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Microbiology (Reading, England) Sep 2020The genus , belonging to the phylum is one of the most important genera and comprises thermophilic bacteria. The genus was erected with the taxonomic reclassification...
The genus , belonging to the phylum is one of the most important genera and comprises thermophilic bacteria. The genus was erected with the taxonomic reclassification of various species. Taxonomic studies of remain in progress. However, there is no comprehensive review of the characteristic features, taxonomic status and study of various applications of this interesting genus. The main aim of this review is to give a comprehensive account of the genus . At present the genus acomprises 25 taxa, 14 validly published (with correct name), nine validly published (with synonyms) and two not validly published species. We describe only validly published species of the genera and . Vegetative cells of species are Gram-strain-positive or -variable, rod-shaped, motile, endospore-forming, aerobic or facultatively anaerobic, obligately thermophilic and chemo-organotrophic. Growth occurs in the pH range 6.08.5 and a temperature of 37-75 °C. The major cellular fatty acids are iso-C15:o, iso-C16:0 and iso-C17:o. The main menaquinone type is MK-7. The G-+C content of the DNA ranges between 48.2 and 58 mol%. The genus is widely distributed in nature, being mostly found in many extreme locations such as hot springs, hydrothermal vents, marine trenches, hay composts, etc. species have been widely exploited in various industrial and biotechnological applications, and thus are promising candidates for further studies in the future.
Topics: Bacillaceae; Biodegradation, Environmental; Biofuels; Biological Evolution; Biotechnology; CRISPR-Cas Systems; Extreme Environments; Geobacillus; Industrial Microbiology; Phylogeny; Temperature
PubMed: 32744496
DOI: 10.1099/mic.0.000945 -
Transplant Infectious Disease : An... Feb 2021Studies have suggested that in addition to antimicrobials, some non-antibiotics may alter the gut microbiome. This systematic review sought to determine if there is an...
INTRODUCTION
Studies have suggested that in addition to antimicrobials, some non-antibiotics may alter the gut microbiome. This systematic review sought to determine if there is an association between immunosuppressive agents used in recipients of solid organ transplants (SOT) and alterations in the gut microbiome.
METHODS
English language PubMed and Scopus searches were conducted to identify relevant articles. Inclusion criteria were defined as pertaining to solid organ transplantation, immunosuppression, and the gut microbiome. Articles were excluded if they contained only genetic microbiota descriptions, narrative reviews of bacteria, or described bacteria as a pathogen for infections. PRISMA reporting was used to guide this literature review.
RESULTS
A preliminary search identified 665 articles, of which 75 articles met the inclusion criteria, and 10 articles remained after application of exclusion criteria. Seventy-one percent of articles discussed calcineurin inhibitors, such as tacrolimus, 38% included mycophenolate mofetil, and 52% included steroids, such as prednisone. Some studies utilized a combination of immunosuppressants or had multiple study arms. Seventy percent of the articles indicated changes in quantities of anaerobic bacteria including Ruminococcaceae, Lachnospiraceae, Firmicutes, Bacteroides, and Clostridiales. Combinations of immunosuppressant agents were associated with an increase in colonization of Escherichia coli and Enterococcus sp.
CONCLUSION
Some immunosuppressants are associated with changes in gut flora, but the impact on clinical outcomes is unknown. Robust clinical trials delineating the direct effect of immunosuppressants on the gut microbiome as well as the impact on clinical outcomes are warranted.
Topics: Gastrointestinal Microbiome; Humans; Immunosuppressive Agents; Mycophenolic Acid; Organ Transplantation; Tacrolimus
PubMed: 32609940
DOI: 10.1111/tid.13397 -
Medicine Jun 2020Staphylococcus saccharolyticus is a rare cause of human infectious disease. The clinical characteristics and treatment of patients with S saccharolyticus infections...
BACKGROUND
Staphylococcus saccharolyticus is a rare cause of human infectious disease. The clinical characteristics and treatment of patients with S saccharolyticus infections remain largely unknown.
OBJECTIVES
We present the first reported case of empyema due to S saccharolyticus. In addition, a systematic review and pooled analysis of all S saccharolyticus cases were done to summarize the clinical and microbiological characteristics and treatment of this rare pathogen.
METHODS
A case of empyema caused by S saccharolyticus diagnosed in study hospital was reported. This case and those identified from PubMed, EMBASE, and Web of Science were analyzed.
RESULTS
In total, 8 patients were reviewed. The averages of the white blood cell count, sedimentation rate, and C-reactive protein were 16.8 × 10/L, 72 mm/h, and 176 mg/L, respectively. The average time-to-positivity of the anaerobic cultures was 5 days. The S saccharolyticus was resistant to metronidazole, but susceptible to fluoroquinolones, clindamycin, and vancomycin in all the cases with drug sensitivity tests available for these antibiotics. Two of 7 patients showed resistance to all β-lactams. Both of those patients finally died.
CONCLUSIONS
S saccharolyticus should be added to the list of anaerobic microorganisms that are able to cause empyema. A prolonged anaerobic culture is critical to improve the yield of this possibly underestimated pathogen. The time to positive culture of S saccharolyticus may not help to distinguish true-positive growth from contaminated growth. Acute or subacute courses and systemic evidence of infection may contribute to judge the clinical significance of positive cultures and avoid unnecessary antibiotic treatment. β-Lactam agents plus fluoroquinolones or vancomycin/teicoplanin or clindamycin may be appropriate to achieve full coverage of the β-lactam resistant bacteria.
Topics: Anti-Bacterial Agents; Ceftazidime; Drug Therapy, Combination; Empyema; Humans; Male; Middle Aged; Moxifloxacin; Pleural Effusion; Staphylococcal Infections; Staphylococcus; Tomography, X-Ray Computed
PubMed: 32590742
DOI: 10.1097/MD.0000000000020686 -
Prilozi (Makedonska Akademija Na... Jun 2020One of the most important types of microorganisms in the oral cavity in both healthy and non-healthy individuals is Fusobacterium nucleatum. Although present as a normal...
INTRODUCTION
One of the most important types of microorganisms in the oral cavity in both healthy and non-healthy individuals is Fusobacterium nucleatum. Although present as a normal resident in the oral cavity, this Gram-negative pathogen is dominant in periodontal disease and it is involved in many invasive infections in the population, acute and chronic inflammatory conditions, as well as many adverse events with a fatal outcome.
AIM
To determine the role of F. nucleatum in the development of polymicrobial biofilms thus pathogenic changes in and out of the oral media.
MATERIAL AND METHOD
A systematic review of the literature concerning the determination and role of F. nucleatum through available clinical trials, literature reviews, original research and articles published electronically at Pub Med and Google Scholar.
CONCLUSION
The presence of Fusobacterium nucleatum is commonly associated with the health status of individuals. These anaerobic bacteria plays a key role in oral pathological conditions and has been detected in many systemic disorders causing complex pathogenethic changes probably due to binding ability to various cells thus several virulence mechanisms. Most common diseases and conditions in the oral cavity associated with F.nucleatum are gingivitis (G), chronic periodontitis (CH), aggressive periodontitis (AgP), endo-periodental infections (E-P), chronic apical periodontitis (PCHA). The bacterium has been identified and detected in many systemic disorders such as coronary heart disease (CVD) pathological pregnancy (P); polycystic ovary syndrome (PCOS), high-risk pregnancy (HRP), colorectal cancer (CRC); pre-eclampsia (PE); rheumatoid arthritis (RA); osteoarthritis (OA).
Topics: Arthritis, Rheumatoid; Biofilms; Chronic Disease; Colorectal Neoplasms; Coronary Disease; Female; Fusobacterium nucleatum; Gingivitis; Humans; Mouth; Osteoarthritis; Periodontal Diseases; Periodontitis; Polycystic Ovary Syndrome; Pre-Eclampsia; Pregnancy; Pregnancy, High-Risk
PubMed: 32573481
DOI: 10.2478/prilozi-2020-0026 -
Environmental Science and Pollution... Aug 2020Recent research interest has focused on microalgae cultivation for biogas slurry purification and biogas upgrading due to the requirement of high efficiency for nutrient...
Recent research interest has focused on microalgae cultivation for biogas slurry purification and biogas upgrading due to the requirement of high efficiency for nutrient uptake and CO capture, with economic feasibility and environmental benefits. Numerous studies have suggested that biogas slurry purification and biogas upgrading can occur simultaneously via microalgae-based technology. However, there is no comprehensive review on this technology with respect to the nutrient removal from biogas slurry and biogas upgrading. This article summarizes microalgal cultivation with biogas slurry and biogas from anaerobic digestion. The parameters, techniques, and modes of microalgae cultivation have been discussed in detail to achieve high efficiency in biogas slurry purification and biogas upgrading. In addition, the evaluation of energy efficiency and safety has also been explored. Compared with mono-cultivation of microalgae and co-cultivation of microalgae and bacteria, microalgae-fungi symbiosis has demonstrated greater development prospect and higher energy efficiency and the energy consumption for pollutants and CO removal were 14.2-39.0% · USD and 19.9-23.3% · USD, respectively. Further, a sustainable recycling scheme is proposed for the purification of biogas slurry from anaerobic digestion process and biogas upgrading via microalgae-based technology.
Topics: Biofuels; Biomass; Carbon Dioxide; Environmental Pollutants; Microalgae; Nutrients
PubMed: 32468373
DOI: 10.1007/s11356-020-09282-2 -
Journal of Clinical Medicine Mar 2020are anaerobic/aero-tolerant rod Gram-positive bacteria, and numerous studies are associated with primary and secondary endodontic infections. The data in the literature... (Review)
Review
are anaerobic/aero-tolerant rod Gram-positive bacteria, and numerous studies are associated with primary and secondary endodontic infections. The data in the literature on the prevalence of are conflicting, and there are studies that report conflicting data on the prevalence in primary and secondary endodontic infections. This review aims to clarify the prevalence of bacteria of the genus in endodontic lesions. The present systematic review work was performed on the basis of the Prisma protocol. A search was carried out on the PubMed and Scopus databases with the use of keywords. The research produced 410 records, which, after the elimination of the overlaps and the application of the inclusion and exclusion criteria, led to a number of 36 included articles divided by the three outcomes. The first outcome concerns prevalence of bacteria of the genus in primary and secondary endodontic lesions. The secondary outcome, differences in the prevalence of bacteria of the genus Propionibacterium between primary endodontic infections and secondary endodontic infections. The tertiary outcome, differences in the prevalence of compared to in endodontic infections. The results of the meta-analysis show that the genus bacteria are more prevalent in secondary endodontic infections and that has a higher prevalence than .
PubMed: 32182900
DOI: 10.3390/jcm9030739 -
Journal of Clinical Medicine Feb 2020are anaerobic, rod-shaped, Gram-positive bacteria. They are associated with persistent extraradicular endodontic infections, with possible involvement of the soft... (Review)
Review
are anaerobic, rod-shaped, Gram-positive bacteria. They are associated with persistent extraradicular endodontic infections, with possible involvement of the soft tissues of the maxillofacial district. Many studies reported conflicting data on the presence of bacteria of the genus in endodontic infections. The aim of this systematic review of the literature was to determine the real prevalence of such bacteria in primary and/or secondary endodontic infections and in cases of persistence with extraradicular involvement. This systematic review was performed according to the PRISMA protocol. A search was carried out through the Scopus and PubMed databases of potentially eligible articles through the use of appropriate keywords. The literature research resulted in preliminary 2240 records which, after the elimination of overlaps and the application of inclusion and exclusion criteria, led to the inclusion of 46 articles focusing on three outcomes (primary outcome: number of teeth with the presence of a persistent extraradicular infection in which the presence of was ascertained; secondary outcome: number of teeth with endodontic infection in which the presence of was assessed; tertiary outcome: difference in the prevalence of bacteria of the genus between primary endodontic infections and secondary endodontic infections). Results of the meta-analysis show how bacteria of the genus are present in primary and secondary intraradicular infections and in those with persistence with a prevalence (ratio between teeth with and teeth with infection) ranging from 0.091 up to 0.130 depending on the subgroups analyzed.
PubMed: 32046071
DOI: 10.3390/jcm9020457 -
The Journal of Infection Dec 2019Antibiotics change the composition of the intestinal microbiota. The magnitude of the effect of antibiotics on the microbiota and whether the effects are short-term or...
OBJECTIVE
Antibiotics change the composition of the intestinal microbiota. The magnitude of the effect of antibiotics on the microbiota and whether the effects are short-term or persist long-term remain uncertain. In this review, we summarise studies that have investigated the effect of antibiotics on the composition of the human intestinal microbiota.
METHODS
A systematic search was done to identify original studies that have investigated the effect of systemic antibiotics on the intestinal microbiota in humans.
RESULTS
We identified 129 studies investigating 2076 participants and 301 controls. Many studies reported a decrease in bacterial diversity with antibiotic treatment. Penicillin only had minor effects on the intestinal microbiota. Amoxicillin, amoxcillin/clavulanate, cephalosporins, lipopolyglycopeptides, macrolides, ketolides, clindamycin, tigecycline, quinolones and fosfomycin all increased abundance of Enterobacteriaea other than E. coli (mainly Citrobacter spp., Enterobacter spp. and Klebsiella spp.). Amoxcillin, cephalosporins, macrolides, clindamycin, quinolones and sulphonamides decreased abundance of E. coli, while amoxcillin/clavulante, in contrast to other penicillins, increased abundance of E. coli. Amoxicllin, piperacillin and ticarcillin, cephalosporins (except fifth generation cephalosporins), carbapenems and lipoglycopeptides were associated with increased abundance of Enterococcus spp., while macrolides and doxycycline decreased its abundance. Piperacillin and ticarcillin, carbapenems, macrolides, clindamycin and quinolones strongly decreased the abundance of anaerobic bacteria. In the studies that investigated persistence, the longest duration of changes was reported after treatment with ciprofloxacin (one year), clindamycin (two years) and clarithromycin plus metronidazole (four years). Many antibiotics were associated with a decrease in butyrate or butryrate-producing bacteria.
CONCLUSION
Antibiotics have profound and sometimes persisting effects on the intestinal microbiota, characterised by diminished abundance of beneficial commensals and increased abundance of potentially detrimental microorganisms. Understanding these effects will help tailor antibiotic treatment and the use of probiotics to minimise this 'collateral damage'.
Topics: Anti-Bacterial Agents; Gastrointestinal Microbiome; Gram-Negative Bacteria; Gram-Positive Bacteria; Humans; Microbiota
PubMed: 31629863
DOI: 10.1016/j.jinf.2019.10.008 -
Infection Control and Hospital... Jan 2020Cutaneous antisepsis with chlorhexidine or povidone-iodine, usually with alcohol, has been extensively studied. This review of published studies reveals that sequential...
Cutaneous antisepsis with chlorhexidine or povidone-iodine, usually with alcohol, has been extensively studied. This review of published studies reveals that sequential use of povidone-iodine and chlorhexidine leads to a greater reduction in the bioburden of aerobic and anaerobic bacteria on the skin, lower risk of intravascular catheter colonization, and lower risk of surgical site infection compared to use of either agent alone. As such, sequential use of cutaneous antiseptic agents may further reduce risk of surgical site infections, as well as infections associated with insertion of transdermal devices such as nephrostomy tubes, left-ventricular assistance devices, and intravascular catheters.
Topics: Administration, Cutaneous; Alcohols; Anti-Infective Agents, Local; Bacteria, Aerobic; Bacteria, Anaerobic; Bacterial Load; Catheter-Related Infections; Chlorhexidine; Humans; Povidone-Iodine; Skin; Surgical Wound Infection
PubMed: 31619301
DOI: 10.1017/ice.2019.287 -
Medicine Oct 2019Complicated intra-abdominal infections (cIAIs) are common in clinical practice, caused by a mixture of aerobic and anaerobic bacteria, increase the risk of mortality.... (Comparative Study)
Comparative Study Meta-Analysis
BACKGROUND
Complicated intra-abdominal infections (cIAIs) are common in clinical practice, caused by a mixture of aerobic and anaerobic bacteria, increase the risk of mortality. Carbapenems and tigecycline (TGC) are recommended for antimicrobial therapies for cIAIs.
OBJECTIVE
To compare the effectiveness and safety of different carbapenems vs TGC for the treatment of cIAIs.
METHODS
PubMed, Embase, Medline (via Ovid SP) and Cochrane library databases were systematically searched. We included randomized controlled trials (RCTs) comparing different carbapenems vs TGC for the treatment of cIAIs. The pooled odds ratio (OR) with 95% credible interval (CrI) was calculated by Markov chain Monte Carlo methods. We estimated summary ORs using pairwise and network meta-analysis with random effects.
RESULTS
Fifteen studies involving 6745 participants were included in the analysis. Five different carbapenems and TGC were ultimately evaluated in this study. Although, the efficacy of carbapenems and TGC by ORs with corresponding 95% CrIs had not yet reached statistical differences, the cumulative rank probability indicated that clinical treatment success from best to worst was doripenem (DOPM), meropenem (MEPM), imipenem/cilastatin (IC), biapenem (BAPM), TGC and imipenem/cilastatin/relebactam (ICRB); microbiological treatment success from best to worst was DOPM, MEPM, IC, BAPM, ICRB and TGC. As for the risk of adverse events (AEs), TGC showed higher risk of AEs compared with IC (OR = 1.53, 95% CrI = 1.02-2.41), the remain antibiotic agents from lower to higher was MEPM, IC, BAPM, DOPM, ICRB and TGC. The risk of mortality from lower to higher was BAPM, DOPM, MEPM, IC, TGC and ICRB.
CONCLUSION
No differences in clinical and microbiological outcomes were observed between different carbapenems and TGC. Balancing the evidence for drug efficacy and side effects, DOPM appears to be the best available treatment for cIAIs. Therefore, it is reasonable to consider that DOPM is one of the best carbapenem monotherapy for cIAIs. MEPM and IC was also associated with higher rates of clinical and microbiological treatment success following DOPM. Empiric antimicrobial treatment of patients with cIAIs should be selected in light of the local bacterial epidemiology and patterns of resistance.
Topics: Anti-Bacterial Agents; Bayes Theorem; Carbapenems; Humans; Intraabdominal Infections; Network Meta-Analysis; Tigecycline
PubMed: 31577763
DOI: 10.1097/MD.0000000000017436