-
Frontiers in Cellular and Infection... 2024
Topics: Humans; Anti-Bacterial Agents; Drug Resistance, Bacterial; Drug Resistance, Microbial; Anti-Infective Agents; Bacterial Infections; Bacteria
PubMed: 38895736
DOI: 10.3389/fcimb.2024.1434140 -
Current Opinion in Microbiology Aug 2023Bacteria are single-celled organisms, but the survival of microbial communities relies on complex dynamics at the molecular, cellular, and ecosystem scales. Antibiotic... (Review)
Review
Bacteria are single-celled organisms, but the survival of microbial communities relies on complex dynamics at the molecular, cellular, and ecosystem scales. Antibiotic resistance, in particular, is not just a property of individual bacteria or even single-strain populations, but depends heavily on the community context. Collective community dynamics can lead to counterintuitive eco-evolutionary effects like survival of less resistant bacterial populations, slowing of resistance evolution, or population collapse, yet these surprising behaviors are often captured by simple mathematical models. In this review, we highlight recent progress - in many cases, advances driven by elegant combinations of quantitative experiments and theoretical models - in understanding how interactions between bacteria and with the environment affect antibiotic resistance, from single-species populations to multispecies communities embedded in an ecosystem.
Topics: Anti-Bacterial Agents; Drug Resistance, Microbial; Models, Theoretical; Microbiota; Bacteria
PubMed: 37054512
DOI: 10.1016/j.mib.2023.102306 -
Current Opinion in Microbiology Oct 2023Bacterial pathogens are constantly evolving new resistance mechanisms against antibiotics; hence, strategies to potentiate existing antibiotics or combat mechanisms of... (Review)
Review
Bacterial pathogens are constantly evolving new resistance mechanisms against antibiotics; hence, strategies to potentiate existing antibiotics or combat mechanisms of resistance using adjuvants are always in demand. Recently, inhibitors have been identified that counteract enzymatic modification of the drugs isoniazid and rifampin, which have implications in the study of multi-drug-resistant mycobacteria. A wealth of structural studies on efflux pumps from diverse bacteria has also fueled the design of new small-molecule and peptide-based agents to prevent the active transport of antibiotics. We envision that these findings will inspire microbiologists to apply existing adjuvants to clinically relevant resistant strains, or to use described platforms to discover novel antibiotic adjuvant scaffolds.
Topics: Bacteria; Anti-Bacterial Agents; Drug Resistance, Microbial; Biological Transport; Drug Resistance, Multiple, Bacterial
PubMed: 37329679
DOI: 10.1016/j.mib.2023.102334 -
American Journal of Infection Control Jul 2023Hospital acquired infections pose a significant risk for patients undergoing hematopoietic stem cell transplantation. Horizontal transfer of antimicrobial resistance...
BACKGROUND
Hospital acquired infections pose a significant risk for patients undergoing hematopoietic stem cell transplantation. Horizontal transfer of antimicrobial resistance genes contributes to prevalence of multidrug-resistant infections in this patient population.
METHODS
At an academic bone marrow transplantation center, we performed whole genome DNA sequencing (WGS) on commonly used physician items, including badges, stethoscopes, soles of shoes, and smart phones from 6 physicians. Data were analyzed to determine antimicrobial resistance and virulence factor genes.
RESULTS
A total of 1,126 unique bacterial species, 495 distinct bacteriophages, 91 unique DNA viruses, and 175 fungal species were observed. Every item contained bacteria with antibiotic and/or antiseptic resistance genes. Stethoscopes contained greatest frequency of antibiotic resistance and more plasmid-carriage of antibiotic resistance.
DISCUSSION AND CONCLUSIONS
These data indicate that physician examination tools and personal items possess potentially pathogenic microbes. Infection prevention policies must consider availability of resources to clean physical examination tools as well as provider awareness when enacting hospital policies. Additionally, the prevalence of antimicrobial resistance genes (eg, encoding resistance to aminoglycosides, β-lactams, and quinolones) reinforces need for antimicrobial stewardship, including for immunocompromised patients. Further research is needed to assess whether minute quantities of microbes on physician objects detectable by WGS represents clinically significant inoculums for immunocompromised patients.
Topics: Humans; Plasmids; Anti-Bacterial Agents; Bacteria; Drug Resistance, Microbial; beta-Lactams; Drug Resistance, Multiple, Bacterial; Microbial Sensitivity Tests
PubMed: 36306861
DOI: 10.1016/j.ajic.2022.10.007 -
Frontiers in Cellular and Infection... 2023
Topics: Humans; Helicobacter Infections; Helicobacter pylori; Anti-Bacterial Agents; Gastritis; Drug Resistance, Microbial
PubMed: 37850053
DOI: 10.3389/fcimb.2023.1296784 -
Microbiome Jul 2023The resistome, the collection of antibiotic resistance genes (ARGs) in a microbiome, is increasingly recognised as relevant to the development of clinically relevant...
BACKGROUND
The resistome, the collection of antibiotic resistance genes (ARGs) in a microbiome, is increasingly recognised as relevant to the development of clinically relevant antibiotic resistance. Many metagenomic studies have reported resistome differences between groups, often in connection with disease and/or antibiotic treatment. However, the consistency of resistome associations with antibiotic- and non-antibiotic-treated diseases has not been established. In this study, we re-analysed human gut microbiome data from 26 case-control studies to assess the link between disease and the resistome.
RESULTS
The human gut resistome is highly variable between individuals both within and between studies, but may also vary significantly between case and control groups even in the absence of large taxonomic differences. We found that for diseases commonly treated with antibiotics, namely cystic fibrosis and diarrhoea, patient microbiomes had significantly elevated ARG abundances compared to controls. Disease-associated resistome expansion was found even when ARG abundance was high in controls, suggesting ongoing and additive ARG acquisition in disease-associated strains. We also found a trend for increased ARG abundance in cases from some studies on diseases that are not treated with antibiotics, such as colorectal cancer.
CONCLUSIONS
Diseases commonly treated with antibiotics are associated with expanded gut resistomes, suggesting that historical exposure to antibiotics has exerted considerable selective pressure for ARG acquisition in disease-associated strains. Video Abstract.
Topics: Humans; Gastrointestinal Microbiome; Microbiota; Anti-Bacterial Agents; Drug Resistance, Microbial; Genes, Bacterial
PubMed: 37507809
DOI: 10.1186/s40168-023-01610-1 -
Environment International Nov 2023Cyanobacterial harmful algal blooms (cyanoHABs), which are a form of microbial dysbiosis in freshwater environments, are an emerging environmental and public health...
Cyanobacterial harmful algal blooms (cyanoHABs), which are a form of microbial dysbiosis in freshwater environments, are an emerging environmental and public health concern. Additionally, the freshwater environment serves as a reservoir of antibiotic resistance genes (ARGs), which pose a risk of transmission during microbial dysbiosis, such as cyanoHABs. However, the interactions between potential synergistic pollutants, cyanoHABs, and ARGs remain poorly understood. During cyanoHABs, Microcystis and high microcystin levels were dominant in all the nine regions of the river sampled. The resistome, mobilome, and microbiome were interrelated and linked to the physicochemical properties of freshwater. Planktothrix and Pseudanabaena competed with Actinobacteriota and Proteobacteria during cyanoHABs. Forty two ARG carriers were identified, most of which belonged to Actinobacteriota and Proteobacteria. ARG carriers showed a strong correlation with ARGs density, which decreased with the severity of cyanoHAB. Although ARGs decreased due to a reduction of ARG carriers during cyanoHABs, mobile gene elements (MGEs) and virulence factors (VFs) genes increased. We explored the relationship between cyanoHABs and ARGs for potential synergistic interaction. Our findings demonstrated that cyanobacteria compete with freshwater commensal bacteria such as Actinobacteriota and Proteobacteria, which carry ARGs in freshwater, resulting in a reduction of ARGs levels. Moreover, cyanoHABs generate biotic and abiotic stress in the freshwater microbiome, which may lead to an increase in MGEs and VFs. Exploration of the intricate interplays between microbiome, resistome, mobilome, and pathobiome during cyanoHABs not only revealed that the mechanisms underlying the dynamics of microbial dysbiosis but also emphasizes the need to prioritize the prevention of microbial dysbiosis in the risk management of ARGs.
Topics: Humans; Anti-Bacterial Agents; Dysbiosis; Cyanobacteria; Drug Resistance, Microbial; Microcystis; Genes, Bacterial
PubMed: 37897871
DOI: 10.1016/j.envint.2023.108268 -
Comprehensive Reviews in Food Science... Jul 2023The emergence of antibiotic-resistant bacteria due to the overuse or inappropriate use of antibiotics has become a significant public health concern. The agri-food... (Review)
Review
The emergence of antibiotic-resistant bacteria due to the overuse or inappropriate use of antibiotics has become a significant public health concern. The agri-food chain, which serves as a vital link between the environment, food, and human, contributes to the large-scale dissemination of antibiotic resistance, posing a concern to both food safety and human health. Identification and evaluation of antibiotic resistance of foodborne bacteria is a crucial priority to avoid antibiotic abuse and ensure food safety. However, the conventional approach for detecting antibiotic resistance heavily relies on culture-based methods, which are laborious and time-consuming. Therefore, there is an urgent need to develop accurate and rapid tools for diagnosing antibiotic resistance in foodborne pathogens. This review aims to provide an overview of the mechanisms of antibiotic resistance at both phenotypic and genetic levels, with a focus on identifying potential biomarkers for diagnosing antibiotic resistance in foodborne pathogens. Furthermore, an overview of advances in the strategies based on the potential biomarkers (antibiotic resistance genes, antibiotic resistance-associated mutations, antibiotic resistance phenotypes) for antibiotic resistance analysis of foodborne pathogens is systematically exhibited. This work aims to provide guidance for the advancement of efficient and accurate diagnostic techniques for antibiotic resistance analysis in the food industry.
Topics: Humans; Food Microbiology; Anti-Bacterial Agents; Drug Resistance, Microbial; Bacteria; Phenotype; Biomarkers
PubMed: 37222539
DOI: 10.1111/1541-4337.13181 -
Environmental Pollution (Barking, Essex... Nov 2023The surge of Antibiotic Resistant Bacteria (ARB) in the environment is poised to be the next health threat. World Health Organisation's (WHO's) Global Antimicrobial...
The surge of Antibiotic Resistant Bacteria (ARB) in the environment is poised to be the next health threat. World Health Organisation's (WHO's) Global Antimicrobial Surveillance System (GLASS) report indicates that developing countries may be at a greater risk. Among various factors, the major driver here could be untreated wastewater and poor sanitation. Bacteria are extremely adaptable to their surroundings and develop Antimicrobial Resistance (AMR) when exposed to antibiotics and other pollutants that cause microbial stress. Thus, untreated domestic wastewater drains could easily become hotspots for the occurrence of ARBs. This study reports surveillance of sewage-carrying drains across four urban cities in India and demonstrated the presence of ARBs in the bacterial community against 7 classes of antibiotics, namely, β-Lactams, Chloramphenicol, Glycopeptides, Macrolides, Tetracycline, Third Generation Cephalosporin, and Quinolones. Untreated domestic wastewater flowing in target drains was collected twice a month, for a period of six months and the microbial community was subjected to Antibiotic Susceptibility Testing (AST) by plate assays. The zone of inhibition was recorded and interpreted as per the interpretive chart of The Clinical & Laboratory Standards Institute (CLSI) & The European Committee on Antimicrobial Susceptibility Testing (EUCAST). The total number of samples showing resistance against antibiotics was used to define an Antibiotic Resistance Index (ARI), calculated for all 20 sampling sites (drains). Results demonstrated that the highest ARI was observed in Delhi and Mumbai, ranging from 0.81 to 0.92 in Delhi and 0.49-0.56 in Mumbai. This surveillance study reveals the antibiotic resistance pattern of the representative bacterial community in the drains and goes beyond few targeted bacterial species. The alarming presence of antibiotic resistant bacterial community highlights the concern of ARBs being the next looming health threat. This report aims to demonstrates the importance of considering sewage surveillance on routine basis by state authorities.
Topics: Wastewater; Angiotensin Receptor Antagonists; Angiotensin-Converting Enzyme Inhibitors; Anti-Bacterial Agents; Drug Resistance, Microbial; Bacteria; Drug Resistance, Bacterial
PubMed: 37741538
DOI: 10.1016/j.envpol.2023.122586 -
Integrative Zoology Nov 2023There is now general concern about widespread antibiotic resistance, and growing evidence indicates that gut microbiota is critical in providing antibiotic resistance.... (Review)
Review
There is now general concern about widespread antibiotic resistance, and growing evidence indicates that gut microbiota is critical in providing antibiotic resistance. Honeybee is an important pollinator; the incidence of antibiotic resistance genes in honeybee gut causes potential risks to not only its own health but also to public and animal health, for its potential disseminator role, thus receiving more attention from the public. Recent analysis results reveal that the gut of honeybee serves as a reservoir of antibiotic resistance genes, probably due to antibiotics application history in beekeeping and horizontal gene transfer from the highly polluted environment. These antibiotic resistance genes accumulate in the honeybee gut and could be transferred to the pathogen, even having the potential to spread during pollination, tending, social interactions, etc. Newly acquired resistance traits may cause fitness reduction in bacteria whereas facilitating adaptive evolution as well. This review outlines the current knowledge about the resistome in honeybee gut and emphasizes its role in antibiotic resistance dissemination.
Topics: Animals; Bees; Drug Resistance, Microbial; Bacteria; Anti-Bacterial Agents; Gastrointestinal Microbiome
PubMed: 36892101
DOI: 10.1111/1749-4877.12714