processing was conducted concurrently with routine sample processing. Changes in antibiotic treat ments based on FA results were evaluated, and the re duction in antimicrobial therapy duration and associated cost savings were calculated. Results : Eighty-seven bacteremia episodes were ana lysed. In 42 (48%) of them antimicrobial therapy was de-escalated to narrower spectrum agents, while in 7 (8%) therapy was escalated to broader spectrum anti microbials. Additionally, in 8 (9%) antimicrobials were switched without changing spectrum and in 30 (34%) no changes were made based on FA results. Antimicrobial changes were made 2.3 days faster than with routine sample processing resulting in calculated potential sav ings of US$ 7408. Conclusion : The implementation of FA facilitated a faster administration of appropriate antimicrobial therapy, leading to a reduction in the duration of broad-spectrum empirical antimicrobial therapy and subse quent economic savings.

Abstract Introduction: The use of antimicrobials is a permanent challenge as it is constantly confronted with the ability of bacteria to develop resistance mechanisms. Objective: The objective of this research was to evaluate the antimicrobial effect of polyphenolic extracts present in Ananas comosus crown. Materials and Methods: 3.5 kg of Ananas comosus pineapple crown leaves were collected and taken to a tray dryer to reduce humidity, then, they were milled until a fine flour was obtained, for the extraction process of the oleaginous extract a Soxhlet equipment was used, using 70% ethanol as solvent, The identification of phenolic compounds was carried out by ultra-high resolution liquid chromatography with an Orbitrap mass detector. The microbiological analysis was evaluated by the standardized method of diffusion with discs using Mueller-Hinton agar, for which the Staphylococcus aureus strain (ATCC 25923) was used, using oxacillin as a positive control and DMSO as a negative control. Results: from the drying obtained, the humidity was reduced by 50%, with which the dry matter obtained was ground and used to carry out the extraction process of the oleaginous extract, obtaining 63 ml of which 27 phenolic compounds were identified. As for the microbiological analysis carried out, inhibition halos varying between 4.5 mm and 6.0 mm were observed. Conclusion: Finally, it was concluded that the polyphenols present in the extract of Ananas comosus showed antibacterial activity on Staphylococcus aureus, with a greater inhibition effect observed when a higher concentration of the extract was applied.

Resumen Introducción: La utilización de antimicrobianos es un desafío permanente ya que se enfrenta en todo momento a la capacidad de las bacterias para desarrollar mecanismos de resistencia. Objetivo: el objetivo de esta investigación fue evaluar el efecto antimicrobiano de los extractos polifenolicos presentes en la corona Ananas comosus. Materiales y Métodos: se recolectaron 3,5 kg de hojas de coronas de piña Ananas comosus para ello se llevaron a un secador de charolas, para reducir humedad, posteriormente, se realizó la molienda hasta obtener una harina fina, para el proceso de extracción del extracto oleaginoso se utilizó un equipo Soxhlet utilizando etanol al 70 % como solvente, la identificación de compuestos fenólicos se realizó por cromatografía líquida de ultra-alta resolución con detector de masas Orbitrap,el análisis microbiológico se evaluó mediante el método estandarizado de difusión con discos utilizando agar Mueller-Hinton, para lo cual se utilizó la cepa Staphylococcus aureus (ATCC 25923), utilizando como control positivo oxacilina y como control negativo (DMSO). Resultados: del secado obtenido se disminuyó la humedad en 50 %, con el cual la materia seca obtenida fue molida y utilizada para realizar el proceso de extracción del extracto oleaginoso obteniendo 63ml del cual se identificaron de 27 compuestos fenólicos. En cuanto al análisis microbiológico realizado, se observaron halos de inhibición variables entre 4,5 mm y 6,0 mm. Conclusión: finalmente se concluyó que los polifenoles presentes en el extracto de Ananas comosus presentaron actividad antibacteriana en Staphylococcus aureus observándose mayor efecto de inhibición al aplicar de mayor concentración del extracto.

Abstract Background: Antimicrobial resistance (AMR) is one of the greatest threats to global public health. Contributing to this process, among other factors, is the indiscriminate use of antimicrobials in community-acquired respiratory infections. Each country has implemented strategies to confront this growing phenomenon. The objective of this review was to determine Chilean initiatives to deal with Antimicrobial Resistance (AMR), antibiotic use and prescribing, and availability of susceptibility data, for the critical community-acquired respiratory tract infection (CA-RTI) pathogens Streptococcus pneumoniae and Haemophi/us influenzae and to spot areas where more information is needed and suggest a call to action to enhance patient clinical outcomes, through a narrative review of the literature. In Chile, antibiotics sales only occur under medical prescription; however, in later years, a new consumption associated with physician drug prescription has emerged in the community, especially for penicillin derivatives, quinolones, and macrolides. Data have shown a susceptibility reduction to amoxicillin and clavulanate combination and other antibiotics against S. pneumoniae. As a consequence, the local government proposed the National Plan on Antimicrobial Resistance 2017-2020. The new version from 2021 to 2025 led to a decreasing trend in Chile's 5. pneumoniae and H. influenzae isolates. Such results highlight the importance of the development of local guidelines.

Resumen Introducción: La resistencia a antimicrobianos (RAM), es una de las mayores amenazas para la salud pública mundial. Contribuyen a este proceso, entre otros factores, el indiscriminado uso de antimicrobianos en las infecciones respiratorias adquiridas en la comunidad. Cada país ha puesto en práctica estrategias para enfrentar este creciente fenómeno. El objetivo de esta revisión fue determinar las iniciativas chilenas para abordar la RAM, el uso y la prescripción de antimicrobianos y la disponibilidad de datos de susceptibilidad para los patógenos Streptococcuspneumoniae y Haemophilus influenzae, patógenos críticos de la infección del tracto respiratorio adquirida en la comunidad (ITRAC) y detectar las áreas donde se necesita más información y sugerir un llamado a la acción para mejorar los resultados clínicos de los pacientes, a través de una revisión narrativa de la literatura. En Chile, la venta de antimicrobianos solo se realiza bajo prescripción médica; sin embargo, en los últimos años ha surgido un nuevo consumo asociado a la prescripción de medicamentos en el ámbito comunitario por parte de los médicos, especialmente para derivados de penicilina, quinolonas y macrólidos. Los datos han demostrado una reducción de la susceptibilidad in vitro a la combinación de amoxicilina y ácido clavulánico y otros antimicrobianos frente a 5. pneumoniae. En consecuencia, el gobierno local propuso el plan nacional de resistencia antimicrobiana 2017-2020. La nueva versión de 2021 a 2025 podría explicar la tendencia decreciente de aislados de 5. pneumoniae y H. influenzae en Chile. Tales resultados destacan la importancia del desarrollo de guías locales.

ABSTRACT: The Amazonian manatee (Trichechusinunguis) is an aquatic mammal threatened with extinction. However, few studies have investigated the pathogens in this species, which may affect both animal and human health. This study aimed to evaluate the frequency, distribution, and patterns of antimicrobial susceptibility of Staphylococcus spp. and Escherichiacoli colonizing the nasal and rectal cavities of Amazonian manatees kept in captivity at the National Institute for Amazonian Research (INPA) in the state of Amazonas, Brazil. Rectal and nasal swabs from 44 manatees of different ages were used in this study. The genus Staphylococcus was isolated from the nasal swabs of 32 (72.7%) animals, with two individuals harboring more than one species of Staphylococcus. S. sciuri was the most commonly isolated species. Resistance to penicillin was observed in 13 (40.6%) isolates, more frequent than the other antimicrobials tested (P = 0.01). E. coli was isolated from the rectal swabs of all animals, with phylogroup B1 being the most frequent among the strains obtained (P = 0.0008). Four isolates (6.8%) were positive for virulence factors, three of which were classified as enterotoxigenicE. coli (ETEC) and one as enteropathogenicE. coli (EPEC). To our knowledge, this is the first study to evaluate Staphylococcus spp. and E. coli in Amazonian manatee samples. This study revealed nasal colonization by Staphylococcus spp., mainly S. sciuri, and diarrheagenicE. coli isolates, including antimicrobial-resistant strains. ABSTRACT Trichechusinunguis (Trichechusinunguis extinction However health frequency distribution spp INPA (INPA Amazonas Brazil 4 3 72.7% 727 72 7 (72.7% animals S 1 40.6% 406 40 6 (40.6% P 0.01. 001 0.01 . 0 01 0.01) E B 0.0008. 00008 0.0008 0008 0.0008) 6.8% 68 8 (6.8% factors enterotoxigenicE ETEC (ETEC enteropathogenicE EPEC. EPEC (EPEC) knowledge samples diarrheagenicE antimicrobialresistant resistant 72.7 (72.7 40.6 (40.6 00 0.0 0000 0.000 000 6.8 (6.8 (EPEC 72. (72. 40. (40. 0. 0.00 6. (6. (72 (40 (6 (7 (4 (

RESUMO: O peixe-boi amazônico (Trichechus inunguis) é um mamífero aquático ameaçado de extinção. Apesar disso, poucos estudos investigaram patógenos nessa espécie que podem impactar a saúde animal e humana. O objetivo deste estudo foi avaliar a frequência, distribuição e padrões de suscetibilidade antimicrobiana de Staphylococcus sp. e Escherichia coli pertencentes à microbiota nasal e retal de peixes-bois da Amazônia mantidos em cativeiro no Instituto Nacional de Pesquisas da Amazônia (INPA) (Amazonas, Brasil). Foram utilizados suabes retais e nasais de 44 peixes-boi de diferentes idades. O gênero Staphylococcus foi isolado do swab nasal de 32 (72,7%) animais, sendo que dois indivíduos apresentaram mais de uma espécie de Staphylococcus. S. sciuri foi a espécie mais comumente isolada. A resistência à penicilina foi observada em 13 (40,6%) isolados, sendo mais frequente do que os outros antimicrobianos testados (P = 0,01). Escherichia coli foi isolada dos suabes retais de todos os animais, sendo o filogrupo B1 o mais frequente entre as cepas obtidas (P = 0,0008). Quatro isolados (6,8%) foram positivos para fatores de virulência, três dos quais foram classificados como E. coli enterotoxigênica (ETEC) e um isolado como E. coli enteropatogênica (EPEC). Este é o primeiro estudo a avaliar Staphylococcus spp. e E. coli de amostras de peixe-boi da Amazônia. O estudo revelou colonização nasal por Staphylococcus sp., principalmente S. sciuri, e por isolados diarreiogênicos de E. coli, incluindo cepas resistentes a antimicrobianos. RESUMO peixeboi peixe boi Trichechus inunguis extinção disso humana frequência sp peixesbois peixes bois INPA (INPA Amazonas, Amazonas (Amazonas Brasil. Brasil . Brasil) 4 peixesboi idades 3 72,7% 727 72 7 (72,7% animais S 1 40,6% 406 40 6 (40,6% P 0,01. 001 0,01 0 01 0,01) B 0,0008. 00008 0,0008 0008 0,0008) 6,8% 68 8 (6,8% virulência E ETEC (ETEC EPEC. EPEC (EPEC) spp 72,7 (72,7 40,6 (40,6 00 0,0 0000 0,000 000 6,8 (6,8 (EPEC 72, (72, 40, (40, 0, 0,00 6, (6, (72 (40 (6 (7 (4 (

Abstract Objectives: Fungal infections (FI) pose a public health concern and significantly increase mortality rates, especially within Neonatal Intensive Care Units (NICU). Thus, this study aimed to investigate epidemiological indicators, risk factors, and lethality predictors associated with FI in a NICU. Methods: This study included 1,510 neonates admitted to the NICU of a reference hospital in Brazil between 2015 and 2022. Demographic data, such as sex, birth weight, gestational age, and use of invasive devices were analyzed. Results: Thirty neonates developed invasive FI, totaling 33 episodes and an incidence of 1.2 per 1,000 patient days. Candida albicans was the most frequent species (52.9 %), the bloodstream was the most affected site (78.9 %), and 72.7 % of infections occurred between 2015 and 2018. The lethality rate associated with FI was 33.3 %, and 90 % of deaths occurred within 30 days of diagnosis of infection. Weight < 750 g, prolonged hospital stay, use of parenteral nutrition, and broad-spectrum antimicrobials were independent risk factors for infection occurrence, especially glycopeptides and 4th generation cephalosporins, having a considerable role in the increase in fungal infections. Weight < 750 g was considered a significant predictor of lethality, and C. albicans had the highest lethality rate (40 %). Conclusion: These findings highlight the elevated lethality rate associated with these infections, reinforcing the importance of developing strategies to control FI within NICU. Objectives (FI rates . (NICU) Thus indicators Methods 1510 1 510 1,51 201 2022 data sex weight age analyzed Results 3 12 2 1. 1000 000 1,00 52.9 529 52 9 (52. , %) 78.9 789 78 (78. 727 72 7 72. 2018 333 33. 75 stay nutrition broadspectrum broad spectrum occurrence th cephalosporins C 40 (4 %. Conclusion (NICU 151 51 1,5 20 202 100 00 1,0 52. 5 (52 78. (78 4 ( 15 1, 10 0 (5 (7

Abstract Objective: To investigate the effectiveness of linezolid and vancomycin for the treatment of nosocomial infections in children under 12 years old. Data sources: This is a systematic review in which five randomized clinical trials about the effectiveness of linezolid and vancomycin, involving a total of 429 children with nosocomial infections, were evaluated. They were searched in scientific databases: PubMed, Bvs, and SciELO. Summary of findings: The main nosocomial infections that affected children were bacteremia, skin, and soft tissue infections followed by nosocomial pneumonia. Most infections were caused by Gram-positive bacteria, which all studies showed infections caused by Staphylococcus aureus, with methicillin-resistant S. aureus (MRSA) and methicillin-resistant coagulase-negative staphylococci strains being isolated. Both linezolid and vancomycin showed high therapeutic efficacy against different types of nosocomial infections, ranging from 84.4% to 94% for linezolid and 76.9% to 90% for vancomycin. Patients receiving linezolid had lower rates of rash and red man syndrome compared to those receiving vancomycin. However, despite the adverse reactions, antimicrobials can be safely administered to children to treat nosocomial infections caused by resistant Gram-positive bacteria. Conclusion: Both linezolid and vancomycin showed good efficacy in the treatment of bacterial infections caused by resistant Gram-positive bacteria in hospitalized children. However, linezolid stands out regarding its pharmacological safety. Importantly, to strengthen this conclusion, further clinical trials are needed to provide additional evidence. Objective 1 old sources 42 evaluated databases PubMed Bvs SciELO findings bacteremia skin pneumonia Grampositive Gram positive methicillinresistant methicillin S MRSA (MRSA coagulasenegative coagulase negative isolated 844 84 4 84.4 94 769 76 9 76.9 90 However reactions Conclusion safety Importantly conclusion evidence 8 84. 7 76.

BACKGROUND: Diabetic foot syndrome is defined as the presence of a diabetic foot ulcer (DFU) associated with neuropathy, peripheral artery disease and infection. While the use of antimicrobials in the treatment of DFU infection remains a mainstay, the choice of antimicrobial remains problematic owing to the presence of multidrug-resistant polymicrobial infections. In the South African public healthcare sector, the treatment of DFUs is based on the Standard Treatment Guidelines (STGs) and the Essential Drug List. These guidelines are developed using evidence-based medicine and are based on global susceptibility patterns rather than local susceptibility data, and may not provide the most appropriate treatment options OBJECTIVES: To determine the antimicrobial susceptibility patterns of DFUs isolated from patients visiting selected Gauteng provincial public hospitals in order to determine a clinically effective treatment protocol for the management of these infections METHODS: Sample swabs were taken from 51 DFUs using the Levine method. Each sample swab was spread onto blood agar plates and thereafter, individual pathogens were isolated. The antimicrobial susceptibility patterns of all isolated pathogens were determined using zone of inhibition measurements. Pathogens were grouped according to macromorphological characteristics as well as susceptibility patterns, and a representative isolate from each group was then identified RESULTS: A total of 51 DFU ulcer swabs from 45 patients were included in the study. From the sample swabs, a total of 445 pathogens were isolated. The most effective antimicrobial was found to be gentamicin, followed by ciprofloxacin. Amoxicillin/clavulanic acid, the first line treatment according to the STGs, was found to be ineffective for many of the isolated pathogens. The most commonly isolated pathogens were Proteus mirabilis, Enterococcus faecalis and Pseudomonas aeruginosa CONCLUSION: These findings demonstrate the urgent need to reassess the STGs and base treatment plans on local epidemiological data. This study provides valuable data on common causative pathogens in DFU infections, as well as the resistance patterns of these pathogens, forming a baseline with which to base future DFU treatment plans

Abstract: Lactic acid bacteria (LAB) are generally regarded as safe microorganisms with great potential for biopreservation. As biopreservative agents, LAB can be applied as viable cultures for the production of antimicrobial compounds or exploiting chemical agents. LAB are known for the production of a variety of antagonistic compounds, among them bacteriocins, and their antimicrobial potential is defined by the combined action of metabolites on non-desired bacteria. This work evaluates the antimicrobial activity of 7 strains of LAB isolated from raw milk and Paraguay cheese: Enterococcus faecium (M6A y M6B), Lactobacillus fermentum (M16A y M17A), Lactobacillus rhamnosus (M17B) and Lactobacillus plantarum (M18 y M21) against E. coli , S. aureus and L. monocytogenes .

Resumen: Las bacterias ácido lácticas (BAL) son microorganismos generalmente considerados como seguros y poseen una gran capacidad para la bioconservación. Como agentes bioconservantes, las BAL pueden aplicarse como cultivos viables para la producción de compuestos antimicrobianos o explotando agentes químicos. Las BAL son conocidas por la producción de una variedad de compuestos antagónicos, entre ellos la bacteriocinas, y su potencial antimicrobiano está definido por la acción combinada de los metabolitos sobre bacterias no de- seadas. En este trabajo se evalúa la actividad antimicrobiana de 7 cepas de BAL aisladas de leche cruda y queso Paraguay: Enterococcus faecium (M6A y M6B), Lactobacillus fermentum (M16A y M17A), Lactobacillus rhamnosus (M17B) y Lactobacillus plantarum (M18 y M21) frente a E. coli , S. aureus y L. monocytogenes.

Abstract: Bacteremia is a major cause of morbidity and mortality in patients with cancer and episodes of high-risk febrile neutropenia (HRFN). Objective: To identify the frequency of microorganisms isolated from blood cultures (BC) and their antimicrobial resistance (R) profile in children with HRFN, compared with the same data from previous studies of the same group. Method: Prospective, multicenter, epidemiological surveillance study of microorganisms isolated from BC in patients under 18 years of age, from 7 PINDA network hospitals, between 2016 and 2021. Results: 284 episodes of HRFN with positive BC were analyzed out of 1091 enrolled episodes (26%). Median age 7.2 years [3.0-12.3]. The main isolates were gram-negative bacilli (GNB) 49.2%, gram-positive cocci (GPC) 43.8%, and fungi 3.6%. The most frequently isolated microorganisms were viridans group Streptococci (VGS) (25.8%), Escherichia coli (19.8%), Pseudomonas spp. (11.2%), Klebsiella spp. (10.9%), and coagulase negative Staphylococci (CoNS) (10.9%). There was an increase in R to third-generation cephalosporins (p = 0.011) in GNB and to oxacillin in CoNS (p = 0.00), as well as a decrease in R to amikacin in non-fermenting GNB (p = 0.02) and to penicillin in VGS (p = 0.04). Conclusion: VGS is the main agent isolated in BC from pediatric patients with cancer and episodes of HRFN, followed by E. coli, Pseudomonas spp., and Klebsiella spp. Having epidemiological surveillance of microorganisms isolated from BC and their antimicrobial R profile is essential to favor the rational use of antimicrobials.

Resumen: Las bacteriemias son una causa importante de morbimortalidad en pacientes con cáncer y episodios de neutropenia febril de alto riesgo (NFAR). Objetivo: Determinar la frecuencia de microorganismos aislados de hemocultivos (HC) y su perfil de resistencia (R) antimicrobiana en niños con NFAR, comparado con iguales datos de estudios previos del mismo grupo. Material y Método: Estudio prospectivo, multicéntrico, de vigilancia epidemiológica de microorganismos aislados de HC en pacientes menores de 18 años, en siete hospitales de la red PINDA, 2016-2021. Resultados: Se analizaron 284 episodios de NFAR con HC positivos de 1091 episodios enrolados (26%). Mediana de edad 7,2 años [3,0-12,3]. Los aislados principales fueron bacilos gramnegativos (BGN) 49,2%, cocáceas grampositivas (CGP) 43,8% y hongos 3,6%, con mayor frecuencia de Streptococcus grupo viridans (SGV) (25,8%), Escherichia coli (19,8%), Pseudomonas spp. (11,2%), Klebsiella spp. (10,9%) y Staphylococcus coagulasa negativa (SCN) (10,9%). Hubo aumento de R a cefalosporinas de tercera generación en enterobacterales (p = 0,011) y de R a oxacilina en SCN (p = 0,00), así como disminución de R a amikacina en BGN no fermentadores (p = 0,02) y de R a penicilina en SGV (p = 0,04). Conclusión: SGV es el principal agente aislado en HC de pacientes pediátricos con cáncer y episodios de NF, seguido de E. coli, Pseudomonas spp. y Klebsiella spp. Contar con vigilancia epidemiológica de microorganismos aislados de HC y su perfil de R antimicrobiana es esencial para favorecer el uso racional de antimicrobianos.

ABSTRACT: The aim of this research was to isolate and characterize bacteria from rice crop soils to determine their prospective biotechnological potential. Therefore, seven morphologically different bacteria were isolated and their physiological characteristics, antimicrobial sensitivity and ability to degrade different substrates were determined. The bacteria grew optimally between 20 and 37 °C, at pH between 5.0 and 10.0. Regarding antimicrobial sensitivity profiles; one, three, one, one, one and one strain showed resistance to 11, 12, 8, 7 and 4 antimicrobials, respectively. Molecular identification was performed by amplification and sequencing of the 16S ribosomal genes, obtaining similarity with the genera Acinetobacter, Bacillus, Staphylococcus, Comamonas and Aeromonas. The bacteria, according to their hydrolytic activity, formed five groups: three degraded gelatin, skim milk, casein, olive oil, starch, cellulose, pectin, and tributyrin; one, olive oil and tributyrin; one, gelatin, skim milk, olive oil and tributyrin; one, gelatin, olive oil, starch, tributyrin; and one, gelatin, skim milk, casein, olive oil and tributyrin. The isolated bacteria show great potential as inoculants for the enrichment and bioremediation of agricultural soils.

RESUMEN: El objetivo de la presente investigación fue aislar y caracterizar bacterias provenientes de suelos de cultivos de arroz para determinar su potencial biotecnológico prospectivo. Para ello, se recolectaron suelos de cultivos de arrozales del distrito de Rioja, Región de San Martín, aislaron siete bacterias morfológicamente diferentes y determinaron sus características fisiológicas, sensibilidad antimicrobiana y capacidad de degradar diferentes sustratos. Las bacterias crecieron óptimamente entre 20 y 37 °C, a pH entre 5,0 y 10,0. Respecto a los perfiles de sensibilidad antimicrobiana; una, tres, una, una y una cepa presentaron resistencia a 11, 12, 8, 7 y 4 antimicrobianos, respectivamente. La identificación molecular se realizó mediante la amplificación y secuenciación de los genes ribosómicos 16S, obteniendo similitud con los géneros Acinetobacter, Bacillus, Staphylococcus, Comamonas y Aeromonas. Las bacterias, según su actividad hidrolítica, formaron cinco grupos: tres degradaron gelatina, leche descremada, caseína, aceite de oliva, almidón, celulosa, pectina, y tributirina; una, aceite de oliva y tributirina; otra, gelatina, leche descremada, aceite de oliva y tributirina; una, gelatina, aceite de oliva, almidón, tributirina; y una, gelatina, leche descremada, caseína, aceite de oliva y tributirina. Las bacterias aisladas presentan gran potencial como inoculantes para el enriquecimiento y la biorremediación de suelos agrícolas.

ABSTRACT Introduction. Inappropriate use of antimicrobials in the Intensive Care Unit (ICU) contributes to bacterial resistance. Objective. The purpose of the present study was to measure the use and type of antimicrobials in patients hospitalized in the Intensive Care Unit of the Loreto Regional Hospital (HRL). Methods. Descriptive study. We reviewed 120 medical records in ICU-HRL patients from January to June 2023. Results. Most patients used antimicrobials (74.2%), indicated for septic shock (42.7%), 1 to 3 antimicrobials (93.2%), with therapy of 1 to 3 days (45%). Of the total number of antimicrobials used, the greatest proportion were bactericides 89 (90.4%), from the cephalosporin family (33.1%) and carbapenemics (23.5%); the most commonly used drugs were ceftriaxone (26.5%) and meropenem (21.1%) by the intravenous route (90.4%). Conclusion. The highest proportion of hospitalized patients use antimicrobials of the cephalosporin and carbapenemics family.

RESUMEN Introducción. El uso inapropiado de antimicrobianos en las unidades de cuidados intensivos (UCI) contribuye a la resistencia bacteriana. Objetivo. El propósito del presente estudio fue medir el uso y tipo de antimicrobianos en los pacientes hospitalizados en la Unidad de Cuidados Intensivos del Hospital Regional de Loreto (HRL). Métodos. Estudio de tipo descriptivo. Revisamos 120 historias clínicas en pacientes de UCI-HRL desde enero a junio 2023. Resultados. La mayoría de los pacientes usaron antimicrobianos (74,2%), indicados por shock séptico (42,7%), de 1 a 3 antimicrobianos (93,2%), con terapia de 1 a 3 días (45%). Del total de antimicrobianos usados, la mayor proporción fueron bactericidas 89 (90,4%), de la familia de cefalosporinas (33,1%) y carbapenémicos (23,5%); los fármacos más empleados fueron ceftriaxona (26,5%) y meropenem (21,1%) por vía intravenosa (90,4%). Conclusión. La mayor proporción de pacientes hospitalizados usan antimicrobianos de la familia de cefalosporinas y carbapenémicos.

Biologically active compounds in most spices possess antimicrobial and other important biomedical properties. There have been huge demands for natural immunity boosters (spices and herbs), considering the recent global pandemic and challenges relating to drug-resistant pathogens. This study was designed to compare the efficacy of ginger, garlic and turmeric spices against some pathogenic microorganisms. Aqueous extraction of spices, antimicrobial sensitivity and minimum inhibitory concentration tests were done using standard microbiological methods. Bioactive compounds were estimated using the gas chromatography-mass spectrometry (GC-MS) method. Aqueous extracts of ginger inhibited the growth of all test isolates except Streptococcus pneumoniae, with inhibition zones ranging between 0.9 mm and 13.5 mm. Escherichia coli, S. pneumoniae and Haemophilus influenzae were resistant to turmeric extracts, while the extract of garlic inhibited only four of the test pathogens. Inhibition zones for turmeric ranged between 4.4 mm and 10.9 mm, while those for garlic were between 4.7 mm and 11.5 mm. All the spice extracts did not inhibit microbial growth at 10-40%. An antibiotic spectrum indicated that Bacillus sp. was resistant to all but one, nitrofurantoin, which also inhibited the growth of almost all pathogens, except H. influenzae, with zones ranging between 10.5 mm and 11.6 mm. All test pathogens were resistant to cloxacillin except E. coli (10.6 mm). The major phyto-active compounds present in ginger are 2-Butanone,4-(4-hydroxy-3-methoxyphenyl), 1,3-Cyclohexadiene and 1-(4-Hydroxy-3-methoxyphenyl). SIGNIFICANCE: Conclusively, ginger, turmeric and garlic have varied inhibitory activities against diverse organisms, indicating their antimicrobial properties; however, ginger showed a higher inhibitory effect and more diverse antimicrobial property amongst selected isolates. Furthermore, certain bioactive compounds of biomedical importance were present. We therefore recommend the use of these spices as alternative natural food preservatives against spoilage organisms, as well as potential natural sources for bioactive compounds in drug development against pathogens.