International Care programs for Pediatric Post-COVID Condition (Long COVID) and the way forward.

BACKGROUND: Pediatric Post-COVID-Condition (PPCC) clinics treat children despite limited scientific substantiation. By exploring real-life management of children diagnosed with PPCC, the International Post-COVID-Condition in Children Collaboration (IP4C) aimed to provide guidance for future PPCC care. METHODS: We performed a cross-sectional international, multicenter study on used PPCC definitions; the organization of PPCC care programs and patients characteristics. We compared aggregated data from PPCC cohorts and identified priorities to improve PPCC care. RESULTS: Ten PPCC care programs and six COVID-19 follow-up research cohorts participated. Aggregated data from 584 PPCC patients was analyzed. The most common symptoms included fatigue (71%), headache (55%), concentration difficulties (53%), and brain fog (48%). Severe limitations in daily life were reported in 31% of patients. Most PPCC care programs organized in-person visits with multidisciplinary teams. Diagnostic testing for respiratory and cardiac morbidity was most frequently performed and seldom abnormal. Treatment was often limited to physical therapy and psychological support. CONCLUSIONS: We found substantial heterogeneity in both the diagnostics and management of PPCC, possibly explained by scarce scientific evidence and lack of standardized care. We present a list of components which future guidelines should address, and outline priorities concerning PPCC care pathways, research and international collaboration. IMPACT: Pediatric Post-COVID Condition (PPCC) Care programs have been initiated in many countries. Children with PPCC in different countries are affected by similar symptoms, limiting many to participate in daily life. There is substantial heterogeneity in diagnostic testing. Access to specific diagnostic tests is required to identify some long-term COVID-19 sequelae. Treatments provided were limited to physical therapy and psychological support. This study emphasizes the need for evidence-based diagnostics and treatment of PPCC. The International Post-COVID Collaboration for Children (IP4C) provides guidance for guideline development and introduces a framework of priorities for PPCC care and research, to improve PPCC outcomes.

Photon-counting detector CT-based virtual monoenergetic reconstructions: repeatability and reproducibility of radiomics features of an organic phantom and human myocardium.

BACKGROUND: Photon-counting detector computed tomography (PCD-CT) may influence imaging characteristics for various clinical conditions due to higher signal and contrast-to-noise ratio in virtual monoenergetic images (VMI). Radiomics analysis relies on quantification of image characteristics. We evaluated the impact of different VMI reconstructions on radiomic features in in vitro and in vivo PCD-CT datasets. METHODS: An organic phantom consisting of twelve samples (four oranges, four onions, and four apples) was scanned five times. Twenty-three patients who had undergone coronary computed tomography angiography on a first generation PCD-CT system with the same image acquisitions were analyzed. VMIs were reconstructed at 6 keV levels (40, 55, 70, 90, 120, and 190 keV). The phantoms and the patients' left ventricular myocardium (LVM) were segmented for all reconstructions. Ninety-three original radiomic features were extracted. Repeatability and reproducibility were evaluated through intraclass correlations coefficient (ICC) and post hoc paired samples ANOVA t test. RESULTS: There was excellent repeatability for radiomic features in phantom scans (all ICC = 1.00). Among all VMIs, 36/93 radiomic features (38.7%) in apples, 28/93 (30.1%) in oranges, and 33/93 (35.5%) in onions were not significantly different. For LVM, the percentage of stable features was high between VMIs ≥ 90 keV (90 versus 120 keV, 77.4%; 90 versus 190 keV, 83.9%; 120 versus 190 keV, 89.3%), while comparison to lower VMI levels led to fewer reproducible features (40 versus 55 keV, 8.6%). CONCLUSIONS: VMI levels influence the stability of radiomic features in an organic phantom and patients' LVM; stability decreases considerably below 90 keV. RELEVANCE STATEMENT: Spectral reconstructions significantly influence radiomic features in vitro and in vivo, necessitating standardization and careful attention to these reconstruction parameters before clinical implementation. KEY POINTS: • Radiomic features have an excellent repeatability within the same PCD-CT acquisition and reconstruction. • Differences in VMI lead to decreased reproducibility for radiomic features. • VMI ≥ 90 keV increased the reproducibility of the radiomic features.

Prevalence of diabetes foot ulcers and associated factors among adult diabetic patients in three referral hospitals in Mogadishu, Somalia.

Background: Diabetes mellitus (DM) causes significant morbidity and mortality in sub-Saharan Africa (SSA), including Somalia. Among diabetic patients, diabetic foot ulcers (DFUs) constitute the largest proportion of admissions, amputations, and mortality. The aim of this study is to assess the prevalence of diabetic foot ulcers and subsequently determine factors associated with it among diabetic patients at three major hospitals in Somalia. Methods: An institutional-based cross-sectional study was conducted among 193 diabetic patients between August and November 2022. All eligible diabetes patients who were attending De Martini Hospital, Madina General Hospital, and Deynile General Hospital during the study period were included in the study. Patients were interviewed using a structured questionnaire. We collected demographic, clinical, and behavioral variables from all participants. A bivariate and multivariable logistic regression model was fitted to identify factors associated with diabetic foot ulcer. An odds ratio with a 95% confidence interval was computed to determine the level of significance. Result: The mean age of the study's participants was 50.9 ± 13.6 years. The prevalence of diabetic foot ulcer was 15%. Patients who were either overweight or obese (OR 4.63, CI: 2.08-10.30), had a lack of family support in managing diabetes (OR 3.33, CI: 1.74-6.36), and did not check their feet regularly were more likely to develop DFU (OR 1.99, CI:1.08-3.66). Conclusion: Increased body mass index, lack of family support, and not checking feet regularly were associated with DFUs. The high prevalence of DFUs and the plethora of needs of people with DFUs pose challenges for health care. A coordinated health care system is necessary to meet the needs of diabetic patients and prevent DFUs.

Pharmacological Property and Cytotoxic Effect Showing Antiproliferative Potency in Human Melanoma Cell Lines (A375) of Combretum racemosum P. Beauv. Leaf and Root Extracts Used in Benin.

Combretum racemosum, a plant from the Combretaceae family, is traditionally used in Benin for various health problems. However, scientific research on Beninese samples of this plant is limited. The aim of this study was to identify and assess the bioactive compounds in the plant's leaves and roots. Initial screening involved analyzing powders derived from these parts for total polyphenols, flavonoids, and both condensed and hydrolyzable tannins. The polyphenolic compounds were analyzed using HPLC-DAD-ESI-MS. To evaluate the plant's antimicrobial properties, the agar diffusion method was employed, while FRAP and DPPH assays were used to determine its antioxidant capacity. For anti-inflammatory activity, the study utilized tests for in vitro protein denaturation inhibition and in vivo acute edema induced by carrageenan. Additionally, an antiproliferative assay was conducted using the human melanoma cell line A375. The analysis revealed the presence of significant polyphenolic compounds in both the leaf and root extracts of C. racemosum. Notably, compounds like Pedunculagin, Vescalagin, Casuarictin, and Digalloyl-glucoside were abundant in the leaves, with Vescalagin being especially predominant in the roots. The study also found that the dichloromethane extracts from the leaves and roots exhibited bactericidal effects on a substantial percentage of meat-isolated strains. Moreover, the antioxidant activities of these extracts were confirmed through FRAP and DPPH methods. Interestingly, the dichloromethane root extract showed strong activity in inhibiting thermal albumin denaturation, while the water-ethanol leaf extract demonstrated significant edema inhibition. Finally, the study observed that C. racemosum extracts reduced cell viability in a dose-dependent manner, with leaf extracts showing more pronounced antiproliferative effects than root extracts. These findings highlight the potential of C. racemosum leaves and roots as sources of compounds with diverse and significant biological activities. In conclusion, C. racemosum's leaves and roots exhibit promising biological activities, highlighting their potential medicinal value.

Intra-individual comparison of coronary calcium scoring between photon counting detector- and energy integrating detector-CT: Effects on risk reclassification.

Purpose: To compare coronary artery calcium volume and score (CACS) between photon-counting detector (PCD) and conventional energy integrating detector (EID) computed tomography (CT) in a phantom and prospective patient study. Methods: A commercially available CACS phantom was scanned with a standard CACS protocol (120 kVp, slice thickness/increment 3/1.5 mm, and a quantitative Qr36 kernel), with filtered back projection on the EID-CT, and with monoenergetic reconstruction at 70 keV and quantum iterative reconstruction off on the PCD-CT. The same settings were used to prospectively acquire data in patients (n = 23, 65 ± 12.1 years), who underwent PCD- and EID-CT scans with a median of 5.5 (3.0-12.5) days between the two scans in the period from August 2021 to March 2022. CACS was quantified using a commercially available software solution. A regression formula was obtained from the aforementioned comparison and applied to simulate risk reclassification in a pre-existing cohort of 514 patients who underwent a cardiac EID-CT between January and December 2021. Results: Based on the phantom experiment, CACS PCD-CT showed a more accurate measurement of the reference CAC volumes (overestimation of physical volumes: PCD-CT 66.1 ± 1.6% vs. EID-CT: 77.2 ± 0.5%). CACS EID-CT and CACS PCD-CT were strongly correlated, however, the latter measured significantly lower values in the phantom (CACS PCD-CT : 60.5 (30.2-170.3) vs CACS EID-CT 74.7 (34.6-180.8), p = 0.0015, r = 0.99, mean bias -9.7, Limits of Agreement (LoA) -36.6/17.3) and in patients (non-significant) (CACS PCD-CT : 174.3 (11.1-872.7) vs CACS EID-CT 218.2 (18.5-876.4), p = 0.10, r = 0.94, mean bias -41.1, LoA -315.3/232.5). The systematic lower measurements of Agatston score on PCD-CT system led to reclassification of 5.25% of our simulated patient cohort to a lower classification class. Conclusion: CACS PCD-CT is feasible and correlates strongly with CACS EID-CT , however, leads to lower CACS values. PCD-CT may provide results that are more accurate for CACS than EID-CT.

Legg-Calvé-Perthes' disease. Congruent aspherity caused by physeal injury. / Enfermedad de Legg-Calvé-Perthes. Estudio de la anesfericidad congruente causada por la lesión fisaria.

INTRODUCTION: Perthes disease often produces a congruent nonspherical coxa. The most widely accepted cause is initial bone collapse, but some authors refer to physeal injury as the cause of this deformity. We analyze this elliptical process in cases of congruent nonspherical Perthes. METHODS: Retrospective case-control study of 49 unilateral class III-IV Perthes cases that were not operated on. Results were compared with 49 healthy contralateral hips. The following radiological variables were determined both in AP and lateral projection, and at 4 points in time of the disease: ovalization index (OI), arthrotrochanteric distance, intraphysial angle, physeal narrowing, presence of double epiphyseal reosification nucleus, physeal length and Reimers index. RESULTS: The initial OI was 1.7 in the early reosification phase and final OI was 2.07 at physeal closure. The OI in the control cases was invariably 1.4. There was a direct relation between a high index and the initial appearance of a double epiphyseal ossification nucleus, asymmetric physeal effacement and the increase of the intraphyseal angle in both radiographic projections. CONCLUSIONS: The elliptical process of the femoral head occurs progressively throughout the disease and not only during bone collapse. It starts in the reosification phase and ends when growth stops. The initial risk signs found were the appearance of the double nucleus of reosification, the progressive angulation of the physis and the progressive increase in the rate of ovalization.

Defining an Opioid Sparing Treatment Pathway for Chronic Abdominal Pain of Somatic and Visceral Origin: A Case Series.

Chronic non-malignant abdominal pain presents a treatment challenge for pain physicians. Treatment algorithms are often defined by single specialty and are unimodal with a dependence on opioids. We present a treatment algorithm for chronic abdominal pain using a combination of interventional therapy using transversus abdominis plane (TAP) blocks along with post injection medical management for treatment of somatic and visceral pain. This is a case series of 4 patients presenting with diverse causes of chronic abdominal pain were treated with the treatment algorithm defined below. Patients received either bilateral or unilateral TAP blocks based on pain location using a combination of 0.25% bupivicaine 10ml, 40mg triamcinolone, and clonidine 50 mcg by a single physician upon admission to our acute care hospital. Follow up treatment included a combination of gabapentin, nortriptyline, and an opioid + acetaminophen combination (hydrocodone/APAP vs. oxycodone/APAP) or continuation of the patient's outpatient opioid regimen. Pre-injection opioid milligram morphine equivalents (MME) and post-injection MME were measured as well as pain along the visual analog scale (VAS). Readmissions for pain were also noted. Patients receiving TAP blocks along with post injection medical management saw their VAS scores decrease by 68.5%. Their total daily milligram morphine equivalents (MME) consumption decreased by a mean of 68.9%. There were no readmissions for abdominal pain within the 1 year follow up period.

Supply of methionine and arginine alters phosphorylation of mechanistic target of rapamycin (mTOR), circadian clock proteins, and α-s1-casein abundance in bovine mammary epithelial cells.

Methionine (Met) and arginine (Arg) regulate casein protein abundance through alterations in activity of the mechanistic target of rapamycin complex 1 (mTORC1) signaling pathway. A potential role for the circadian clock network on the regulation of protein synthesis, partly via activity of mTORC1, has been highlighted in non-ruminants. The main objective of the study was to determine in ruminant mammary cells alterations in mRNA, protein abundance and phosphorylation status of mTORC1-related upstream targets, circadian clock proteins, and protein kinase AMP-activated catalytic subunit alpha (AMPK) in relation to α-s1-casein protein (CSN1S1) abundance in response to greater supply of Met and Arg alone or in combination. Primary bovine mammary epithelial cells (BMEC) were incubated for 12 h in a 2 × 2 arrangement of treatments with control media (ideal profile of amino acids, IPAA), or media supplemented with increased Met (incMet), Arg (incArg), or both (incMet + incArg). Data were analyzed testing the main effects of Met and Arg and their interaction. Among 7 amino acid (AA) transporters known to be mTORC1 targets, increasing supply of Arg downregulated SLC1A5, SLC3A2, SLC7A1, and SLC7A5, while increasing supply of Met upregulated SLC7A1. mRNA abundance of the cytosolic Arg sensor (CASTOR1) was lower when supply of Arg and Met alone increased. p-TSC2 (TSC complex subunit 2) was greater when the Arg supply was increased, while the phosphoralation ratio of p-AKT (AKT serine/threonine kinase 1):total (t) AKT and p-AMPK:tAMPK were lower. In spite of this, the ratio of p-mTOR:tmTOR nearly doubled with incArg but such response did not prevent a decrease in CSN1S1 abundance. The abundance of period circadian regulator 1 (PER1) protein nearly doubled with all treatments, but only incMet + incArg led to greater clock circadian regulator (CLOCK) protein abundance. Overall, data suggest that a greater supply of Met and Arg could influence CSN1S1 synthesis of BMEC through changes in the mTORC1, circadian clock, and AMPK pathways. Identifying mechanistic relationships between intracellular energy, total AA supply, and these pathways in the context of milk protein synthesis in ruminants merits further research.

Breast abscess along with pulmonary mass found in an immunocompetent patient / Absceso de mama concomitante con masa pulmonar en paciente inmunocompetente

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Infecciones en pacientes con trauma craneoencefálico en el Servicio de Politrauma: Camagüey 2013-2015 / Infections in patients with traumatic brain injury in Polytrauma Service: Camagüey 2013–2015

Fundamento: las infecciones nosocomiales o en su concepto más amplio las infecciones relacionadas con el cuidado sanitario, constituyen en la actualidad uno de los principales problemas en las unidades de cuidados intensivos. Existen varios factores que contribuyen al desarrollo de estas en los pacientes con trauma craneoencefálico, que favorecen el desarrollo de una lesión cerebral secundaria durante su período postraumático y se correlacionan con la duplicación de la mortalidad.Objetivo: caracterizar las infecciones en los pacientes con trauma craneoencefálico.Métodos: se realizó un estudio descriptivo transversal en pacientes hospitalizados en el servicio de Politrauma del Hospital Universitario Manuel Ascunce Domenech de Camagüey, desde enero 2013 hasta diciembre 2015. La población en estudio estuvo constituida por los 64 pacientes ingresados con el diagnóstico de trauma craneoencefálico, en quienes se aisló un microorganismo patógeno. Las variables estudiadas fueron: grupos de edades, sexo, necesidad de ventilación mecánica artificial, estado al egreso, estadía, microorganismos patógenos aislados y sus localizaciones.Resultados: la mayor frecuencia de los pacientes correspondió al sexo masculino y en edades entre los 48-57 años. Casi la totalidad de los comprendidos en edades entre los 48 y 57 años necesitaron ventilación mecánica artificial y fallecieron más de un tercio. Se presentaron en mayor proporción la estadía de 21 y más días, entre los microorganismos aislados el acinetobacter spp y entre las localizaciones de las infecciones adquiridas, la neumonía asociada a la ventilación mecánica artificial y la bacteriemia por catéter.Conclusiones: predominaron los pacientes del sexo masculino y del grupo de edades de 48 a 57 años, el acinetobacter spp como microorganismo aislado y la neumonía asociada a la ventilación mecánica artificial, así como la bacteriemia por catéter(AU)

Background: nosocomial infections or in its broadest concept hospital-acquired infections, are now one of the main problems in intensive care units, there are several factors contributing to the development of these infections in patients with traumatic brain injury, favoring the development of secondary brain injury during the post-traumatic period, correlating this event with the doubling of mortality rate.Objective: To characterize of nosocomial infections in patients with traumatic brain injury.Methods: a descriptive transversal study was conducted in hospitalized patients in the Polytrauma Service of the University Hospital of Camagüey Manuel Ascunce Domenech, during the period January 2013 to December 2015. The study group consisted of 64 patients admitted with the diagnosis traumatic brain injury which a pathogenic microorganism was isolated. Studied variables: age groups, gender, need for artificial mechanical ventilation, discharge status, stay, isolated pathogenic microorganisms and their localizations.Results: the highest frequency of patients belonged to male who aged between 48-57 years. Almost all of them aged between 48 and 57 years old needed artificial mechanical ventilation, and more than one third died, the stay was presented a higher frequency in patients with 21 or more days in hospital, the most frequent isolated microorganism the acinetobacter spp, and locations of the most frequent infections were the pneumonia associated to mechanical ventilation artificially and catheter bacteremia.Conclusions: there was a prevalence of male patients corresponding to the age group from 48-57 years old. The most frequent findings were the acinetobacter spp as isolated microorganism and pneumonia associated to artificial mechanical ventilation as well as catheter bacteremia(AU)

Infecciones en pacientes con trauma craneoencefálico en el Servicio de Politrauma: Camagüey 2013-2015 / Infections in patients with traumatic brain injury in Polytrauma Service: Camagüey 2013-2015

Fundamento: las infecciones nosocomiales o en su concepto más amplio las infecciones relacionadas con el cuidado sanitario, constituyen en la actualidad uno de los principales problemas en las unidades de cuidados intensivos. Existen varios factores que contribuyen al desarrollo de estas en los pacientes con trauma craneoencefálico, que favorecen el desarrollo de una lesión cerebral secundaria durante su período postraumático y se correlacionan con la duplicación de la mortalidad. Objetivo: caracterizar las infecciones en los pacientes con trauma craneoencefálico. Métodos: se realizó un estudio descriptivo transversal en pacientes hospitalizados en el servicio de Politrauma del Hospital Universitario Manuel Ascunce Domenech de Camagüey, desde enero 2013 hasta diciembre 2015. La población en estudio estuvo constituida por los 64 pacientes ingresados con el diagnóstico de trauma craneoencefálico, en quienes se aisló un microorganismo patógeno. Las variables estudiadas fueron: grupos de edades, sexo, necesidad de ventilación mecánica artificial, estado al egreso, estadía, microorganismos patógenos aislados y sus localizaciones. Resultados: la mayor frecuencia de los pacientes correspondió al sexo masculino y en edades entre los 48-57 años. Casi la totalidad de los comprendidos en edades entre los 48 y 57 años necesitaron ventilación mecánica artificial y fallecieron más de un tercio. Se presentaron en mayor proporción la estadía de 21 y más días, entre los microorganismos aislados el acinetobacter spp y entre las localizaciones de las infecciones adquiridas, la neumonía asociada a la ventilación mecánica artificial y la bacteriemia por catéter. Conclusiones: predominaron los pacientes del sexo masculino y del grupo de edades de 48 a 57 años, el acinetobacter spp como microorganismo aislado y la neumonía asociada a la ventilación mecánica artificial, así como la bacteriemia por catéter.

Background: nosocomial infections or in its broadest concept hospital-acquired infections, are now one of the main problems in intensive care units, there are several factors contributing to the development of these infections in patients with traumatic brain injury, favoring the development of secondary brain injury during the post-traumatic period, correlating this event with the doubling of mortality rate. Objective: To characterize of nosocomial infections in patients with traumatic brain injury. Methods: a descriptive transversal study was conducted in hospitalized patients in the Polytrauma Service of the University Hospital of Camagüey Manuel Ascunce Domenech, during the period January 2013 to December 2015. The study group consisted of 64 patients admitted with the diagnosis traumatic brain injury which a pathogenic microorganism was isolated. Studied variables: age groups, gender, need for artificial mechanical ventilation, discharge status, stay, isolated pathogenic microorganisms and their localizations. Results: the highest frequency of patients belonged to male who aged between 48-57 years. Almost all of them aged between 48 and 57 years old needed artificial mechanical ventilation, and more than one third died, the stay was presented a higher frequency in patients with 21 or more days in hospital, the most frequent isolated microorganism the acinetobacter spp, and locations of the most frequent infections were the pneumonia associated to mechanical ventilation artificially and catheter bacteremia. Conclusions: there was a prevalence of male patients corresponding to the age group from 48-57 years old. The most frequent findings were the acinetobacter spp as isolated microorganism and pneumonia associated to artificial mechanical ventilation as well as catheter bacteremia.

Titanium dioxide food additive (E171) induces ROS formation and genotoxicity: contribution of micro and nano-sized fractions.

Since 1969, the European Union approves food-grade titanium dioxide (TiO2), also known as E171 colouring food additive. E171 is a mixture of micro-sized particles (MPs) and nano-sized particles (NPs). Previous studies have indicated adverse effects of oral exposure to E171, i.e. facilitation of colon tumour growth. This could potentially be partially mediated by the capacity to induce reactive oxygen species (ROS). The aim of the present study is to determine whether E171 exposure induces ROS formation and DNA damage in an in vitro model using human Caco-2 and HCT116 cells and to investigate the contribution of the separate MPs and NPs TiO2 fractions to these effects. After suspension of the particles in Hanks' balanced salt solution buffer and cell culture medium with either bovine serum albumin (BSA) or foetal bovine serum, characterization of the particles was performed by dynamic light scattering, ROS formation was determined by electron spin/paramagnetic resonance spectroscopy and DNA damage was determined by the comet and micronucleus assays. The results showed that E171, MPs and NPs are stable in cell culture medium with 0.05% BSA. The capacity for ROS generation in a cell-free environment was highest for E171, followed by NPs and MPs. Only MPs were capable to induce ROS formation in exposed Caco-2 cells. E171, MPs and NPs all induced single-strand DNA breaks. Chromosome damage was shown to be induced by E171, as tested with the micronucleus assay in HCT116 cells. In conclusion, E171 has the capability to induce ROS formation in a cell-free environment and E171, MPs and NPs have genotoxic potential. The capacity of E171 to induce ROS formation and DNA damage raises concerns about potential adverse effects associated with E171 (TiO2) in food.

Food-grade titanium dioxide exposure exacerbates tumor formation in colitis associated cancer model.

Colorectal cancer is the fourth worldwide cause of death and even if some dietary habits are consider risk factors, the contribution of food additives including foodgrade titanium dioxide (TiO2), designated as E171, has been poorly investigated. We hypothesized that oral E171 intake could have impact on the enhancement of colorectal tumor formation and we aimed to investigate if E171 administration could enhance tumor formation in a colitis associated cancer (CAC) model. BALB/c male mice were grouped as follows: a) control, b) E171, c) CAC and d) CAC + E171 group (n = 6). E171 used in this study formed agglomerates of 300 nm in water. E171 intragastric administration (5 mg/kg body weight/5 days/10 weeks) was unable to induce tumor formation but dysplastic alterations were observed in the distal colon but enhanced the tumor formation in distal colon (CAC + E171 group) measured by tumor progression markers. Some E171 particles were internalized in colonic cells of the E171 and CAC + E171 groups and both groups showed a decrease in goblet cells in the distal colon. However the CAC + E171 group showed a higher decrease of these cells that act as protection barrier in colon. These results suggest that E171 could worsen pre-existent intestinal diseases.

Effect of Lactobacillus sp. isolates supernatant on Escherichia coli O157: H7 enhances the role of organic acids production as a factor for pathogen control / Efeito do sobrenadante de isolados de Lactobacillus sp. sobre Escherichia coli O157: H7 reforça o papel da produção de ácidos orgânicos como fator de controle patogênico

Many attempts have been made to establish the control of foodborne pathogens through Lactobacillus isolates and their metabolism products with success being obtained in several situations. The aim of this study was to investigate the antagonistic effect of eight Lactobacillus isolates, including L. casei subsp. pseudoplantarum, L. plantarum, L. reuteri and L. delbrueckii subsp. delbrueckii, on the pathogenic Escherichia colistrain O157:H7. The inhibitory effect of pure cultures and two pooled cultures supernatants of Lactobacillus on the growth of pathogenic bacteria was evaluated by the spot agar method and by monitoring turbidity. Antimicrobial activity was confirmed for L. reuteri and L. delbrueckii subsp. delbrueckii and for a pool of lactic acid bacteria. The neutralized supernatant of the pool exerted a higher antimicrobial activity than that of the individual strains. Furthermore, D-lactic acid and acetic acid were produced during growth of the Lactobacillus isolates studied.(AU)

Muitas tentativas têm sido feitas para se estabelecer o controle de patógenos de origem alimentar através do uso de estirpes de Lactobacillus e dos seus produtos de metabolismo, com sucesso sendo sucedido em várias situações. O objetivo deste trabalho foi investigar o efeito antagônico do sobrenadante de culturas de oito isolados de Lactobacillus, incluindo L. casei subsp. pseudoplantarum, L. plantarum L. reuteri e L. delbrueckii subsp. delbrueckii, sobre Escherichia coli amostra O157:H7. Os efeitos inibidores de culturas puras e de dois "pools" de cultura de Lactobacillus sobre o crescimento da bactéria foram avaliados através do método de inibição em ágar e através do monitoramento da turbidez da cultura bacteriana. A atividade antimicrobiana foi confirmada para Lactobacillus reuteri e Lactobacillus delbrueckii subsp. delbrueckii e para o "pool" de bactérias acido-láctica. O sobrenadante neutralizado do "pool" de Lactobacillus exerceu uma atividade antimicrobiana mais elevada do que aquela das estirpes individuais. Além disso, ácido D-láctico e ácido acético foram produzidos durante o crescimento dos Lactobacillus estudados(AU)