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Bacterial resistance to known and currently used antibiotics represents a growing issue worldwide. It poses a major problem in the treatment of infectious diseases in general and hospital-acquired infections in particular. This is in part due to the overuse and misuse of antibiotics in past decades, which led to the selection of highly resistant bacteria and even so-called superbugs – multidrug-resistant (MDR) bacteria. Nosocomial infections, particularly, are often caused by MDR bacterial pathogens and the treatment of such infections is very complicated and extensive, often leading to various side effects, including adverse effects on the natural human microbiome. At the same time, the development of novel antibiotics is lagging with very few new ones in the pipeline. Finding viable alternatives to treat such infections may help to overcome these therapeutic issues. This publication brings novel developments in the field of bacterial resistance, mainly in the hospital settings, adequate antibiotic therapy, and identification of compounds useful to battle this growing issue.

Medicine --- Epidemiology & medical statistics --- VRE --- GIT --- hemato-oncological patients --- clonality --- antibiotic stewardship --- resistance --- consumption of antibiotics --- clonal spread --- Enterococcus faecium --- Enterococcus faecalis --- linezolid resistance --- 23S rRNA --- optrA --- carbapenem-resistant Klebsiella pneumoniae --- carbapenem-resistant Acinetobacter baumannii --- N-acetylcysteine --- septic shock --- critically ill patients --- newborn --- infection --- bacteria --- antibiotic therapy --- hops --- C. difficile --- rat model --- Staphylococcus aureus --- MRSA --- spa typing --- MLST --- SCCmec typing --- clonal analysis --- epidemiology --- cancer patients --- duration of treatment --- colistin --- propensity score analysis --- multidrug-resistant Acinetobacter baumannii --- urinary tract infections --- UTIs --- MDR --- Escherichia coli --- Klebsiella --- uropathogens --- AMR --- antibiotic resistance --- ESBL-producing Klebsiella pneumoniae --- urinary tract infection --- clinical impact --- economic impact --- ventilator-associated pneumonia --- Klebsiella spp. --- Escherichia spp. --- pulsed-field gel electrophoresis (PFGE) --- endogenous infection --- methicillin-resistant --- porcine model --- methicillin-resistant Staphylococcus aureus (MRSA) --- long term care facilities (LTCF) --- multidrug resistance (MDR) --- enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) --- ESBL --- PCR --- primer --- antimicrobial resistance --- infection prevention and control --- antimicrobial stewardship --- hospital --- cluster analysis --- principal component analysis

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Bacterial resistance to known and currently used antibiotics represents a growing issue worldwide. It poses a major problem in the treatment of infectious diseases in general and hospital-acquired infections in particular. This is in part due to the overuse and misuse of antibiotics in past decades, which led to the selection of highly resistant bacteria and even so-called superbugs – multidrug-resistant (MDR) bacteria. Nosocomial infections, particularly, are often caused by MDR bacterial pathogens and the treatment of such infections is very complicated and extensive, often leading to various side effects, including adverse effects on the natural human microbiome. At the same time, the development of novel antibiotics is lagging with very few new ones in the pipeline. Finding viable alternatives to treat such infections may help to overcome these therapeutic issues. This publication brings novel developments in the field of bacterial resistance, mainly in the hospital settings, adequate antibiotic therapy, and identification of compounds useful to battle this growing issue.

Medicine --- Epidemiology & medical statistics --- VRE --- GIT --- hemato-oncological patients --- clonality --- antibiotic stewardship --- resistance --- consumption of antibiotics --- clonal spread --- Enterococcus faecium --- Enterococcus faecalis --- linezolid resistance --- 23S rRNA --- optrA --- carbapenem-resistant Klebsiella pneumoniae --- carbapenem-resistant Acinetobacter baumannii --- N-acetylcysteine --- septic shock --- critically ill patients --- newborn --- infection --- bacteria --- antibiotic therapy --- hops --- C. difficile --- rat model --- Staphylococcus aureus --- MRSA --- spa typing --- MLST --- SCCmec typing --- clonal analysis --- epidemiology --- cancer patients --- duration of treatment --- colistin --- propensity score analysis --- multidrug-resistant Acinetobacter baumannii --- urinary tract infections --- UTIs --- MDR --- Escherichia coli --- Klebsiella --- uropathogens --- AMR --- antibiotic resistance --- ESBL-producing Klebsiella pneumoniae --- urinary tract infection --- clinical impact --- economic impact --- ventilator-associated pneumonia --- Klebsiella spp. --- Escherichia spp. --- pulsed-field gel electrophoresis (PFGE) --- endogenous infection --- methicillin-resistant --- porcine model --- methicillin-resistant Staphylococcus aureus (MRSA) --- long term care facilities (LTCF) --- multidrug resistance (MDR) --- enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) --- ESBL --- PCR --- primer --- antimicrobial resistance --- infection prevention and control --- antimicrobial stewardship --- hospital --- cluster analysis --- principal component analysis --- VRE --- GIT --- hemato-oncological patients --- clonality --- antibiotic stewardship --- resistance --- consumption of antibiotics --- clonal spread --- Enterococcus faecium --- Enterococcus faecalis --- linezolid resistance --- 23S rRNA --- optrA --- carbapenem-resistant Klebsiella pneumoniae --- carbapenem-resistant Acinetobacter baumannii --- N-acetylcysteine --- septic shock --- critically ill patients --- newborn --- infection --- bacteria --- antibiotic therapy --- hops --- C. difficile --- rat model --- Staphylococcus aureus --- MRSA --- spa typing --- MLST --- SCCmec typing --- clonal analysis --- epidemiology --- cancer patients --- duration of treatment --- colistin --- propensity score analysis --- multidrug-resistant Acinetobacter baumannii --- urinary tract infections --- UTIs --- MDR --- Escherichia coli --- Klebsiella --- uropathogens --- AMR --- antibiotic resistance --- ESBL-producing Klebsiella pneumoniae --- urinary tract infection --- clinical impact --- economic impact --- ventilator-associated pneumonia --- Klebsiella spp. --- Escherichia spp. --- pulsed-field gel electrophoresis (PFGE) --- endogenous infection --- methicillin-resistant --- porcine model --- methicillin-resistant Staphylococcus aureus (MRSA) --- long term care facilities (LTCF) --- multidrug resistance (MDR) --- enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) --- ESBL --- PCR --- primer --- antimicrobial resistance --- infection prevention and control --- antimicrobial stewardship --- hospital --- cluster analysis --- principal component analysis

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The worldwide dissemination of antimicrobial-resistant bacteria, particularly those resistant to last-resource antibiotics, is a common problem to which no immediate solution is foreseen. In 2017, the World Health Organization (WHO) published a list of antimicrobial-resistant "priority pathogens", which include a group of microorganisms with high-level resistance to multiple drugs, named ESKAPE pathogens, comprising vancomycin-resistant Enterococcus faecium (VRE), methicillin- and vancomycin-resistant Staphylococcus aureus (MRSA and VRSA), extended spectrum β-lactamase (ESBL) or carbapenem-resistant Klebsiella pneumoniae, carbapenem-resistant Acinetobacter baumannii, carbapenem-resistant Pseudomonas aeruginosa and extended spectrum β-lactamase (ESBL) or carbapenem-resistant Enterobacter spp. These bacteria also have the ability to produce several virulence factors, which have a major influence on the outcomes of infectious diseases. Bacterial resistance and virulence are interrelated, since antibiotics pressure may influence bacterial virulence gene expression and, consequently, infection pathogenesis. Additionally, some virulence factors contribute to an increased resistance ability, as observed in biofilm-producing strains. The surveillance of important resistant and virulent clones and associated mobile genetic elements is essential to decision making in terms of mitigation measures to be applied for the prevention of such infections in both human and veterinary medicine, being also relevant to address the role of natural environments as important components of the dissemination cycle of these strains.

biocide --- antibiotic resistance --- cross-resistance --- aminoglycoside --- adaptation --- biofilm --- pyruvate cycle --- mastitis --- staphylococci --- virulence factors --- genes --- antimicrobial resistance --- infant --- newborn --- bacteremia --- Gram-negative bacteria --- drug resistance --- microbial --- mortality --- microcosm --- Aeromonas --- climate change --- temperature --- pH --- water --- Acinetobacter baumannii --- virulence --- whole-genome sequencing --- international high-risk clones --- genomic epidemiology --- dogs --- Escherichia coli --- ESBL --- CTX-M-15 --- CTX-M-1 --- CTX-M-32 --- CTX-M-55 --- CTX-M-14 --- qAmpC --- CMY-2 --- camel --- domestic --- milk --- virulence genes --- extended-spectrum β-lactamases --- biofilm formation --- Pseudomonas aeruginosa --- carbapenem resistance --- KPC-2 --- plasmid --- diabetic foot infections --- Staphylococcus aureus --- subinhibitory concentrations --- virulence-related genes

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The worldwide dissemination of antimicrobial-resistant bacteria, particularly those resistant to last-resource antibiotics, is a common problem to which no immediate solution is foreseen. In 2017, the World Health Organization (WHO) published a list of antimicrobial-resistant "priority pathogens", which include a group of microorganisms with high-level resistance to multiple drugs, named ESKAPE pathogens, comprising vancomycin-resistant Enterococcus faecium (VRE), methicillin- and vancomycin-resistant Staphylococcus aureus (MRSA and VRSA), extended spectrum β-lactamase (ESBL) or carbapenem-resistant Klebsiella pneumoniae, carbapenem-resistant Acinetobacter baumannii, carbapenem-resistant Pseudomonas aeruginosa and extended spectrum β-lactamase (ESBL) or carbapenem-resistant Enterobacter spp. These bacteria also have the ability to produce several virulence factors, which have a major influence on the outcomes of infectious diseases. Bacterial resistance and virulence are interrelated, since antibiotics pressure may influence bacterial virulence gene expression and, consequently, infection pathogenesis. Additionally, some virulence factors contribute to an increased resistance ability, as observed in biofilm-producing strains. The surveillance of important resistant and virulent clones and associated mobile genetic elements is essential to decision making in terms of mitigation measures to be applied for the prevention of such infections in both human and veterinary medicine, being also relevant to address the role of natural environments as important components of the dissemination cycle of these strains.

Research & information: general --- Biology, life sciences --- Microbiology (non-medical) --- biocide --- antibiotic resistance --- cross-resistance --- aminoglycoside --- adaptation --- biofilm --- pyruvate cycle --- mastitis --- staphylococci --- virulence factors --- genes --- antimicrobial resistance --- infant --- newborn --- bacteremia --- Gram-negative bacteria --- drug resistance --- microbial --- mortality --- microcosm --- Aeromonas --- climate change --- temperature --- pH --- water --- Acinetobacter baumannii --- virulence --- whole-genome sequencing --- international high-risk clones --- genomic epidemiology --- dogs --- Escherichia coli --- ESBL --- CTX-M-15 --- CTX-M-1 --- CTX-M-32 --- CTX-M-55 --- CTX-M-14 --- qAmpC --- CMY-2 --- camel --- domestic --- milk --- virulence genes --- extended-spectrum β-lactamases --- biofilm formation --- Pseudomonas aeruginosa --- carbapenem resistance --- KPC-2 --- plasmid --- diabetic foot infections --- Staphylococcus aureus --- subinhibitory concentrations --- virulence-related genes --- biocide --- antibiotic resistance --- cross-resistance --- aminoglycoside --- adaptation --- biofilm --- pyruvate cycle --- mastitis --- staphylococci --- virulence factors --- genes --- antimicrobial resistance --- infant --- newborn --- bacteremia --- Gram-negative bacteria --- drug resistance --- microbial --- mortality --- microcosm --- Aeromonas --- climate change --- temperature --- pH --- water --- Acinetobacter baumannii --- virulence --- whole-genome sequencing --- international high-risk clones --- genomic epidemiology --- dogs --- Escherichia coli --- ESBL --- CTX-M-15 --- CTX-M-1 --- CTX-M-32 --- CTX-M-55 --- CTX-M-14 --- qAmpC --- CMY-2 --- camel --- domestic --- milk --- virulence genes --- extended-spectrum β-lactamases --- biofilm formation --- Pseudomonas aeruginosa --- carbapenem resistance --- KPC-2 --- plasmid --- diabetic foot infections --- Staphylococcus aureus --- subinhibitory concentrations --- virulence-related genes

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Essential oils extracted by the distillation or hydrodistillation of aromatic plants are a complex mixture of volatile compounds with several biological activities. Their efficacy as antimicrobial agents is related to the activity of several natural compounds belonging to different chemical families that can act both in synergy with each other and with other antibiotics. The antibiotic resistance detected among pathogens has been quickly increasing in recent years, and the control of some of these microorganisms is becoming a planetary emergency for human and animal health. The control of the microbial growth is a problem of great importance also for the food industry (food deterioration and shelf life extension) and for the world of cultural heritage (indoor and outdoor phenomena of biodeterioration). Essential oils can play an important role in this scenario, due their recognized broad-spectrum antimicrobial activity. Therefore, the main subject of this Special Issue includes an essential oil-based approach to control microrganisms in areas such as human and veterinary medicine, entomology, food industry and agriculture. In addition, the chemical composition of essential oils from endemic and rare medicinal/aromatic plants, nanoformulations of essential oils, applications in human and veterinary medicine and its use as animal feeding supplements are topics covered in this Special Issue

Technology: general issues --- extracellular polymeric substance matrix --- cellulose synthesis --- enzyme inhibition --- essential oils --- Boswellia sacra --- frankincense essential oil --- GC/MS analysis --- antimicrobial activity --- Staphylococcus aureus --- Pseudomonas aeruginosa --- Propionibacterium acnes --- Candida albicans --- Malassezia furfur --- lamb --- carvacrol --- monensin --- meat tenderness --- TBARS --- essential oil --- genetic --- RAPD --- thyme --- Thymus quinquecostatus --- Thymus vulgaris --- Penicillium rubens --- growth inhibition --- RNA microarray --- gene expression --- metabolic pathway analysis --- Ferula --- GC --- chemometrics --- antioxidant activity --- Acinetobacter baumannii --- MDR --- biofilm --- antimicrobial --- Pimenta --- Myrtaceae --- wound infection --- eugenol --- 1,8-cineole --- GC/MS --- Salmonella --- Origanum vulgare --- ciprofloxacin --- poultry farms --- pig farms --- Staphylococcus spp. --- human semen --- antimicrobial resistance --- rosewood --- linalool --- marine bacteria --- ABTS --- Trypanosoma cruzi --- cytotoxicity --- nitrite --- nitric oxide --- antifungal activity --- nanoencapsulation --- poly(ε-caprolactone) --- Thymus capitatus --- Satureja montana --- Lavandula angustifolia --- Lavandula intermedia --- Origanum hirtum --- Monarda didyma --- Monarda fistulosa --- Alternaria alternata --- cucurbits --- Cymbopogon citratus --- GC-MS --- Stagonosporopsis cucurbitacearum --- n/a