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Frontiers in Veterinary Science 2024Raw diets have become popular in companion animal nutrition, but these diets may be contaminated with harmful bacteria because heat processing is not utilized to...
INTRODUCTION
Raw diets have become popular in companion animal nutrition, but these diets may be contaminated with harmful bacteria because heat processing is not utilized to mitigate pathogens during the production process. We analyzed 24 commercially available frozen raw canine and feline diets for extended-spectrum beta-lactamase-producing Enterobacterales (ESBL-E).
METHODS
Samples were incubated in tryptic soy broth augmented with 50 μg/mL ampicillin to enrich for ESBL-E. ESBL-E were isolated using CHROMagar ESBL plates and isolate identification and antibiotic susceptibility testing were confirmed using the VITEK2 instrument.
RESULTS
ESBL-E were isolated from 42% (10/24) of raw diets, with complex and predominating. Most ESBL-E isolates (71%, 32/45) were multidrug-resistant. Direct plating of samples onto tryptic soy agar yielded bacterial counts >6 log for 2 samples from two different manufacturers.
CONCLUSION
This preliminary study justifies further investigation into the potential contribution of raw diets to the dissemination of antibiotic resistant bacteria in companion animals and domestic living spaces.
PubMed: 38933698
DOI: 10.3389/fvets.2024.1294575 -
Frontiers in Pharmacology 2024Antibiotic resistance has emerged as a global concern. Xiyanping injection (XYP), a traditional Chinese medicine injection, has been extensively utilized for the...
Potential efficacy and safety of Xiyanping injection as adjuvant therapy in treatment of suppurative acute tonsillitis: a meta-analysis, trial sequential analysis, and certainty of evidence.
Antibiotic resistance has emerged as a global concern. Xiyanping injection (XYP), a traditional Chinese medicine injection, has been extensively utilized for the treatment of suppurative acute tonsillitis (SAT) in China, exhibiting clinical efficacy. Consequently, there is a need for further evaluation of the potential effectiveness and safety of this treatment. This meta-analysis consolidated data from multiple independent studies to assess the overall treatment efficacy of XYP as adjuvant therapy in patients with SAT. The search for randomized controlled trials (RCTs) encompassed databases from their inception to 1 April 2024, including the Cochrane Library, PubMed, Embase, SinoMed, CNKI, Wanfang, VIP, and CBM. Data extraction, methodological quality assessment, and meta-analysis were performed independently by two researchers. Review Manager 5.4 was used for data analysis. Various tools were employed for assessment, including forest plots to visualize results, funnel plots to detect publication bias, trial sequential analysis to estimate sample size, and GRADE to evaluate evidence quality. A comprehensive analysis of 32 RCTs involving 4,265 cases was conducted. When compared to conventional treatments (CTs; β-lactams/clindamycin hydrochloride injection/ribavirin) alone, the combination of XYP with CTs demonstrated significant reductions in symptom duration. This included sore throat (MD = -21.08, 95% CI: -24.86 to -17.29, < 0.00001), disappearance of tonsillar redness and swelling (mean difference [MD] = -20.28, 95% confidence interval [CI]: -30.05 to -10.52, < 0.0001), tonsil purulent discharge (MD = -22.40, 95% CI: -28.04 to -16.75, < 0.00001), and normalization of temperature (MD = -19.48, 95% CI: -22.49 to -16.47, < 0.00001). Furthermore, patients receiving CTs combined with XYP exhibited lower levels of interleukin-6 (MD = -7.64, 95% CI: 8.41 to -6.87, < 0.00001) and interleukin-8 (MD = -5.23, 95% CI: -5.60 to -4.86, < 0.00001) than those receiving CTs alone. Additionally, the combination therapy significantly improved the recovery rate (relative risk [RR] = 1.55, 95% CI: 1.37 to 1.77, < 0.00001), white blood cell count recovery rate (RR = 1.13, 95% CI: 1.04 to 1.23, = 0.004), and disappearance rate of tonsillar redness and swelling (RR = 0.51, 95% CI: 1.14 to 1.38, < 0.00001), with no significant increase in adverse events (RR = 0.47, 95% CI: 0.20 to 1.10, = 0.08). The current systematic review and meta-analysis tentatively suggest that the combination of XYP and CTs yields superior clinical outcomes for patients with SAT compared to CTs alone, with a favorable safety profile. Nonetheless, these findings warrant further confirmation through more rigorous RCTs, given the notable heterogeneity and publication bias observed in the included studies. https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID=296118, identifier CRD42022296118.
PubMed: 38933666
DOI: 10.3389/fphar.2024.1327856 -
Frontiers in Immunology 2024Community-acquired pneumonia (CAP) is a global health concern, with 25% of cases attributed to (). Viral infections like influenza A virus (IAV), respiratory syncytial...
INTRODUCTION
Community-acquired pneumonia (CAP) is a global health concern, with 25% of cases attributed to (). Viral infections like influenza A virus (IAV), respiratory syncytial virus (RSV), and human metapneumovirus (hMPV) increase the risk of , leading to severe complications due to compromised host immunity.
METHODS
We evaluated the efficacy of an anti-PhtD monoclonal antibody (mAb) cocktail therapy (PhtD3 + 7) in improving survival rates in three viral/bacterial coinfection models: IAV/, hMPV/, and RSV/.
RESULTS
The PhtD3 + 7 mAb cocktail outperformed antiviral mAbs, resulting in prolonged survival. In the IAV/ model, it reduced bacterial titers in blood and lungs by 2-4 logs. In the hMPV/ model, PhtD3 + 7 provided greater protection than the hMPV-neutralizing mAb MPV467, significantly reducing bacterial titers. In the RSV/ model, PhtD3 + 7 offered slightly better protection than the antiviral mAb D25, uniquely decreasing bacterial titers in blood and lungs.
DISCUSSION
Given the threat of antibiotic resistance, our findings highlight the potential of anti-PhtD mAb therapy as an effective option for treating viral and secondary pneumococcal coinfections.
Topics: Animals; Humans; Antibodies, Monoclonal; Streptococcus pneumoniae; Mice; Superinfection; Coinfection; Respiratory Syncytial Virus Infections; Metapneumovirus; Influenza A virus; Disease Models, Animal; Pneumococcal Infections; Female; Mice, Inbred BALB C; Paramyxoviridae Infections; Antibodies, Viral
PubMed: 38933273
DOI: 10.3389/fimmu.2024.1364622 -
Frontiers in Microbiology 2024Antimicrobial resistance is increasingly becoming a global health concern. This study aimed to investigate and report MDR prevalence, resistance, and virulence genes...
INTRODUCTION
Antimicrobial resistance is increasingly becoming a global health concern. This study aimed to investigate and report MDR prevalence, resistance, and virulence genes from poultry in Jos, Plateau State, Nigeria.
METHODS
The samples were analyzed using microbiological standard methods and polymerase chain reactions (PCRs).
RESULTS
A total of 179 cloacal swabs were collected from bothlocal and exotic poultry breeds, of which 99.4% (178/179) tested positive for . Among these culturally identified samples, 99.4% (177/178) were furtherconfirmed with a molecular weight of 401 bp. Multidrugresistance of 45% (80/178) was observed from the confirmed isolates. PCR assays were conducted to detect genes associated with resistance to antibiotics, specifically, tetracycline ( gene), sulfonamide ( gene), ampicillin ( gene), and quinolone ( gene). Antimicrobial susceptibility test (AST) results revealed substantial antibiotic resistance, with 81.9% (145/177) of the isolates being resistant to tetracycline, 80.2% (142/177) to quinolone, 69.5% (123/177) to sulfonamide, and 66.1% (117/177) to ampicillin. Further analysis on 18 isolates that showed resistance to up to four different antibiotics was carried out using multiplex PCR to detect and virulence genes. The study found that 44.4% (15/18) of the isolates were positive for the gene, 27.7% (5/18) for , 22.2% (4/18) for gene, and 5.5% (1) for gene, and none tested positive for gene.
CONCLUSION
These results showed high antibiotic resistance, virulent genes, and significant levels of MDR in from poultry. This study highlights the urgent need for antimicrobial stewardship practices within the poultry industry due to their profound implications for food safety and public health. This issue is particularly critical in Nigeria, where poultry farming constitutes a significant portion of smallholder farming practices.
PubMed: 38933030
DOI: 10.3389/fmicb.2024.1298582 -
Zhongguo Ying Yong Sheng Li Xue Za Zhi... Jun 2024A major worldwide health problem, Helicobacter Pylori (H. pylori) infection is associated with a number of gastrointestinal disorders, such as gastric cancer and peptic... (Review)
Review
A major worldwide health problem, Helicobacter Pylori (H. pylori) infection is associated with a number of gastrointestinal disorders, such as gastric cancer and peptic ulcers. The shortcomings of traditional treatment plans often include adverse effects, low patient compliance, and the emergence of antibiotic resistance. Investigating different delivery methods is thus necessary to improve the effectiveness of treatment. Mucoadhesive microspheres show promise as a method for delivering anti H. pylori drugs in a targeted and sustained manner. With their ability to stick to the stomach mucosa, these microspheres increase the local concentration of the medication and guarantee a more thorough removal of the pathogen. The potential of Mucoadhesive microspheres in the management of H. pylori infection is examined in this review. We explore the properties and benefits of Mucoadhesive polymers, the production techniques for microspheres, and the variables affecting their functionality. To provide a thorough grasp of this delivery system, a variety of drug-loading strategies, release mechanisms, and in vitro and in vivo assessment methodologies are covered. The potential of Mucoadhesive microspheres to overcome the drawbacks of traditional therapy is shown by highlighting recent developments in their formulation and their therapeutic consequences. Mucoadhesive microspheres constitute an important advancement in the treatment of Helicobacter pylori because they guarantee a regulated release of antibiotics and improve medication absorption at the site of infection. In order to fully appreciate the advantages of this novel delivery method, further study is necessary. Future research paths and the difficulties in the clinical translation of this technology are also discussed.
Topics: Helicobacter pylori; Microspheres; Helicobacter Infections; Drug Delivery Systems; Humans; Gastric Mucosa; Anti-Bacterial Agents
PubMed: 38932601
DOI: 10.62958/j.cjap.2024.006 -
Vaccines Jun 2024Serovar Typhi Ty21a (Ty21a) is the only licensed oral vaccine against typhoid fever. Due to its excellent safety profile, it has been used as a promising vector strain...
Serovar Typhi Ty21a (Ty21a) is the only licensed oral vaccine against typhoid fever. Due to its excellent safety profile, it has been used as a promising vector strain for the expression of heterologous antigens for mucosal immunization. As the efficacy of any bacterial live vector vaccine correlates with its ability to express and present sufficient antigen, the genes for antigen expression are traditionally located on plasmids with antibiotic resistance genes for stabilization. However, for use in humans, antibiotic selection of plasmids is not applicable, leading to segregational loss of the antigen-producing plasmid. Therefore, we developed an oral Ty21a-based vaccine platform technology, the JMU-SalVac-system (Julius-Maximilians-Universität Würzburg) in which the antigen delivery plasmids (pSalVac-plasmid-series) are stabilized by a Δ/-based balanced-lethal system (BLS). The system is made up of the chromosomal knockout of the essential tyrosyl-tRNA-synthetase gene () and the in trans complementation of on the pSalVac-plasmid. Further novel functional features of the pSalVac-plasmids are the presence of two different expression cassettes for the expression of protein antigens. In this study, we present the construction of vaccine strains with BLS plasmids for antigen expression. The expression of cytosolic and secreted mRFP and cholera toxin subunit B (CTB) proteins as model antigens is used to demonstrate the versatility of the approach. As proof of concept, we show the induction of previously described in vivo inducible promoters cloned into pSalVac-plasmids during infection of primary macrophages and demonstrate the expression of model vaccine antigens in these relevant human target cells. Therefore, antigen delivery strains developed with the JMU-SalVac technology are promising, safe and stable vaccine strains to be used against mucosal infections in humans.
PubMed: 38932416
DOI: 10.3390/vaccines12060687 -
Vaccines Jun 2024(Pg), a Gram-negative anaerobic bacterium found in dental plaque biofilm within periodontal pockets, is the primary pathogenic microorganism responsible for chronic... (Review)
Review
(Pg), a Gram-negative anaerobic bacterium found in dental plaque biofilm within periodontal pockets, is the primary pathogenic microorganism responsible for chronic periodontitis. Infection by Pg significantly impacts the development and progression of various diseases, underscoring the importance of eliminating this bacterium for effective clinical treatment. While antibiotics are commonly used to combat Pg, the rise of antibiotic resistance poses a challenge to complete eradication. Thus, the prevention of Pg infection is paramount. Research suggests that surface antigens of Pg, such as fimbriae, outer membrane proteins, and gingipains, can potentially be utilized as vaccine antigens to trigger protective immune responses. This article overviews these antigens, discusses advancements in mucosal adjuvants (including immunostimulant adjuvants and vaccine-delivery adjuvants), and their application in Pg vaccine development. Furthermore, the review examines the advantages and disadvantages of different immune pathways and common routes of Pg vaccine immunization. By summarizing the current landscape of Pg vaccines, addressing existing challenges, and highlighting the potential of mucosal vaccines, this review offers new insights for the advancement and clinical implementation of Pg vaccines.
PubMed: 38932348
DOI: 10.3390/vaccines12060619 -
Viruses Jun 2024The human immunodeficiency virus type-1 epidemic in Pakistan has significantly increased over the last two decades. In Karachi, Pakistan, there is a lack of updated...
The human immunodeficiency virus type-1 epidemic in Pakistan has significantly increased over the last two decades. In Karachi, Pakistan, there is a lack of updated information on the complexity of HIV-1 genetic diversity and the burden of drug resistance mutations (DRMs) that can contribute to ART failure and poor treatment outcomes. This study aimed to determine HIV-1 genetic diversity and identify drug-resistance mutations among people living with HIV in Karachi. A total of 364 HIV-positive individuals, with a median age of 36 years, were enrolled in the study. The HIV-1 partial gene was successfully sequenced from 268 individuals. The sequences were used to generate phylogenetic trees to determine clade diversity and also to assess the burden of DRMs. Based on the partial sequences, 13 distinct HIV-1 subtypes and recombinant forms were identified. Subtype A1 was the most common clade (40%), followed by CRF02_AG (33.2%). Acquired DRMs were found in 30.6% of the ART-experienced patients, of whom 70.7%, 20.7%, and 8.5% were associated with resistance to NNRTIs, NRTIs, and PIs, respectively. Transmitted DRMs were found in 5.6% of the ART-naïve patients, of whom 93% were associated with resistance against NNRTIs and 7% to PIs. The high prevalence of DRMs in ART-experienced patients poses significant challenges to the long-term benefits and sustainability of the ART program. This study emphasizes the importance of continuous HIV molecular epidemiology and drug resistance surveillance to support evidence-based HIV prevention, precise ART, and targeted AIDS care.
Topics: Humans; HIV-1; Pakistan; HIV Infections; Drug Resistance, Viral; Adult; Male; Female; Genetic Variation; Mutation; Phylogeny; Anti-HIV Agents; Middle Aged; Young Adult; Genotype; Adolescent
PubMed: 38932254
DOI: 10.3390/v16060962 -
Viruses May 2024Bacteriophages (phages) are viruses that infect the bacteria within which their reproduction cycle takes place, a process that ends in the lysis and death of the...
Bacteriophages (phages) are viruses that infect the bacteria within which their reproduction cycle takes place, a process that ends in the lysis and death of the bacterial cell. Some phages are also able to destroy bacterial biofilms. Due to increased antibiotics resistance, , another biofilm-forming pathogen, is a problem in many parts of the world. Zinc oxide (ZnO) and other metal nanoparticles (NPs) are biologically active and also possess anti-biofilm properties. ZnO-NPs were prepared by the green synthesis method using orange peels. The vibrational peaks of the ZnO-NPs were analyzed using FTIR analysis, and their size and morphological properties were determined using scanning electron microscopy (SEM). The ability of the ZnO-NPs to reduce or eliminate biofilm alone or in combination with phages PB10 and PA19 was investigated. The cells were effectively killed in the preformed 48 h biofilms during a 24 h incubation with the ZnO-NP-phage combination, in comparison with the control or ZnO-NPs alone. The treatments on growing biofilms were most efficient in the final stages of biofilm development. All five treatment groups showed a significant biofilm reduction compared to the control group ( < 0.0001) at 48 h of incubation. The influence of the ZnO-NPs and phages on the quorum sensing system of was monitored by quantitative real-time PCR (qRT-PCR) of the autoinducer biosynthesis gene . While the ZnO-NPs repressed the gene transcription, the phages slightly activated it at 24 and 48 h of incubation. Also, the effect of the ZnO-NPs and phage PA19 on the viability of HFF2 cells was investigated and the results showed that the combination of NPs with PA19 reduced the toxic effect of ZnO-NPs and also stimulated the growth in normal cells.
Topics: Zinc Oxide; Pseudomonas aeruginosa; Biofilms; Metal Nanoparticles; Green Chemistry Technology; Bacteriophages; Anti-Bacterial Agents; Nanoparticles
PubMed: 38932188
DOI: 10.3390/v16060897 -
Viruses May 2024Filamentous bacteriophages belonging to the order , family , significantly affect the properties of Gram-negative bacteria, but filamentous phages of many important...
Filamentous bacteriophages belonging to the order , family , significantly affect the properties of Gram-negative bacteria, but filamentous phages of many important pathogens have not been described so far. The aim of this study was to examine filamentous phages for the first time and to determine their effect on bacterial virulence. The filamentous phages were detected in 15.3% of strains as individual prophages in the genome or as tandem repeats, and a slightly higher percentage was detected in the culture collection (23.8%). The phylogenetic analyses revealed 12 new genera within the family. Bacteriophages that were selected and isolated showed structural and genomic characteristics of the family and were unable to form plaques. Upon host infection, these phages did not significantly affect bacterial twitching motility and capsule production but significantly affected growth kinetics, reduced biofilm formation, and increased antibiotic sensitivity. One of the possible mechanisms of reduced resistance to antibiotics is the observed decreased expression of efflux pumps after infection with filamentous phages.
Topics: Acinetobacter baumannii; Phylogeny; Genome, Viral; Biofilms; Inovirus; Host Specificity; Anti-Bacterial Agents; Virulence; Bacteriophages; Prophages
PubMed: 38932150
DOI: 10.3390/v16060857