Bacterial Colonies Research Articles

Antibacterial potential of queen pineapple (Ananas comosus (L.) Merr Var. Queen) peel extract on the growth of Lactobacillus acidophilus bacteria

Based on the Global Burden of Disease Study in 2017, the prevalence of caries in each country reached 20% to more than 50%. Caries is formed due to the role of several factors including host, agent (microorganisms), substrate, and time. Bacteria involved in the origin of caries formation such as Lactobacillus group bacteria found in the oral cavity which can cause dental caries, one of which is Lactobacillus acidophilus. The use of natural cleansers is highly recommended to remove residual bacteria as an effort to prevent caries. Queen Pineapple (Ananas comosus (L.) Merr Var. Queen) is a fruit that contains very complex compounds that can act as anticarcinogenic and antibacterial. This study aims to determine the Minimum Bactericidal Concentration (MBC) and Minimum Inhibitory Concentration (MIC) against the growth of Lactobacillus acidophilus bacteria. This type of research was a laboratory experimental type with posttest only control group design. This study used the dilution method of the number of samples, namely concentrations of 0.781%, 1.56%, 3.125%, 6.25%, 12.5%, 25%, 50%, 100%, positive controls and negative controls. This study was conducted 3 times repetition. Manual calculation of the number of bacterial colonies that grow on nutrient agar media and expressed in colony forming units (CFU) which will determine the MBC and MIC. The Shapiro-Wilk test showed a p value> 0.05 at all concentrations and normally distributed data, but when tested for homogeneity the data was not homogeneous so that the non-parametric statistical test continued using the Kruskal Wallis test showing a value of p < 0.05. Conclusion: Colony count results showed that the concentration of 3.12% can inhibit the visible growth of Lactobacillus acidophilus bacteria which is stated as the Minimum Inhibitory Concentration (MIC) and can prevent growth after subculture to antibiotic-free medium at a concentration of 6.25% which is stated as the Minimum Bactericidal Concentration (MBC).

Antimicrobial and Superhydrophobic CuONPs/TiO2 Hybrid Coating on Polypropylene Substrates against Biofilm Formation.

Biofilm formation in common public places and hospitals is of great concern. Active antimicrobial coatings can prevent the formation of bacterial biofilms and the spreading of primary and secondary infections caused by contagious bacteria and viruses. In the present work, we report a simple spray coating process using copper oxide (CuO) nanoparticles (NPs) dispersed in a titanium dioxide (TiO2) sol, where CuONPs act as the active antimicrobial agent and TiO2 as the inorganic binder. Homogeneous CuONPs/TiO2 coating was obtained on polypropylene substrates by spraying the CuO/TiO2 sol using a commercial air gun, followed by drying at 80 °C. The amount of CuONPs loading in the coating was adjusted by controlling the number of coated layers. CuONPs and CuONPs/TiO2 coatings were characterized by XRD, BET, X-ray fluorescence spectroscopy, AFM, and field emission scanning electron microscopy techniques. All of the coated films showed dual activity, i.e., antimicrobial and superhydrophobicity. A high bactericidal effect against both Escherichia coli and Staphylococcus aureus was observed for the coated substrates. Coatings with higher CuONPs showed greater antibacterial activity, reaching R value >6, and no bacterial colonies were detected after 24 h of incubation. An increasing trend of water contact angle was observed with the increasing amount of CuONP loading.

Sanitary Surveillance Program for pools in Matosinhos, Portugal

Abstract The use of pools for sports, recreational, and therapeutic activities has increased over time. It is important to ensure and control the quality of the water and surrounding areas, as well as the hygienic-sanitary conditions of these spaces. The ‘2018 Pool Sanitary Surveillance Program’ of the Portuguese Northern Regional Health Administration proposes the surveillance of water quality, teaching accessories, and surfaces. The aim of this investigation is to conduct microbiological analysis of the teaching accessories and surfaces in public pools in the municipality of Matosinhos and assess if this program has improved the results for water quality, teaching accessories, and surfaces from 2018 to 2023. The environmental health team of our Public Health Unit performed swabs of the teaching accessories and surfaces of all seven public pools in Matosinhos for microbiological analysis. The swabs were performed in 2018 (21), 2019 (48) and 2023 (42). During each visit, three random points were selected for analysis. In 2019, 31 rugs (64,6%) were analysed, but in 2023 only 10 (23,8%) were rugs. It was found that rugs had the highest contamination by P. aeruginosa (94,4%), fungi (60,8%), and the only sample with coagulase-positive Staphylococci. There was a decrease in samples from twelve to six with P. aeruginosa and an increase from 22 (46.8%) to 29 (69.0%) with fungi from 2019 to 2023. Bacterial colonies grew in 20 samples (95.2%) in 2018, 44 (91,6%) in 2019, and 42 (100%) in 2023. All water samples collected for the evaluation of microbiological parameters outlined obtained compliant results. Fungal and P. aeruginosa detection indicate a potential risk to the health of pool users. A quality report with corrective measures was produce for each pool in each visit. Surveillance of pool water, teaching materials and surrounding surfaces, is crucial to ensure water quality and safety. By doing so, we may lower the risk of disease transmission and protect the population’s health. Key messages • To ensure the safety of pool users is a public health challenge. It would be relevant to have legislation that addresses this issue. • To survey pools and its surroundings and accessories must be a continuous task, allied with literacy to management and users.

Growth performances of Clarias gariepinus juveniles fed with Jatropha curcas seed meal

Jatropha curcas is an oil producing seed with high nutritional qualities for consumption. However, due to inherent anti-nutritional factors, appropriate processing is necessary to improve its nutrients utilization. This study was aimed at processing J. curcas using solvent-extraction method and evaluating its inclusion effects in the diet for Clarias gariepinus on its growth status. J. curcas meal was extracted using 80 % methanol to remove phorbol esters and other anti-nutrients. Thereafter, five iso-nitrogenous diets (40 % crude protein) were formulated containing J. curcas meal replacements of soybeans meal at 0 % (TRT0), 25 % (TRT25), 50 % (TRT50), 75 % (TRT75) and 100 % (TRT100) and fed to C. gariepinus for 70 days. Results showed that TRT25 fish had the highest mean weight gain and specific growth. The serum alkaline phosphate, alanine aminotransferase, and aspartate aminotransferase levels began to rise significantly (p ≤ 0.05) at 50 % replacement. Likewise, the assessment of gut ecology and morphology indicated that TRT25 had significantly (p ≤ 0.05) the highest gut bacteria colony forming unit (2.60 ×104±0.02cfu/g) and most favorable area of absorption (0.16±0.01 cm2). The histopathological observation of the fish intestine, liver and gills indicated no visible deformity in TRT0 and TRT25 fish. However, various degrees of degenerations were observed in the fish fed with 50 % and higher inclusion of J. curcas. This study showed that methanol-extracted J. curcas meal can be effectively utilized for C. gariepinus at 25 % of replacement.

Prevalence of extended-spectrum β-lactamase-producing Enterobacterales and carbapenemase-resistant Enterobacterales in British military cohorts

IntroductionTravel to resource-limited settings is a known risk for acquisition of extended-spectrum β-lactamase-producing Enterobacterales (ESBL-PE) and carbapenem-resistant Enterobacterales (CRE), which are both associated with increased morbidity and mortality. We investigated...

Risk factors for bacterial stent colonization in patients with a double J ureteral stent: a prospective study.

The increasing use of double J ureteral stents (DJS) has increased the risk of early intolerance and long-term complications. Studies have reported stent colonization rates ranging from 19 to 90% with various bacterial profiles in the colonization of stents. To identify the risk factors associated with bacterial colonization of DJS and report the common micro-organisms isolated and drug susceptibility pattern. This study is a prospective study of patients who underwent DJS. A total of 48 patients from our institution were studied between March 2022 and August 2023. After the removal of DJS with a sterile technique, the tips of both ends (renal end and bladder end) of the stent were cut and processed in the microbiology lab. Bacterial colonies were detected in 56.25% (27 out of 48) of the stents. Among the pathogens identified, Enterococcus species, Pseudomonas aeruginosa and E. coli were the most frequently isolated. The colonization rate increased with the duration of stent placement and albuminuria. The study indicated that prolonged indwelling time and albuminuria are a risk factor for bacterial colonization on the stent therefore, it is advisable to use double J ureteral stent only when absolutely necessary and to remove them promptly.

Changes functional prediction of ear canal flora in chronic bacterial otitis externa.

To investigate ear canal microflora's structure, composition and function in patients with chronic bacterial otitis externa. A case-control study design method was used to collect the ear canal secretions from 14 patients with chronic bacterial external otitis (CB group) and 14 healthy controls (H group) treated in the Department of Otolaryngology and Head and Neck Surgery in the First Affiliated Hospital of Hainan Medical University. 16S rRNA high-throughput sequencing technology was used to sequence the ear canal microflora's V3 ~ V4 region gene amplification products in the participating population. The α diversity of ear canal microflora in 2 groups was analyzed. Based on the weighted Unifrac distance, principal coordinate analysis was performed to compare the β diversity of ear tract microflora between the two groups. The differences in ear microflora at phylum and genus levels were analyzed. PICRUSt2 function prediction and BugBase phenotype prediction were also performed. α diversity analysis showed that the diversity and richness of auricular microflora in the CB group were significantly lower than those in the H group. β diversity analysis showed that there were some differences between the two groups. At the phylum level, the relative abundance of Bdellovibrionota, Campylobacterota, and WPS-2 in the microbiota of patients in the CB group was significantly lower than that in the H group, and the differences were statistically significant. At the genus level, the relative abundance of Pseudomonas, Acinetobacter, Pelomonas, Sphingomonas, Bradyrhizobium, Brevundimonas, Enhydrobacter, Actinomyces, Paracoccus and Chryseobacterium in the ear canal of Group H is significantly higher than that of Group CB. Functional prediction of PICRUSt2 suggests that amino acid biosynthesis and bacterial microbiota may be related. In BugBase phenotypic prediction, the contribution of aerobic phenotype in group CB was significantly lower than that in group H. The diversity and abundance of the ear canal flora of patients with chronic bacterial otitis externa were significantly lower than those of the healthy population, and their bacterial colony structure was significantly altered. Dysbiosis of the ear canal flora may be an important cause of chronic bacterial otitis externa.

Extended-spectrum beta-laktamase (ESBL) enzyme producing bacteria isolated from rectal swabs of around animals in dairy farms

This study aims to identify bacterial contamination of Klebsiella pneumoniae and Escherichia coli producing Extended Spectrum Beta Lactamase (ESBL) isolated from rectal swabs of local animals on a dairy farm in Deyeng Village, Kediri, East Java. Interviews and observations were conducted with farmers to obtain the required risk factor data (cleanliness of drinking and eating places, drinking water sources, and administration of antibiotics to livestock). The number of samples tested in this study was 34 samples, including 12 chicken samples, 8 goat samples, 5 duck samples, 4 rabbit samples, 3 cat samples and 2 goose samples. Samples were isolated on MCA media + cefotaxime 1 mg/l and isolated again on MCA media without the addition of antibiotics to multiply pure bacterial colonies. The tests carried out to determine the presence of ESBL-producing bacteria are biochemical tests, namely the IMViC test (Indole, Methyl red, Voges-Proskauer, Citrate Utilization), TSIA (Triple Sugar Iron Agar) test, gram staining, and the Double Disk Standard Method test using β-lactam disc antibiotics, namely cefotaxime 30μg, ceftazidime 30μg, and amoxycilline-clavulanate acid 30μg. The results of this research were that 6 samples or 17.6% of ESBL-producing bacteria were identified from poultry groups (chickens, ducks and geese) from dairy farms in Deyeng Village, Kediri Regency, East Java.

Optimisation of Lactobacillus fermentation conditions and its application in the fermentation of salt-free sauerkraut.

To identify what are the dominant lactic acid bacteria (LAB) involved in the fermentation of salt-free sauerkraut, and optimize its industrial culture conditions, we isolated and identified a strain of LAB, which is referred to as Lactobacillus sp. DF_001, with the preservation number CCTCC NO: M20232593, from five different regions in Guizhou Province. Industrial culture conditions were optimized using Plackett-Burman and Central Composite design experiments, and the potential role of this LAB in salt-free sauerkraut fermentation was validated. Bioproduction was optimal with a culture time of 66 h, starch/water ratio of 1.7% and inoculum of 0.02%, which gave approximately three-fold higher yield than the basal culture medium DeMan-Rogosa-Sharpe medium (MRS). The LAB was used in small-scale industrial experiments. The Dafang LAB significantly enhanced the sensory score of the salt-free sauerkraut products by about 32% compared to the control group. The total acid content increased by about 32% and the sugar and nitrite contents were reduced by 67.27 and 69.58%, respectively. The total number of bacterial colonies decreased by 37.5%. All other indicators complied with the national standard, providing overall the basis to improve salt-free sauerkraut fermentation.

Investigation of Microbiological Effects of Atmospheric Pressure Cold Plasma on Hand Disinfection

<b>Aim:</b> Atmospheric pressure cold plasma is the fourth state of matter obtained at low temperature with atmospheric pressure, which has antimicrobial, anti-inflammatory, sterilization, disinfection and surface modification enhancing properties. The aim of this study is to investigate the effectiveness of plasma activated medium (PAM) obtained from atmospheric pressure cold plasma on hand disinfection.<br /> <b>Methods and Materials</b>: The study was carried out on 15 individuals aged between 18 and 65 with healthy hand structures (no wounds, no pathology). Of the 15 individuals, 5 were selected as cleaning staff, 5 as office stuff, and 5 as academics. Samples were first taken from individuals using swap for bacterial identification. Afterwards, they were asked to wash their hands for 5 minutes in 250 ml PAM. At the end of the period, samples were taken from the individuals in the same way for bacterial identification using swap. The effectiveness of PAM in terms of hand disinfection was determined by comparing these two samples.<br /> <b>Results:</b> As a result of our study, it was found that bacterial colonies decreased in 3 of the samples taken from the hands of 5 cleaning personnel, remained stable in 2, a decrease in bacterial colonies in 4 of 5 office stuff, remained constant in 1, a decrease in bacterial colonies in 3 of 5 academicians, and remained stable in 2 of them. <i>Staphylococcus aureus, Staphylococcus epidermidis, Bacillus megaterium, Staphylococcus capitis, Streptococcus mitis, Staphylococcus warneri</i> bacteria were identified on the hands of individuals.<br /> <b>Conclusion:</b> As a result of our study, it was found that PAM, which has no side effects in the literature, can be an effective tool for hand disinfection.

Identification of pathogenic bacteria from eggshell of leatherback sea turtle (Dermochelys coriacea) in Lampuuk Beach, Aceh Besar using 16S rRNA gene

Currently, the leatherback turtle population in Indonesia tends to decline. One of the factors that cause turtles' existence is the turtle eggs that fail to hatch because bacteria contaminate them, 80% of the reasons turtle eggs fail to hatch are due to infection by microorganisms found on the eggshell. Turtle eggs have a soft structure and there are pores that function for gas exchange and water absorption. Microorganisms in sand can infect turtle eggs through the pores and cause hatching failure. This study aims to isolate and identify pathogenic bacteria found in leatherback turtle eggshell (Dermochelys coriacea) from Lampuuk Beach, Aceh Besar, based on the 16S rRNA gene analysis. Eight eggshell samples from leatherback turtle eggs that failed and hatched were cultured on Nutrient Agar (NA) medium. Then, the samples were inoculated on a blood agar medium for haemolysis test. Molecular identification of the 16S rRNA gene was also carried out to determine bacterial species. A total of five bacterial colonies from leatherback turtle eggshells were successfully isolated consisting of two Gram-negative bacteria (Penyu Belimbing Aceh (PBA) = PBA-1 and PBA-2 and three Gram-positive bacteria (PBA-3, PBA-4, and PBA-5). Based on the haemolysis test, the five bacterial isolates were unable to haemolyze blood. Bacterial DNA of PBA-1 and PBA-2 were successfully isolated and amplified using polymerase chain reaction (PCR) with a DNA target of ~1500 bp. Analysis using BLASTN and phylogenetic tree construction showed that PBA-1 isolate had 98.64% similarity with Acinetobacter baumannii, while PBA-2 isolate had 97.82% similarity with Enterobacter kobei. Both bacteria are members of the Enterobacteriaceae family. It can be concluded that, there were two pathogenic bacteria can potentially be opportunistic pathogens found in leatherback turtle eggshells that failed or succeeded in hatching, namely A. baumannii and E. Kobei

First Report of Fire Blight Caused by Erwinia amylovora on Pear in Saudi Arabia.

In the spring of 2020 and 2021, pear trees (Pyrus communis cv. Williams) in orchards (27°46'36.0"N 42°29'44.7"E, 30°00'00.2"N 40°15'11.8"E, and 28°44'52.9"N 36°18'47.8" E) in Hail, Al Jouf, and Tabuk regions exhibited fire blight symptoms. After removing bark, the affected trees showed shoot blight, brown-blighted shoot tips and blossom blight, dead flowers on the stems, and reddish-colored cankers. The disease incidence varied from 10% to 25%. Pathogen was isolated from 21 symptomatic samples including fruits, flowers, and shoots. Bacteria were isolated from washed tissues on King's B (KB) and semi-selective CCT media (Ishimaru and Klos, 1984). After 48 hours, colonies resembling Erwinia amylovora on KB media were 1.5-2 mm in diameter, white, circular, slightly convex, with a smooth surface, and exhibited no fluorescence under ultraviolet light. Colonies on CCT after 72 h were 3-4 mm in diameter, mucoid with shiny surfaces, semitransparent, speckled with craters, and slightly violet. All isolates were purified by subculturing on KB. All isolates were Gram-negative and rod-shaped, fermentative of glucose, positive for catalase and negative for oxidase, and potato rot. They induced a hypersensitive reaction when infiltrated in tobacco leaves (cv. Xanthi). Based on morphology and biochemical tests (EPPO, 2004), the strains were identified as Erwinia sp. Twenty-six strains from Saudi Arabia (SA) and the reference strain (NCPPB 683T) hydrolyzed gelatin and formed white, highly mucous colonies on the levan medium. These strains could not reduce nitrate to nitrite and tested negative for urease and indole production. All the isolates and the reference strain were confirmed to be E. amylovora based on a PCR 0.9-kb DNA fragment amplification with a species-specific primer set, A/B targets pEA29 (Bereswill et al. 1992). 16S-rDNA fragments from Saudi isolates were amplified with 27F and 1492R primers (Lane, 1991). Purified amplicons from PCR were sequenced (OR717505 and OR743536-OR743560), and a BLAST search of the GenBank database revealed 100% (927/927) homology with E. amylovora strain CP066796.1. The housekeeping gene rpoB was PCR amplified with primers CM7-F and CM31b-R (Rezzonico et al. 2012), and the products were sequenced (PP465516-PP465541). BLAST analysis showed 100% (944/944 nt) and 96.19% (908/944 nt) identities with the sequences of E. amylovora ATCC 15580 CP066796.1 and E. pyrifoliae CP201486 CP103445.1, respectively. To fulfill Koch's postulates, SA strains were inoculated on five healthy 3-month-old clones of apple (Malus domestica cv. Gala) per strain with a 10-μl bacterial suspension containing 107 colony-forming units per milliliter by injecting directly in the veins of the upper second leaf plus 5 healthy plants injected with sterile distilled water as control. Plants were incubated at 28°C for six days under a 12-hour light regime. Observed symptoms were similar to the ones observed in the field. The experiment was replicated twice. Bacterial colonies on CCT media were re-isolated from the inoculated apple rootstocks and confirmed by the A/B primer set. To our knowledge, this is the first peer-reviewed report of E. amylovora in SA since the fire blight-like symptoms were observed in SA in 2013 (Alhudaib, 2013). Further research will identify new host plants for the fire blight pathogen within SA which is important due to the importation of pome fruit seedlings (quince, apple, and pear) from neighboring Jordan where E. aylovora was reported (Tehabsim et al. 1992).

GARLING WITH A SOLUTION OF ACACIA CARPA HONEY SOLUTION OF 10% CONCENTRATION ON THE DEGREE OF SALIVA ACIDITY AND THE TOTAL PLATE COUNT (TPC) OF THE NORMAL FLORA OF THE ORAL CAVITY IN CHILDREN

Saliva functions as a buffer that can prevent a decrease in pH or an increase in mouth acidity. Alcohol-free mouthwash containing herbs using honey solution which is made from natural ingredients and is safe for children can be used as an appropriate preventive measure to maintain oral hygiene. The normal flora of the oral cavity consists of microorganisms including bacteria, fungi, mycoplasma, protozoa and possibly viruses. The aim of the research was to analyze the effect of gargling with a 10% concentration of Acacia Carpa (Acacia Crassicarpa) honey solution on the degree of saliva acidity and Total Plate Count (TPC) of normal oral flora and Gram bacteria in children aged 8-9 years. Method: True experimental research type, with a group pre-test post-test with control group design. The sampling technique was carried out by simple random sampling of 30 children. The degree of acidity of saliva is measured using litmus paper, bacterial colonies are incubated on Nutrient Agar media for 24 hours and counted. Test the normality of the data using the one sample Kolmogorov-Smirnov test. Data were analyzed using the Paired T-test if it was normally distributed and the Kruskal Wallis test if it was not normally distributed. Results: The 10% concentration honey gargle group resulted in the average degree of acidity before, namely 7.00, after 6.98, then the average Total Plate Count (TPC) result for normal oral flora, namely before, was 100.47 CFU/ml, whereas after, it was 69.67. CFU/ml. Paired T-Test test results for the 10% honey gargle group Sig. 0.003 (< 0.05), so there is a significant difference between the Total Plate Count (TPC) before and after gargling honey with a concentration of 10%. Conclusion: There is an effect of gargling honey with a concentration of 10% on Total Plate Count of normal oral flora

ESSAI DE TRAITEMENT BIOLOGIQUE DES HUILES LUBRIFIANTES USAGÉES RÉCUPÉRÉES DANS DES GARAGES DE KINSHASA À L’AIDE DES URINES HUMAINES ET KAOLIN EN RÉPUBLIQUE DÉMOCRATIQUE DU CONGO

In the various car garages of Kinshasa (in the Democratic Republic of Congo), the lack of consideration of environmental standards is the basis of the voluntary and/or accidental discharges of used oils directly into the environment without any prior treatment. These used hydrocarbons are pollutants that can cause major environmental problems due to their toxicity. The aim of this study is to treat used lubricating oils from car garages biologically in order to reduce their toxic potential. To this end, an aerobic biological treatment system was set up by mixing 4L of used oils with IL of urine, 2Kg of active Kaolin and 20L of water. The reduction in the toxicity of hydrocarbons was assessed through acute toxicity tests on the species Gambusia Affinis and microbiological analyses before and after biological treatment of these oils. The results obtained on the toxicity before treatment of these oils revealed that the LC50 was around ±3 ml/g of used oils to say that the pollutant is very toxic. After biological treatment, the LC50 rise to around ±66.7 ml/g for the treated oils, which represents a significant reduction in toxicity and ranks these treated oils in the order of less toxic effluents. The microbiological analyses of the used oils before their treatment did not show any bacteria; on the other hand, the analyses after treatment made it possible to highlight the presence of bacterial colonies whose identification revealed the following bacteria: Citrobacter, Enterobacter, Klebsiella and Pseudomonas, which are mostly lipolytic. This study thus allowed to treat used oils thanks to microorganisms and the intrinsic properties of urine and Kaolin.

Unique ecology of biofilms and flocs: Bacterial composition, assembly, interaction, and nitrogen metabolism within deteriorated bioreactor inoculated with mature partial nitrification-anammox sludge

This work unraveled discrepant ecological patterns between biofilms and flocs in a deteriorated bioreactor inoculated with mature partial nitrification-anammox (PN/A) sludge. Based on 16S rRNA analysis, a comprehensive evaluation of neutral and null models, along with niche width, delineated that the bacterial community assembly in biofilms and flocs was dominantly driven by the stochastic process, and dispersal limitation critically shaped the community assembly. Co-occurrence network analysis revealed that environmental stress caused decentralized and fragmented bacterial colonies, and anammox bacteria were mainly peripheral in biofilms network and less involved in interspecific interactions. Simultaneous PN/A and partial denitrification-anammox (PD/A) processes were identified, whereas PN and PD process primarily occurred in the biofilms and flocs, respectively, as evidenced by metagenomics. Collectively, these outcomes are expected to deepen the basic understanding of complex microbial community and nitrogen metabolism under environmental disturbance, thereby better characterizing and serving the artificial ecosystems.

Intra-abdominal nocardiosis and scedosporiosis in a dog: case report and literature review.

A 2-y-old, intact female, mixed-breed dog was presented to the veterinary hospital with abdominal distension, anemia, and lethargy following a chronic history of nonspecific gastrointestinal signs. CBC and serum biochemistry revealed moderate nonregenerative anemia with neutrophilia, hypoalbuminemia, hyperglobulinemia, hypoglycemia, decreased urea and creatinine, and hypercholesterolemia. Abdominal radiographs and ultrasound revealed a large heterogeneous mesenteric mass and ascites. Abdominocentesis confirmed septic peritonitis with filamentous bacteria. Fine-needle aspiration of the mass yielded pyogranulomatous inflammation and hyphae. An exploratory laparotomy revealed a large cranial abdominal mass with granulomas present throughout the abdominal cavity. Due to the poor prognosis and disseminated disease, the owner elected euthanasia. Postmortem and histologic examinations detected intralesional mycetomas and bacterial colonies within the mesenteric masses. 16S ribosomal RNA gene PCR and sequencing using formalin-fixed, paraffin-embedded sections identified Nocardia yamanashiensis, Nocardioides cavernae, and Nocardioides zeicaulis. Fungal culture, PCR, and sequencing confirmed Scedosporium apiospermum. Our report highlights the importance of molecular methods in conjunction with culture and histologic findings for diagnosing coinfections caused by infrequent etiologic agents. Additionally, we provide a comprehensive literature review of Scedosporium apiospermum infections in dogs.

Ameliorated Viability of Lactic Acid Bacteria in Fruit Juice Isolated from Indigenous Dahi with Prebiotics (Asparagus falcatus and Zingiber officinale)

Dahi is a fermented milk product containing probiotic lactic acid bacteria. This study aimed to isolate, identify, and characterize lactic acid-producing bacteria from native Dahi and evaluate their viability in orange juice using natural prebiotics. Dahi samples were obtained from local shops in Chattogram and Bogura, Bangladesh. Lactic acid-producing bacteria were isolated using MRS (de Mann Rogosa and Sharpe) medium. The isolated bacteria were identified through colony morphology, biochemical tests, and probiotic characteristics. Molecular identification was performed using polymerase chain reaction (PCR) targeting conserved 16S rDNA regions. Isolates of the genus Lactobacillus and Lactococcus lactis sp. Lactis were confirmed and used to develop probiotic orange juice. Prebiotics (Asparagus falcatus and Zingiber officinale) were added to the juice to support probiotic growth. The inoculated cell’s viability and the juice’s physicochemical parameters were evaluated during fermentation (48 hours) and storage (28 days). All fruit juice samples showed a mean number of viable cells of at least 1×105 CFU/mL during the 48-hour fermentation and 28-day storage in the refrigerator. Using natural prebiotics positively affected the survival of lactic acid bacteria, as demonstrated by bacterial colony growth on Petri dishes. Developing probiotic fruit juice enriched with prebiotics could be an effective alternative for individuals allergic or intolerant to milk-based products. Incorporating lactic acid bacteria from native Dahi into orange juice, combined with natural prebiotics, resulted in viable probiotic cells throughout fermentation and storage.

Efficacy of graphene nanocomposites for air disinfection in dental clinics: A randomized controlled study.

Aerosols containing disease-causing microorganisms are produced during oral diagnosis and treatment can cause secondary contamination. To investigate the use of graphene material for air disinfection in dental clinics by leveraging its adsorption and antibacterial properties. Patients who received ultrasonic cleaning at our hospital from April 2023 to April 2024. They were randomly assigned to three groups (n = 20 each): Graphene nanocomposite material suction group (Group A), ordinary filter suction group (Group B), and no air suction device group (Group C). The air quality and air colony count in the clinic rooms were assessed before, during, and after the procedure. Additionally, bacterial colony counts were obtained from the air outlets of the suction devices and the filter screens in Groups A and B. Before ultrasonic cleaning, no significant differences in air quality PM2.5 and colony counts were observed among the three groups. However, significant differences in air quality PM2.5 and colony counts were noted among the three groups during ultrasonic cleaning and after ultrasonic treatment. Additionally, the number of colonies on the exhaust port of the suction device and the surface of the filter were significantly lower in Group A than in Group B (P = 0.000 and P = 0.000, respectively). Graphene nanocomposites can effectively sterilize the air in dental clinics by exerting their antimicrobial effects and may be used to reduce secondary pollution.

Hand Scrub Methods and Their Effect on Bacterial Flora

Background: Hand disinfection is a critical component of infection control in surgery. Various solutions and techniques are used for hand scrubbing, but these often produce conflicting results. Objectives: This study aims to compare the effectiveness of four different hand scrubbing techniques in reducing hand bacterial colonies. Methods: A total of 30 participants were selected through convenience sampling based on specific criteria. They were randomly assigned to perform one of four hand scrub techniques: (1) Iodine scrub alone; (2) Decocept alone; (3) a combination of iodine scrub followed by Decocept; and (4) a combination of Decocept followed by an iodine soak. Microorganism cultures were taken before, immediately after, and one hour after scrubbing. Staff satisfaction was measured after each method using the Visual Analog Scale (VAS). Results: The study examined the effectiveness of the four scrubbing techniques in reducing skin microorganism levels. Coagulase-negative Staphylococcus was the most frequently detected microorganism, appearing in the majority of cases, with no significant variation between the groups. While all scrubbing methods reduced microbial counts, no statistically significant differences were found between the techniques. Conclusions: The use of Decocept alone may be considered a viable alternative to other hand scrubbing methods in operating rooms.

Preliminary in vivo investigation of the mesenchymal stromal cell secretome as a novel treatment for methicillin-resistant Staphylococcus aureus in equine skin wounds.

We aimed to study the antimicrobial and pro-healing potential of equine mesenchymal stromal cell secreted products (i.e. secretome), collected as conditioned media (mesenchymal stromal cell-conditioned media, MSC CM), in a novel in vivo model of methicillin-resistant Staphylococcus aureus (MRSA)-inoculated equine thorax wounds. Prospective in vivo study. Two Thoroughbred geldings. Six full-thickness cutaneous wounds were created bilaterally on the dorsal thorax of two horses (n = 12 wounds/horse). Wounds on the left thoraces were inoculated with MRSA on day 0. All wounds were then treated with either mupirocin ointment, MSC CM, or vehicle control (n = 4 wounds per group) once daily for 3 days. Photographs were taken to quantify wound scores and sizes, as well as samples to determine bacterial colony forming units (CFUs), at days 0, 1, 2, 3, 7, 14, 21, and 28. The wound edge was biopsied on days 0, 7, and 28, and scored histologically. Inoculated wounds had more bacterial CFUs at day 1 (p < .0001) and were larger in size at day 28 (p = .0009) than noninoculated wounds. Mupirocin-treated wounds were smaller than MSC CM and vehicle control-treated wounds at day 28 (p = .003). Mesenchymal stromal cell-conditioned media did not affect CFU numbers in inoculated and noninoculated wounds. Moreover, MSC CM did not affect the parameters of wound size or gross or microscopic wound scores over time. Mesenchymal stromal cell-conditioned media did not exhibit antimicrobial or pro-healing properties in the current study; however, the in vivo model of inoculated equine thorax wounds requires further optimization. This pilot study contributes to a growing understanding of the equine MSC secretome as an antimicrobial and pro-healing therapeutic for equine wounds.