Pathogenic Properties Research Articles

Coccidiosis cases in cattle in Turkey

Coccidiosis is a protozoan disease of the Eimeriidae family, mostly caused by Eimeria species, sometimes Isospora species, seen in all domestic and wild animals, especially in young animals, which can result in hemorrhagic diarrhea, depression, weakening, weight loss, and sometimes death. Eimeria bovis, E. zuernii, E. auburnensis, E. ellipsoidalis, and E. alabamensis cause clinical coccidiosis by showing pathogenic properties. The disease is more important for young people. In its diagnosis, the age of the animal, the hygienic condition of the environment and clinical signs are evaluated. Clinical findings and stool consistency in calves and calves are also important in diagnosis. In the treatment of coccidiosis is based on the principles of killing the causative agent or preventing its development, eliminating fluid loss, and treating secondary infections. The treatment of coccidiosis in calves naturally infected with E. zuernii and E. bovis, oral administration of 15mg/kg dose of toltrazuril is reported to be very effective and reduces economic losses by positively affecting the growth performance of animals. In studies conducted in our country, 11 Eimeria and 1 Isospora species have been found in cattle. In studies on bovine coccidiosis in Turkey, the prevalence of Eimeria species in calves and calves was found to be 16-93.3%. In line with the results obtained, it has been observed that coccidiosis continues to be a problem even in cattle farms with relatively good care and feeding conditions in Turkey. It was concluded that routine checks should be made in the enterprises, necessary precautions should be taken and hygiene rules should be followed.

Pathogenicity of non-pigmented and pigmented isolates of P. aeruginosa during long-term storage

The aim: to study the pathogenicity of non-pigmented P. aeruginosa isolates compared to those that synthesize pigment during long-term storage for broiler chickens. Materials and methods. Bacteriological studies were carried out in accordance with generally accepted methods. Initially, P. aeruginosa and other bacterial microflora were isolated from poultry farms, pathological material from poultry. The type of microorganisms was identified using Bergey's identifier. The obtained isolates were examined by morphological characteristics (according to Gram), tincture, cultural, biochemical, pathogenic properties and sensitivity of selected cultures to antibiotics were studied. After the expiration of 3 years, the main biological properties of the isolates were monitored. To establish pathogenic properties, a bioassay was performed on white mice and one-week-old broiler chickens of the Cobb 500 cross (intraperitoneally by washout from daily agar culture at a dose of 0.2 cm3, which corresponds to the previously established LD50). The results. With parenteral infection by washout from agar daily culture of pigmentless isolates at a dose of LD50, chickens died within the first - second day, in this case 87.50 % of the cultures showed pathogenicity. Experimental parenteral infection with washings from a daily culture of pigmented isolates of P. aeruginosa at a dose of LD50 led to the death of one-week-old chickens within 24-48 hours, in this case 75.00 % of the isolates showed pathogenicity. Clinical and pathological signs of infection with pigmented and non-pigmented P. aeruginosa isolates were similar. Conclusions. A comparative analysis of cases of pathogenicity of non-pigmented and pigmented isolates of P. aeruginosa on one-week-old broiler chickens of the Cobb-500 cross was carried out. In the experiment, we found that among the non-pigmented isolates, compared to the pigmented pathogenic isolates, 12.5 % more were detected in chickens. This emphasizes the importance of differential diagnosis for pseudomonosis, because infection with non-pigmented strains often goes undiagnosed

Immunogenicity of Recombinant Lipid-Based Nanoparticle Vaccines: Danger Signal vs. Helping Hand.

Infectious diseases are a predominant problem in human health. While the incidence of many pathogenic infections is controlled by vaccines, some pathogens still pose a challenging task for vaccine researchers. In order to face these challenges, the field of vaccine development has changed tremendously over the last few years. For non-replicating recombinant antigens, novel vaccine delivery systems that attempt to increase the immunogenicity by mimicking structural properties of pathogens are already approved for clinical applications. Lipid-based nanoparticles (LbNPs) of different natures are vesicles made of lipid layers with aqueous cavities, which may carry antigens and other biomolecules either displayed on the surface or encapsulated in the cavity. However, the efficacy profile of recombinant LbNP vaccines is not as high as that of live-attenuated ones. This review gives a compendious picture of two approaches that affect the immunogenicity of recombinant LbNP vaccines: (i) the incorporation of immunostimulatory agents and (ii) the utilization of pre-existing or promiscuous cellular immunity, which might be beneficial for the development of tailored prophylactic and therapeutic LbNP vaccine candidates.

The Effect of Mice Adaptation Process on the Pathogenicity of Influenza A/South Africa/3626/2013 (H1N1)pdm09 Model Strain.

Influenza virus strain A/South Africa/3626/2013 (H1N1)pdm09 (SA-WT) is a non-mouse-adapted model strain that has naturally high pathogenic properties in mice. It has been suggested that the high pathogenicity of this strain for mice could be due to the three strain-specific substitutions in the polymerase complex (Q687R in PB1, N102T in PB2, and E358E/K heterogeneity in PB2). To evaluate the role of these replacements, SA-WT was passaged five times in mouse lungs, and the genome of the mouse-adapted version of the SA-WT strain (SA-M5) was sequenced. SA-M5 lost E358E/K heterogeneity and retained E358, which is the prevalent amino acid at this position among H1N1pdm09 strains. In addition, in the hemagglutinin of SA-M5, two heterogeneous substitutions (G155G/E and S190S/R) were identified. Both viruses, SA-M5 and SA-WT, were compared for their toxicity, ability to replicate, pathogenicity, and immunogenicity in mice. In mice infected with SA-M5 or SA-WT strains, toxicity, virus titer in pulmonary homogenates, and mouse survival did not differ significantly. In contrast, an increase in the immunogenicity of SA-M5 compared to SA-WT was observed. This increase could be due to the substitutions G155G/E and S190S/R in the HA of SA-M5. The prospects for using SA-M5 in studying the immunogenicity mechanisms were also discussed.

Cell pleomorphism and changes in the enzymatic profile of selected Candida albicans strains in interaction with Escherichia coli – pilot study

Interactions between C. albicans and the microbiota play an important role in maintaining the balance between commensal and pathogenic organisms. Although the exact role of bacteria in reducing the pathogenicity of yeast remains poorly understood, a few examples have been documented so far: probiotics administration effectively reduces the formation of biofilm and bacterial metabolites inhibit the formation of hyphae.The aim of the study was to analyze C. albicans virulence levels based on the changes in the morphological structure and enzymatic profile in experimental cultures mixed with Escherichia coli. Viable cell abundance, cell pleomorphism and enzymatic profile were analyzed in single and mixed cultures (C. albicans + E. coli).The microscope analysis showed a large decrease in the number of viable C. albicans cells in mixed cultures with E. coli from 485.3±132.1 immediately after the establishment of the culture to 238.1±71.2 after an hour of incubation and 24.4±5.4 after 24 h. The length of C. albicans cells differed significantly between the single-species cultures and the mixed cultures for 24 h. Our present findings indicate a significant reduction in the secretion of several enzymes by fungi following contact with E. coli, including acid phosphatase, N-acetyl-β-glucosaminidase, naphthol-AS-BI-phosphohydrolase and leucine arylamidase.The interactions between fungi and bacteria appear to be extremely complex. On the one hand, during C. albicans with E. coli co-incubation, the bacteria stimulated the elongation of yeast cells, leading to the formation of a filamentous form; however, the number of yeast cells and their enzymatic activity decreased significantly. Therefore, it can be concluded that while E. coli stimulates some pathogenic properties, e.g. cell elongation, it also inhibits other virulence features, e.g. enzymatic activity of C. albicans.

Analysis of oral microbiome diversity in Alzheimer’s disease patients from Kazakhstan

AbstractBackgroundRecent studies have suggested that periodontal disease and alterations in the oral microbiome may be associated with cognitive decline and the development of Alzheimer’s disease (AD). Here, we report a pilot case‐control study of oral microbiota diversity in AD patients in comparison with healthy seniors from the Central Asian region.MethodWe have characterized the bacterial taxonomic composition of the oral microbiome from AD patients (n = 69) compared to the healthy group (n = 72) using 16S ribosomal RNA sequencing.ResultOur analysis showed that the oral microbiome of AD has a higher microbial diversity. More importantly, differences across taxonomic groups are distinguished by the diversity of opportunistic flora in the AD group. We identified differences between phyla and genera in bacterial abundance, including a decrease in the Firmicutes/Bacteroidetes ratio in the microbiome of AD participants. LEfSe allowed determining an enrichment at the Genus Pseudomonas, Prevotella_9, UCG_002, Esherichia_Shigella, Mogibacterium, Ralstonia, and Bergeyella in the AD group. A significant increase in the genus Mogibacterium, which is also associated with an aggressive form of periodontitis and type 2 diabetes mellitus, was revealed. The genus Ralstonia are commensal representatives of the oral microbiome, but with a reduced immune system they exhibit pathogenic properties and are associated with a higher risk of mortality in hematological malignancies and hereditary disorders of hematopoiesis. One of the least studied Bergeyella spp, which is a representative of the oral microbiome of dogs, cats, and pigs, therefore, it is isolated on contact and is associated with the risk of preterm birth, as well as the development of endocarditis in a weakened body.ConclusionOur results confirm that the oral microbiome is a potential target for therapeutic intervention in AD. However, a comprehensive picture of the full composition of the oral microbiome in patients with AD requires further investigation.

METABOLIC CHANGES IN BURNS DURING ORAL ADMINISTRATION OF AEROCOCCUS VIRIDANS IN UNCOMFORTABLE TEMPERATURE CONDITIONS

The organism of farm animals is in an inextricable connection with the environment, with which there is a constant exchange of substances, energy and information, that is, it is an open metabolic system that depends on the conditions of existence. Therefore, it is very important to create the most favorable technologies for exploiting the physiological capabilities of animals in conditions of physiological well-being and epidemiological well-being. This is the foundation for obtaining high-quality and bio-safe animal husbandry products. One of the common negative factors of violations of the physiological needs of the animal body is the effect of low-intensity permanent stress of multivalent etiology. During the development of negative pathophysiological disorders, the quantitative and qualitative composition of the microbiota of the large intestine changes, as a dynamic microbial community of transient and resident populations that develop according to the chemo-static principle of functioning. Restoration and correction of the microbiota of the large intestine and transformation of the disturbed equilibrium of the interpopulation ratio is an effective means of eliminating the negative effects of stress on the animal body. The resident probiotic microflora is represented by a wide variety of prokaryotic microbiota and many reference strains are used for therapeutic and prophylactic purposes. Aerococcus viridans is very promising and effective, which lives in various biotopes of the macro-organism and is an indicator of the physiological well-being of the organism, because it is sensitive to toxic compounds and antimicrobial substances, but with permanent use it exhibits pronounced antagonistic properties against transient microflora with potentially pathogenic properties due to inhibition of their colonization abilities and exhibits detoxification potentials. Ants were used to simulate low-intensity permanent stress. as heat-loving animals sensitive to uncomfortable temperatures of the external environment and placed them in a household refrigerator for ten days at a temperature of 6-8 oC. Probiotic culture of production strain BI-07 Aerococcus viridans in a dose of 2×109 CFU/cm3 was administered orally as an anti-stress factor. A similar experiment was conducted in comfortable conditions, that is, at a temperature of 20-22 oC. Metabolic changes in the body of ants were recorded during a laboratory blood test. Probiotic culture does not affect the normergic processes of the macro-organism and does not change indicators beyond the physiological norm, but when used in conditions of low-intensity temperature stress, it has a positive effect on the adaptation-compensatory mechanisms of the macro-organism and shows protective potential in relation to non-resident microbiota.

Mycobacterium tuberculosis Rv2653 Protein Promotes Inflammation Response by Enhancing Glycolysis.

Mycobacterium tuberculosis (M.tb) infection causes the communicable disease tuberculosis (TB), a major disease and one of the leading causes of death worldwide. The protein encoded by the region of deletion (RD) in M.tb mediates the pathogenic properties of M.tb by inducing an inflammatory response or disrupting host cell metabolism. We cloned and purified the Rv2653 protein from RD13 to explore its regulatory effects on host macrophages. We found that Rv2653 promoted glycolysis and upregulated the expression of key glycolytic enzymes, namely, hexokinase 2 (HK2) and lactate dehydrogenase-A (LDHA) in human leukemia monocytic (THP1) cells. Furthermore, the induction of glycolysis by Rv2653 contributes to the activation of the nucleotide-binding domain, leucine-rich-containing family, pyrin domain-containing-3 (NLRP3) inflammasome. Rv2653 activated the mammalian target of rapamycin complex 1 (mTORC1) signaling pathway, and the mTORC1 inhibitor NR1 blocked Rv2653-induced HK2, LDHA, and NLRP3 expression. siRNA interfering with HK2 or LDHA significantly inhibited the activation of NLRP3 inflammasome by Rv2653, blocked Rv2653-triggered inflammatory factors interleukin (IL)-1β, IL-6, tumor necrosis factor (TNF)-α, reactive oxygen species (ROS), and nitric oxide (NO), and promoted the survival of Bacillus Calmette-Guerin (BCG) in THP1 cells. Overall, Rv2653 promoted glycolysis by activating the mTORC1 signaling pathway, activating the NLRP3 inflammasome, and releasing inflammatory factors, ultimately inhibiting the intracellular survival of BCG in THP1 cells. Therefore, we revealed that anti-M.tb immune mechanisms induced by Rv2653 contribute to the development of new anti-TB strategies.

Comparative study of virulence potential, phylogenetic origin, CRISPR-Cas regions and drug resistance of Escherichia coli isolates from urine and other clinical materials

IntroductionUrinary tract infections (UTI), among which the main etiological factor is uropathogenic Escherichia coli (UPEC, E. coli), remain an important issue for clinicians. The aim of the study was to demonstrate clear differences in the pathogenic properties of urine-derived E. coli compared to other extraintestinal E. coli clinical isolates (derived from: blood, lower respiratory tracts, sputum, reproductive tract, body fluids, perianal pus, other pus, wound, postoperative wound and other sources).MethodsThe collection of 784 E. coli isolates was collected from various materials of hospitalized patients. They were analyzed in terms of virulence-associated genes (papC, sfaD/sfaE, cnf1, usp., fimG/H, hlyA), belonging to phylogenetic groups and the presence of CRISPR-Cas regions using PCR. In addition, the epidemiological data and the antibiotic resistance profiles provided by the hospital’s microbiology department were included for statistical analyses.ResultsUrine-derived E. coli showed significantly greater virulence potential compared to other isolates, but they were generally unremarkable in terms of drug resistance. The isolates most often belonged to phylogenetic group B2. Drug resistance was negatively correlated with CRISPR 2 presence and high average virulence score, but positively correlated with CRISPR 4 presence. To the best of our knowledge, we are the first to report significant differences in sputum-derived isolates—they revealed the lowest virulence potential and, at the same time, the highest drug resistance.DiscussionIn conclusion, we demonstrated significant differences of urinary-derived E. coli compared to other clinical E. coli isolates. We would like to suggest excluding penicillins from use in E. coli infection at this time and monitoring strains with a high pathogenicity potential.

DEPENDENCE OF THE DEVELOPMENT OF HISTOLOGICAL CHANGES IN THE TISSUES OF THE FALLOPIAN TUBES IN ADOLESCENT GIRLS AND YOUNG WOMEN WITH INFLAMMATORY GENITAL DISEASE ON THE TAXONOMIC AFFILIATION OF PATHOGENS

The aim. To conduct a comparative analysis of the fallopian tubes' clinical, microbiological and histological characteristics in adolescent girls and young women with inflammatory genital disease.
 Materials and methods. The etiological diagnosis of inflammatory disease was established with the help of complex microbiological and cytological studies of biomaterial from the vagina of teenage girls and the cervical canal of young women before hospitalization and histological examination fragments of fallopian tube – after surgery. The microbiological examination included the cultural detection of bacteria of various taxonomic groups, fungi, mycoplasmas, and ureaplasmas from the biomaterial. A set of methods described in the article was used to detect chlamydia [13]. The degree of bacterial infection of the fallopian tube fragments was assessed by determining the microbial count. Histological examination of biopsy specimens of fallopian tube tissues removed during surgery was performed by the conventional method [9].
 Results. In the examination of 29 adolescent girls and young women hospitalized for surgical treatment, a comparative analysis was conducted between the clinical manifestations of inflammatory genital disease, identifiable factors, and histological signs of damaged fallopian tubes.When studying the spectrum of factors in the inflammatory focus (fallopian tube biopsies) in adolescent girls (n=12), enterobacteria (33.3%), staphylococci (33.3%), streptococci (8.35%), and Pseudomonas aeruginosa (8.35%) were detected; in 16.7% of adolescent girls, the cultures were sterile. In young women (n=17), microbiological examination of fallopian tube tissues revealed chlamydia (29.4%), mycoplasma (11.6%), ureaplasma (5.8%), gonococci (5.8%), enterobacteria (5.8%), fungi (5.8%); in 6 (35.8%) of the examined women, no bacterial growth was detected. Among young women who had been operated on for tubo-ovarian inflammatory diseases and ectopic pregnancy, chlamydia were most often (29.4%) found in the tissues of the fallopian tubes.
 Conclusions. The studies have shown that in the development of acute purulent salpingitis in young women, sclerotic changes and signs characteristic of the productive process prevailed in the tissues of the fallopian tubes against the background of genital inflammation, and in adolescent girls, an exudative process was observed against the background of genital inflammation. The peculiarities of the course of genital inflammation depend on the biological properties of pathogens of different taxonomic affiliations.

Analysis of changes in the genome of Vibrio cholerae O1 El Tor genovariants during the current period of the cholera pandemic

Introduction. The genome variability of genetic variants of El Tor cholera agent has led to the emergence of strains carrying mutations in various genes associated with epidemically important pathogen properties. This situation requires an assessment of the trends in these changes in order to predict the pathogenic potential of previously unknown variants and promptly develop new tools for their diagnostics and prevention.
 The purpose of this work was to analyze the dynamic changes in pathogenicity and drug resistance genes of V. cholerae El Tor genetic variants from endemic countries and Russia.
 Materials and methods. We analyzed complete genome nucleotide sequences of 104 V. cholerae El Tor strains from the NCBI Gen Bank and European Nucleotide Archive databases, as well as those obtained by us. The nucleotide sequences were analyzed using the UGEN v. 45.1 software. The dendrogram was constructed using maximum parsimony algorithm in BioNumerics v.7.6 software package based on the multiple alignment generated using the Snippy 4.6.0 program.
 Results. Genomic sequences of 103 strain genovariants isolated on the territory of nine endemic countries of Asia and Africa, as well as in Russia in 1991-2022, have been compared. It is shown that the process of genovariant genome changing was multistage and occurred due to the continuous accumulation of point mutations in key (ctxB and tcpA) and additional (rtxA) genes of pathogenicity and core genes of antibiotic resistance (gyrA, parC and carR), as well as a deletion in SXT element. The most important was the change in the ctxB gene and the emergence of new genovariants with the ctxB7 allele, which replaced the previously prevalent strains. Analysis of altered genome regions of 83 strains from endemic regions has revealed eight genotypes, while the strains (21 isolates) imported to Russia belonged to only five of them including highly virulent strains with the ctxB7 allele and lost PolR biovar-specific feature due to carR gene mutation. The established close phylogenetic relatedness of genovariants from Russia with strains from endemic Asian countries confirms their importation from this region.
 Conclusion. The sequential occurrence and accumulation of mutations in the pathogenicity and drug resistance genes in the genome of genovariants in endemic regions have been shown, which leads to a change in their epidemically important features. The importation of new highly virulent genovariants into Russia has been established, which indicates the need for an ongoing assessment of changes in the genome of this pathogen for the timely development of adequate means of gene diagnostics and prevention.

Pathogenic role of anti-cN1A autoantibodies in sporadic inclusion body myositis

BackgroundSporadic inclusion body myositis (sIBM) is an intractable muscle disease that frequently affects elderly people. Autoantibodies recognising cytosolic 5’-nucleotidase 1A (cN1A) were found in the sera of patients with sIBM....

Virulence And Drug Resistance Pattern Of Escherichia Coli Isolates From Various Clinical Sample

Introduction: E. coli is one of the most common pathogens, and its infection has resulted in a global burden due to its increased medication resistance and virulence factors. The goal of this study was to examine the drug resistance pattern and pathogenicity properties of Escherichia coli isolates. Methods: Over the course of six months (March 2019-August 2019), a laboratory-based cross-sectional study was done among patients visiting Manmohan Memorial Teaching Hospital in Kathmandu, Nepal. Standard microbiological procedures were used to identify bacterial isolates from clinical specimens. The modified Kirby Bauer disk diffusion method was used to determine antibiotic susceptibilities. The combined disk test method was used to confirm the ESBL and MBL. To determine their virulence, serum bactericidal activity and biofilm productions were determined. Results: 59.60 percent (n=81) of the 136 Escherichia coli isolates were multidrug resistant, 25.70 percent (n=35) were ESBL producers, and 11.80 percent (n=16) were MBL producers. Serum resistance was discovered in 22.8 percent (n=31) of the total isolates, while biofilm formation was found in 19.11 percent (n=26). Amoxycillin had the highest level of resistance (87.5%), whereas Chloramphenicol (93.4%) and Imipenem (80.9%) were the most susceptible antibiotics. Polymyxin B and Colistin sulphate were absolutely sensitive. In our investigation, 61.5 percent of biofilm producers were MDR, with non-beta lactamase types being the most common. MBL producers were discovered to be more serum resistant. Amikacin and Imipenem were found to be more sensitive to biofilm makers. Conclusions: The expression of Escherichia coli virulence factors varied depending on the kind of infection. Escherichia coli has a high rate of multidrug resistance. To minimize the emergence and spread of antibiotic resistance in bacteria, proper identification of drug-resistant bacteria, careful use of antibiotics, and effective antibiotic policy are required.

In vitro characterization of rare anti-αIIbβ3 isoantibodies produced by patients with Glanzmann thrombasthenia that severely block fibrinogen binding and generate procoagulant platelets via complement activation

BackgroundGlanzmann thrombasthenia (GT) is a rare bleeding disorder caused by inherited defects of the platelet αIIbβ3 integrin. Platelet transfusions can be followed by an immune response that can block integrin function by interfering with fibrinogen binding. ObjectivesIn this study, we aimed to determine the prevalence of such isoantibodies and better characterize their pathogenic properties. MethodsTwelve patients with GT were evaluated for anti-αIIbβ3 isoantibodies. Sera from patients with GT with or without anti-αIIbβ3 isoantibodies were then used to study their in vitro effect on platelets from healthy donors. We used several approaches (IgG purification, immunofluorescence staining, and inhibition of signaling pathways) to characterize the pathogenic properties of the anti-αIIbβ3 isoantibodies. ResultsOnly 2 samples were able to severely block integrin function. We observed that these 2 sera caused a reduction in platelet size similar to that observed when platelets become procoagulant. Mixing healthy donor platelets with patients’ sera or purified IgGs led to microvesiculation, phosphatidylserine exposure, and induction of calcium influx. This was associated with an increase in procoagulant platelets. Pore formation and calcium entry were associated with complement activation, leading to the constitution of a membrane attack complex (MAC) with enhanced complement protein C5b-9 formation. This process was inhibited by the complement 5 inhibitor eculizumab and reduced by polyvalent human immunoglobulins. ConclusionOur data suggest that complement activation induced by rare blocking anti-αIIbβ3 isoantibodies may lead to the formation of a MAC with subsequent pore formation, resulting in calcium influx and procoagulant platelet phenotype.

Susceptibility of Vibrio spp. from Gill of Barramundi (Lates calcarifer) Towards Antibiotics

Vibrio spp. bacteria are aquatic bacteria that can be found in brackish water and estuaries, and they have opportunistic pathogenic properties. These bacteria are usually dominant in brackish and estuarine areas such as river mouths, rivers, ponds, and seas with salinities between 20-40 ppt and a temperature of 37°C. The aim of this research is to determine the susceptibility and sensitivity of Vibrio spp. bacteria to various types of antibiotics. The Vibrio spp. bacteria isolated in this study were obtained from barramundi fish (Lates calcarifer). If they are still sensitive, the growth of Vibrio spp. bacteria can be inhibited by antibiotic administration. The effectiveness of antibiotics against Vibrio spp. bacteria in barramundi fish was tested using eight types of antibiotics, namely Co-Amoxiclav, Gentamicin, Doxycycline, Tetracycline, Azithromycin, Chloramphenicol, Ciprofloxacin, and Ampicillin. Bacteria that are sensitive to specific types of antibiotics have larger inhibition zones. The measurement of inhibition zones was carried out using a caliper by measuring the vertical and horizontal diameters and then dividing by 2 to obtain the average. This average was compared to a standard interpretative zone diameter chart to determine antibiotic sensitivity and resistance status using the Disk Diffusion method. Tetracycline and Ampicillin antibiotics can inhibit or are resistant to Vibrio spp. bacteria with a percentage of 0.08%. Gentamicin has greater sensitivity compared to the other tested antibiotics. In this study, the Vibrio spp. obtained are still sensitive to certain types of antibiotics and resistant to Ampicillin.

Improvement of quantitative microbiological risk assessment (QMRA) methodology through integration with gaenetic data.

Quantitative microbiological risk assessment (QMRA) methodology aims to estimate and describe the transmission of pathogenic microorganisms from animals and food to humans. In microbiological literature, the availability of whole genome sequencing (WGS) data is rapidly increasing, and incorporating this data into QMRA has the potential to enhance the reliability of risk estimates. This study provides insight into which are the key pathogen properties for incorporating WGS data to enhance risk estimation, through examination of example risk assessments for important foodborne pathogens: Listeria monocytogenes (Lm), Salmonella, Campylobacter and Shiga toxin-producing Escherichia coli. By investigating the relationship between phenotypic pathogen properties and genetic traits, a better understanding was gained regarding their impact on risk assessment. Virulence of Lm was identified as a promising property for associating different symptoms observed in humans with specific genotypes. Data from a genome-wide association study were used to correlate lineages, serotypes, sequence types, clonal complexes and the presence or absence of virulence genes of each strain with patient's symptoms. We also investigated the effect of incorporating WGS data into a QMRA model including relevant genomic traits of Lm, focusing on the dose-response phase of the risk assessment model, as described with the case/exposure ratio. The results highlighted that WGS studies which include phenotypic information must be encouraged, so as to enhance the accuracy of QMRA models. This study also underscores the importance of executing more risk assessments that consider the ongoing advancements in OMICS technologies, thus allowing for a closer investigation of different bacterial subtypes relevant to human health.

Analysis of Phytoconstituents and Antimicrobial Properties of Bacopa monnieri (L.) Against Clinical Pathogen

There are numerous therapeutic uses for medicinal plants in treating and managing numerous diseases. Traditional medicinal plantswere mostly needed in the current scenario. The world's warmer and wetlands regions are home to the medicinal herb Bacopa monnieri (L.).It has been utilized for ages in Ayurvedic systems. The Bacopa monnieri was one of the traditional medicinal plants. These are commonlycalled "Brahmi," and the Tamil vernacular name is "Neerbrahmmi." It is easy to cultivate and grow in all seasons. These peculiar activeingredients, also known as memory enhancement and phytoconstituents were enriched in this medicinal plant. The present study focused onanalyzing phytoconstituents and the antimicrobial activity of Bacopa monnieri leaves. The efficacy of phytoconstituents on the antimicrobialactivities concerning minimum inhibitory concentrations was performed with different polar and non-polar solvents of the respective plant.The phytoconstituents such as alkaloids, amino acids, coumarins, flavonoids, glycosides, phenols, phlobatannins, quinones, reducing sugars,saponins, steroids, tannins, and terpenoids were recorded, respectively. Antibacterial activity performed with following human clinicalbacteria like Clostridium butyricum, Escherichia coli, Staphylococcus aureus, and Streptococcus pneumoniae, and the antifungal activity against humanclinical such as Aspergillus flavus, A.niger, Aspergillus sp., and Penicillium sp. were determined. Among the two solvent extractions, the aqueousextract showed a more significant result than the benzene extract. According to the MIC, the antimicrobial properties of B.monnieriwithdifferent extracts were analyzed. The very minimum concentration has shown better inhibitions against microbes. The present study exploredthe antimicrobial properties of human clinical pathogens. So, the B.monnieriaqueous extract of leaves was suggested for the treatment ofmicrobial infections.

Acute sore throat in frequently ill children: potential of topical therapy

Sore throat is the most common reason for visiting primary care doctors, pediatricians, and ENT doctors. Acute sore throat, as a rule, is not an independent disease and most often accompanies tonsillopharyngitis caused by respiratory viral infections. In childhood, the share of acute respiratory viral infections among other infectious diseases can reach up to 90%, and the proportion of frequently ill children ranges from 30 to 50%. A feature of frequently ill children is a high incidence of illness, regardless of seasonality, and a tendency to a protracted course of the inflammatory process. Uncontrolled systemic antibiotic therapy for acute sore throat in frequently ill children leads to the development of dysbacteriosis and a decrease in mucosal immunity. The use of the topical antibacterial drug Faringazon for sore throat in children reduces inflammation in both viral and bacterial infections and reduces the need for systemic antibiotic therapy. The active substance of Ambazon has a bacteriostatic effect when is kept in the mouth until it resorbs and is effective against Streptococcus haemolyticus, Streptococcus pneumoniae, Streptococcus viridans, and also has antifungal effects against Candida albicans yeast fungus, which is a saprophyte, but exhibits pathogenic properties in decreased body’s immune defence and dysbiosis. The use of topical antimicrobial therapy helps reduce inflammation and speed up the recovery of patients without prescription of systemic antibiotics, and also ensures the preservation of microbiome, reducing the probability of emergence of antibiotic resistant strains to the minimum.

Metabolism and gene sequence variation in Turicella otitidis implies its adaptability and pathogenicity in extra-otic infection: a systematic review

Turicella otitidis belongs to the Corynebacteriaceae family and is a normal inhabitant of the ear and exists in a commensal relationship with its host. In children, T. otitidis is frequently associated with otitis media. The emergence of Turicella otitidis as a pathogen is concerning, particularly due to the limited availability of data on its pathogenic properties. The objective of this study is to conduct a systematic review of T. otitidis infections occurring in both the ear and other anatomical sites, and to summarize the differences in metabolism and genome sequences between isolates obtained from the ear and blood.

Isolation and Molecular Characterization of Atypical Porcine Pestivirus Emerging in China.

Atypical porcine pestivirus (APPV) is a recently discovered and very divergent species of the genus Pestivirus within the family Flaviviridae, which causes congenital tremor (CT) in newborn piglets. In this study, an APPV epidemiological investigation was conducted by studying 975 swine samples (562 tissue and 413 serum samples) collected from different parts of China from 2017 to 2021. The results revealed that the overall positive rate of the APPV genome was 7.08% (69/975), among which 50.7% (35/69) of the samples tested positive for one or more other common swine viruses, especially porcine circovirus type 2 (PCV2) with a coinfection rate of 36.2% (25/69). Subsequently, a novel APPV strain, named China/HLJ491/2017, was isolated in porcine kidney (PK)-15 cells for the first time from a weaned piglet that was infected with both APPV and PCV2. The new APPV isolate was confirmed by RT-PCR, sequencing, immunofluorescence assay, and transmission electron microscopy. After clearing PCV2, a pure APPV strain was obtained and further stably propagated in PK-15 cells for more than 30 passages. Full genome sequencing and phylogenetic analysis showed that the China/HLJ491/2017 strain was classified as genotype 2, sharing 80.8 to 97.6% of its nucleotide identity with previously published APPV strains. In conclusion, this study enhanced our knowledge of this new pestivirus and the successful isolation of the APPV strain provides critical material for the investigation of the biological and pathogenic properties of this emerging virus, as well as the development of vaccines and diagnostic reagents.