Determination of antimicrobial and modulatory activity of bacterial resistance by nettle (Cnidoscolus urens) extracts in multiresistant bacteria isolated from bovine mastitis.

The present study aimed to evaluate the antimicrobial and modulating activity of the ethanol extract obtained from the leaves, stems, and roots of Cnidoscolus urens in multiresistant bacteria. The Minimum Inhibitory Concentration (MIC) values obtained for the extracts of leaves, stems, and roots were greater than 1024 µg/mL for all isolates. In the antimicrobial resistance modulation test, the extract of the leaves of C. urens showed a better modulating effect than that of the stems and roots for gentamicin, highlighting the reduction of MIC for Escherichia coli, Lactococcus garvieae and Staphylococcus sciuri. For erythromycin, a reduction of MIC was observed in L. garvieae, Staphylococcus aureus, Staphylococcus epidermidis, and Streptococcus agalactiae. The extract from the leaves of C. urens has an important modulating effect on resistance in multiresistant bacteria, especially with gentamicin and erythromycin.

Spread analysis of glanders in the state of Piauí, northeastern Brazil.

Brazil is strategic in controlling neglected zoonoses, such as glanders, in its territory. Among the Brazilian states, Piauí is a strategic state for the spread of the disease in the country. The present study aimed to evaluate the spatial and temporal distribution of official cases of glanders in Piauí between 2015 and 2022. The glanders cases were located in the municipalities of the north and central-north mesoregions, mainly in Campo Maior, Teresina and Altos. The highest incidence risk (IR) occurred in of Altos (IR = 257.9), Sussuapara (IR = 158.4), and Teresina (IR = 157.7). A primary cluster was formed with a relative risk of 14.88 between 2019 and 2022, encompassing 34 municipalities in the north and central-north regions. In Piauí, glanders is well localized, with the potential for spread across borders. This is the first study demonstrating the distribution of reported cases of glanders in the state of Piauí.

A systematic review of the microbial community in taiassuids: a One Health approach.

Collared and white-lipped peccaries are sympatric and are distributed in most of South America and in the humid tropical forests of Mexico and Central America. Historically, these species have been used as a source of protein by traditional and/or indigenous human communities, but currently they have been used for legal consumption in different countries. Thus, there has been greater interaction between these wild species and domestic animals and humans, enabling microbial interactions between different niches. The present study presents a systematic review of the literature on the microbial community of collared peccaries and white-lipped peccaries distributed throughout the world, focusing on experimental studies related to the detection of microorganisms as well as the prevalence of the animal species and its characterization of the studied population, in situ or ex situ. Seventy-two studies were selected, mainly in South American countries, related to different species of microorganisms isolated or serologically detected (viruses, bacteria, fungi, and parasites), either as microbiota, pathogens or commensals, many of which are of zoonotic interest, such as Leptospira, Toxoplasma, Brucella, among others. Therefore, these wild mammals are characterized as sentinel agents of anthropic action and require the implementation of studies in relation to their contribution to the spread of microorganisms, being a potential source of amplification and transmission of pathogens.

Acute aflatoxicosis outbreak in rheas (Rhea americana) in Brazil: Case report.

Aflatoxins are mycotoxins capable of contaminating food, and can cause toxic effects, teratogenicity, mutagenicity, carcinogenicity, and immune system depression. The presence of fungi which produce this metabolite in ingredients that compose the animal feed increased the risk of the emergence of aflatoxicosis. The objective of this study was to report an aflatoxicosis outbreak in rheas (Rhea americana) from a farm in Teresina, PI, Brazil, fed with commercial feed. After the deaths of four animals, epidemiological data were collected and complementary examinations were performed, including necropsy, histopathology, parasitology, blood culture, in addition to the analysis of the presence of toxins in the birds' feed. The diagnosis was based on the acute clinical signs, necropsy findings, which included carcass jaundice, an oedematous, yellowish, friable liver of increased size, and histopathological findings of moderate to severe congestion in all organs. The parasitological and microbiological tests performed were negative, not indicating systemic infectious causes. The analysis of the presence of mycotoxins revealed the existence of Aflatoxins B1, B2 and G1 in the commercial feed supplied, constituting a total of 66.89 µg/kg. This amount of aflatoxin exceeds the maximum level allowed by the Brazilian legislation. To our knowledge this is the first report of aflatoxicosis in rheas, and emphasizes the importance of the diagnosis, control, and prevention of mycotoxins in the quality of food provided to animals kept ex situ.

Antimicrobial, modulatory, and antibiofilm activity of tt-farnesol on bacterial and fungal strains of importance to human health.

In this study, we analyzed the antimicrobial, antibiofilm, and modulatory activities of trans-trans-farnesol (tt-farnesol). The minimum inhibitory concentration (MIC) of this sesquiterpene was evaluated against 31 Gram-positive and Gram-negative bacterial strains and 4 species of the genus Candida. Furthermore, we examined its inhibitory action on biofilm production as well as antibiotic modulation. Only Gram-positive species presented susceptibility to tt-farnesol (MIC ranging from 8 µg/mL to 128 µg/mL). No synergistic or antagonistic effects were observed between tt-farnesol (1/4 and 1/8 of MIC) and first-choice antibiotics against multidrug resistant strains. However, the modulatory action of tt-farnesol (1/2 and 1/4 of the MIC) decreased 8 × MIC of non-inhibitory ß-lactam antibiotic against a Methicillin-resistant strain. In the antibiofilm assay, tt-farnesol inhibited biofilm formation, especially in Methicillin-resistant Staphylococcus aureus (MRSA) strains, at concentrations ranging from 2 µg/mL to 128 µg/mL. Additionally, in the molecular docking study, the tt-farnesol molecule demonstrated a remarkable binding affinity with important proteins involved in the biofilm production, such as IcaA and Srt proteins. The antimicrobial action of tt-farnesol on Streptococcus pyogenes and Streptococcus agalactiae strains was evaluated for the first time, presenting an MIC of 16 µg/mL for both strains. Our findings reveal the antibacterial, antibiofilm, and modulatory potential of tt-farnesol to aid in the fight against infectious processes.

Avaliação in vitro da adsorção de aflatoxina B1 por produtos comerciais utilizados na alimentação animal / In vitro evaluation of aflatoxin B1 adsorption by commercial products used in animal feed

Objetivou-se avaliar a capacidade de adsorção in vitro de aflatoxina B1 (AFB1) por produtos comerciais utilizados na alimentação animal. Muitas pesquisas estão sendo realizadas para a descontaminação de AFB1 em alimentos. Os produtos comerciais utilizados frequentemente na alimentação de peixes, disponíveis na forma de probióticos, são formados por cepas de bactérias e leveduras utilizadas na maioria dos ensaios de adsorção de micotoxinas. Foram utilizados três produtos comerciais: A, composto por Bacillus subtilis, Bifidobacterium bifidum, Enterococcus faecium e Lactobacillus acidophilus; B, por leveduras secas de Saccharomyces cerevisiae provenientes de cervejaria; e C, por Bacillus subtilis, Bacillus licheniformis e Bacillus pumilus. Cinco suspensões da dose máxima recomendada pelo fabricante de cada produto (0; 25; 50; 75 e 100%) foram testadas contra AFB1 (1000 ng.mL-1) em microtubos para determinação da capacidade de adsorção. Para simular o pH do estômago e do intestino de tilápias do Nilo (Oreochromis niloticus) foram formuladas soluções tampão fosfato salino (PBS), com pH 1,5 e 7,5; respectivamente. Os microtubos foram introduzidos em uma centrífuga com agitação mecânica, a 37ºC por 1 h e depois centrifugados por 10 min a 14.000 rpm; os sobrenadantes foram quantificados por cromatografia líquida de alta eficiência. Os produtos comerciais, nas concentrações máximas, foram capazes de adsorver AFB1 em quantidades de 45,01 a 129,59; 123,90 a 215,59 e 209,98 a 370,73 ng.mL-1, respectivamente. Concluiu-se que todos os produtos comerciais analisados adsorvem AFB1 em condições simuladas de pH gastrointestinal e são candidatos potenciais para adsorção de AFB1 para futuros ensaios in vivo.(AU)

The aim of this study was to evaluate the aflatoxin B1 (AFB1) adsorption capacity, in vitro, by commercial products used in animal feed. Many studies are being conducted for the decontamination of aflatoxins in feed. The commercial products destined to fish feed that are available as probiotics and are formed by strains of bacteria and yeasts used in most mycotoxins adsorption assays. Three commercial products were studied: A, consisting of Bacillus subtilis, Bifidobacterium bifidum, Enterococcus faecium and Lactobacillus acidophilus; B, consisting of dry yeast of Saccharomyces cerevisiae from brewery; and C, consisting of Bacillus subtilis, Bacillus licheniformis and Bacillus pumilus. Five suspensions of the maximum dose recommended by the manufacturer of each product (0; 25; 50; 75 and 100%) were tested against AFB1 (1000 ng.mL-1) in microtubes to determine the adsorption capacity. To simulate the pH of the stomach and intestine of the Nile tilapia (Oreochromis niloticus), phosphate buffered saline solutions (PBS) at pH 1.5 and 7.5, respectively, were formulated. Microtubes were introduced into a centrifuge with mechanical agitation at 37ºC for 1 h and then centrifuged for 10 min at 14.000 rpm; the supernatants were quantified by high-performance liquid chromatography. The commercial products in the maximum concentration were capable of adsorbing AFB1 in amounts from 45.01 to 129.59; from 123.90 to 215.59; and from 209.98 to 370.73 (ng.mL-1), respectively. It was concluded that all commercial products, which are added to animal feed, adsorbed AFB1 under simulated gastrointestinal pH conditions and are potential candidates for AFB1 adsorption for future in vivo studies.(AU)

Avaliação in vitro da adsorção de aflatoxina B1 por produtos comerciais utilizados na alimentação animal / In vitro evaluation of aflatoxin B1 adsorption by commercial products used in animal feed

The aim of this study was to evaluate the aflatoxin B1 (AFB1) adsorption capacity, in vitro, by commercial products used in animal feed. Many studies are being conducted for the decontamination of aflatoxins in feed. The commercial products destined to fish feed that are available as probiotics and are formed by strains of bacteria and yeasts used in most mycotoxins adsorption assays. Three commercial products were studied: A, consisting of Bacillus subtilis, Bifidobacterium bifidum, Enterococcus faecium and Lactobacillus acidophilus; B, consisting of dry yeast of Saccharomyces cerevisiae from brewery; and C, consisting of Bacillus subtilis, Bacillus licheniformis and Bacillus pumilus. Five suspensions of the maximum dose recommended by the manufacturer of each product (0; 25; 50; 75 and 100%) were tested against AFB1 (1000 ng.mL-1) in microtubes to determine the adsorption capacity. To simulate the pH of the stomach and intestine of the Nile tilapia (Oreochromis niloticus), phosphate buffered saline solutions (PBS) at pH 1.5 and 7.5, respectively, were formulated. Microtubes were introduced into a centrifuge with mechanical agitation at 37ºC for 1 h and then centrifuged for 10 min at 14.000 rpm; the supernatants were quantified by high-performance liquid chromatography. The commercial products in the maximum concentration were capable of adsorbing AFB1 in amounts from 45.01 to 129.59; from 123.90 to 215.59; and from 209.98 to 370.73 (ng.mL-1), respectively. It was concluded that all commercial products, which are added to animal feed, adsorbed AFB1 under simulated gastrointestinal pH conditions and are potential candidates for AFB1 adsorption for future in vivo studies.

Objetivou-se avaliar a capacidade de adsorção in vitro de aflatoxina B1 (AFB1) por produtos comerciais utilizados na alimentação animal. Muitas pesquisas estão sendo realizadas para a descontaminação de AFB1 em alimentos. Os produtos comerciais utilizados frequentemente na alimentação de peixes, disponíveis na forma de probióticos, são formados por cepas de bactérias e leveduras utilizadas na maioria dos ensaios de adsorção de micotoxinas. Foram utilizados três produtos comerciais: A, composto por Bacillus subtilis, Bifidobacterium bifidum, Enterococcus faecium e Lactobacillus acidophilus; B, por leveduras secas de Saccharomyces cerevisiae provenientes de cervejaria; e C, por Bacillus subtilis, Bacillus licheniformis e Bacillus pumilus. Cinco suspensões da dose máxima recomendada pelo fabricante de cada produto (0; 25; 50; 75 e 100%) foram testadas contra AFB1 (1000 ng.mL-1) em microtubos para determinação da capacidade de adsorção. Para simular o pH do estômago e do intestino de tilápias do Nilo (Oreochromis niloticus) foram formuladas soluções tampão fosfato salino (PBS), com pH 1,5 e 7,5; respectivamente. Os microtubos foram introduzidos em uma centrífuga com agitação mecânica, a 37ºC por 1 h e depois centrifugados por 10 min a 14.000 rpm; os sobrenadantes foram quantificados por cromatografia líquida de alta eficiência. Os produtos comerciais, nas concentrações máximas, foram capazes de adsorver AFB1 em quantidades de 45,01 a 129,59; 123,90 a 215,59 e 209,98 a 370,73 ng.mL-1, respectivamente. Concluiu-se que todos os produtos comerciais analisados adsorvem AFB1 em condições simuladas de pH gastrointestinal e são candidatos potenciais para adsorção de AFB1 para futuros ensaios in vivo.