RESUMEN
Activated sludge (AS) plays a vital role in removing organic pollutants and nutrients from wastewater. However, the risks posed by horizontal gene transfer (HGT) between bacteria in AS are still unclear. Here, a total of 478 high-quality non-redundant metagenome-assembled genomes (MAGs) were obtained. >50 % and 5 % of MAGs were involved in at least one HGT and recent HGT, respectively. Most of the transfers (82.4 %) of antimicrobial resistance genes (ARGs) occurred among the classes of Alphaproteobacteria and Gammaproteobacteria. The bacteria involved in the transfers of virulence factor genes (VFGs) mainly include Alphaproteobacteria (42.3 %), Bacteroidia (19.2 %), and Gammaproteobacteria (11.5 %). Moreover, the number of ARGs and VFGs in the classes of Alphaproteobacteria and Gammaproteobacteria was higher than that in other bacteria (P < 0.001). Mobile genetic elements were important contributors to ARGs and VFGs in AS bacteria. These results have implications for the management of antimicrobial resistance and virulence in activated sludge microorganisms.
Asunto(s)
Antibacterianos , Aguas del Alcantarillado , Aguas del Alcantarillado/microbiología , Virulencia/genética , Antibacterianos/farmacología , Genes Bacterianos , Transferencia de Gen Horizontal , Farmacorresistencia Bacteriana/genética , Bacterias/genética , Factores de Virulencia/genéticaRESUMEN
Staphylococcus aureus inhabits diverse habitats including food waste and wastewater treatment plants. Cases of S. aureus-induced infection are commonly reported worldwide. The emergence of antimicrobial resistance (AMR) of S. aureus is a growing public health threat worldwide. Here, we longitudinally monitored global trends in antibiotic resistance genes (ARGs) of 586 S. aureus strains, isolated between 1884 and 2022. The ARGs in S. aureus exhibited a significant increase over time (P < 0.0001). Mobile genetic elements play a crucial role in the transfer of ARGs in S. aureus strains. The structural equation model results revealed a significant correlation between the human development index and rising antibiotic consumption, which subsequently leads to an indirect escalation of AMR in S. aureus strains. Lastly, a machine learning algorithm successfully predicted the AMR risk of global terrestrial S. aureus with over 70% accuracy. Overall, these findings provided valuable insights for managing AMR in S. aureus.
Asunto(s)
Eliminación de Residuos , Infecciones Estafilocócicas , Humanos , Staphylococcus aureus , Antibacterianos/farmacología , Alimentos , Farmacorresistencia BacterianaRESUMEN
Vibrio parahaemolyticus is a common pathogen, and has emerged with multiple antimicrobial resistance (AMR). However, few studies have conducted large-scale investigations of AMR and virulence trends of V. parahaemolyticus worldwide. This study longitudinally monitored antibiotic resistance genes (ARGs) and virulence factor genes (VFGs) trends of 1540 V. parahaemolyticus isolates isolated from 1951 to 2021. The number of ARGs in V. parahaemolyticus isolates distinctly increased over the years (P = 5.9e-10), while the number of VFGs decreased significantly (P < 2.2e-16). However, the number of VFGs of isolates isolated from humans has not changed significantly over the years (R = 0.013, P = 0.74), suggesting that the pathogenic risk to humans has not been reduced. Besides, mobile genetic elements are important contributors to ARGs in V. parahaemolyticus (R = 0.34, P < 2.2e-16), but have no promoting effect on VFGs (P = 0.50). The structural equation model illustrated that the human development index promoted the consumption of antibiotics, thereby indirectly promoting an increase in the AMR of the V. parahaemolyticus isolates. Finally, the random forest was performed to predict the ARG and VFG risks of global terrestrial V. parahaemolyticus isolates, and successfully map these threats with over 80% accuracy. This study aimed to evaluate the global risks posed by AMR and virulence, which helps to develop methods specifically targeting V. parahaemolyticus to mitigate these threats.
Asunto(s)
Antiinfecciosos , Vibrio parahaemolyticus , Humanos , Antibacterianos/farmacología , Vibrio parahaemolyticus/genética , Farmacorresistencia Bacteriana/genética , Bosques AleatoriosRESUMEN
Shigella flexneri infection is the main cause of diarrhea in humans worldwide. The emergence of antimicrobial resistance (AMR) of S. flexneri is a growing public health threat worldwide, while large-scale studies monitoring the longitudinal AMR trends of isolates remain scarce. Here, the AMR gene (ARG) profiles of 717 S. flexneri isolates from 1920 to 2020 worldwide were determined. The results showed that the average number of ARGs in isolates has increased significantly, from 19.2 ± 2.4 before 1970 to 29.6 ± 5.3 after 2010. In addition, mobile genetic elements were important contributors to ARGs in S. flexneri isolates. The results of the structural equation model showed that the human development index drove the consumption of antibiotics and indirectly promoted the antibiotic resistance. Finally, a machine learning algorithm was used to predict the antibiotic resistance risk of global terrestrial S. flexneri isolates and successfully map the antibiotic resistance threats in global land habitats with over 80% accuracy. Collectively, this study monitored the longitudinal AMR trends, quantitatively surveilled the health risk of S. flexneri AMR, and provided a theoretical basis for mitigating the threat of antibiotic resistance.
Asunto(s)
Antibacterianos , Disentería Bacilar , Humanos , Antibacterianos/farmacología , Shigella flexneri/genética , Farmacorresistencia Bacteriana/genética , Pruebas de Sensibilidad Microbiana , Disentería Bacilar/epidemiología , Disentería Bacilar/tratamiento farmacológicoRESUMEN
OBJECTIVE: To conduct a retrospective analysis of diagnosis and treatment of lumbar disc herniation by discography and percutaneous transforaminal endoscopic surgery. METHODS: From December 2009 to June 2010, 119 patients with lumbar disc herniation underwent discography and transforaminal endoscopic surgery under local anesthesia. There were 75 males and 44 females with a mean age of 44.8 years (range: 15 - 55). The mean disease course was 9 months (range: 3 - 72). The major symptoms were back pain and/or unilateral sciatica. The mean follow-up period was 26 months. All underwent lumbar radiography, computed tomography (CT) and magnetic resonance imaging (MRI) revealing 112 single level and 7 two-level disc herniations. There were 82 lateral and 37 para-medial disc herniations. Eight-nine patients had protruded discs while 30 had prolapsed and sequestered discs. There were no obvious lumbar stenosis, spondylolisthesis, fracture, infection or tumor cases. The preoperative and postoperative visual analogue scale (VAS) were used to evaluate the sciatica and/or back pain. The outcomes were evaluated by Oswestry disability index (ODI) and the Macnab score. Precise orientation and operation was performed under the guidance of pre-operative imaging, intra-operative fluoroscopy or CT and endoscopic exploration. RESULTS: Among them, 117 cases had the surgery performed successfully. The mean operative duration was 85 min (range: 35 - 85) and the mean blood loss 13 ml (range: 1 - 50). One patient had L5 nerve root injury complicated with paraesthesia and weakness of the affected lower extremity and was relieved gradually after conservative treatment for over 3 months. Another one complicated with postoperative intradiscal infection was referred to another institution and lost follow-up thereafter. Five cases had no improvement at 6 months after the first surgery and were re-operated endoscopically. No one had a conversion into open surgery. They were followed up for a mean period of 26.1 months (range: 25 - 27). Five patients lost follow-up. VAS improved statistically significantly from preoperative 6.8 to postoperative 1.8 (P < 0.05). ODI decreased from preoperative 70.06 to 19.09 at the last follow-up. The Macnab results were excellent (n = 82, 68.9%), good (n = 20, 16.7%), fair (n = 8, 6.7%) and bad (n = 9, 7.7%) (including all patients lost to follow-up). And the excellent-to-good rate was 85.6%. CONCLUSION: With fewer complications and a low recurrence rate, percutaneous transforaminal endoscopic surgery is safe and efficacious in the treatment of lumbar disc herniation.