Publications by authors named "Ying-chun Xu"

Article Synopsis
  • The study presents the first detailed genome analysis of a rare human yeast pathogen called Candida mucifera, identified in a patient suffering from chronic ear infections.
  • Researchers found that this pathogen shows lower effectiveness to azole antifungals, which are commonly used to treat fungal infections.
  • The findings suggest that Candida mucifera has similarities in drug resistance to its related species in the Trichomonascus ciferrii complex.
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  • The study aimed to determine the epidemiology cut-off (ECOFF) values for eravacycline against various bacterial species, including E. coli and S. aureus, through a multi-centre research effort in China.
  • Researchers analyzed 2500 bacterial samples from hospitals in China and measured the minimum inhibitory concentrations (MICs) of eravacycline, adhering to EUCAST guidelines.
  • The findings showed specific ECOFF values for each species, indicating effective thresholds for classification, and suggest that eravacycline could be a viable treatment option for complicated intra-abdominal infections caused by these pathogens.
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Unlabelled: This study aimed to assess the efficacy of ceftazidime-avibactam (CZA) in combination with various antimicrobial agents against carbapenem-resistant (CRKP). We selected 59 clinical CRKP isolates containing distinct drug resistance mechanisms. The minimum inhibitory concentrations (MICs) of meropenem (MEM), colistin (COL), eravacycline (ERA), amikacin (AK), fosfomycin (FOS), and aztreonam (ATM), both individually and in combination with CZA, were tested using the checkerboard method.

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  • Candida auris is a multidrug-resistant fungal pathogen causing outbreaks in China, and its resistance mechanisms are not fully understood, especially in strains developed in live hosts.
  • The study analyzed 16 strains from two patients using whole-genome sequencing, revealing all belonged to the South Asian lineage with distinct mutations linked to antifungal resistance, particularly in the ERG11 and TAC1b genes.
  • The findings indicate a potential transmission of C. auris and highlight the need for further research into the genetic mutations and resistance mechanisms to improve monitoring and treatment strategies.
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Background: Nocardia farcinica is one of the most common Nocardia species causing human infections. It is an opportunistic pathogen that often infects people with compromised immune systems. It could invade human body through respiratory tract or skin wounds, cause local infection, and affect other organs via hematogenous dissemination.

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Invasive diseases caused by the globally distributed commensal yeast Candida tropicalis are associated with mortality rates of greater than 50%. Notable increases of azole resistance have been observed in this species, particularly within Asia-Pacific regions. Here, we carried out a genetic population study on 1571 global C.

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Inadequate T cell activation has severely limited the success of T cell engager (TCE) therapy, especially in solid tumors. Enhancing T cell activity while maintaining the tumor specificity of TCEs is the key to improving their clinical efficacy. However, currently, there needs to be more effective strategies in clinical practice.

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  • This study investigates the characteristics and azole resistance mechanisms of Candida parapsilosis isolates in China.
  • Out of 2318 isolates tested, 2.4% were resistant to fluconazole, especially prevalent among ICU patients, highlighting significant genetic clustering and transmission.
  • Key mutations were identified, including Erg11Y132F, which contributes to resistance, along with others that play a role in increasing resistance levels and cross-resistance to different azoles.
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Objective: To investigate the distribution and antimicrobial susceptibility of causative microorganisms recovered from patients with intra-abdominal infections (IAIs).

Methods: A total of 2,926 bacterial and fungal strains were identified in samples collected from 1,679 patients with IAIs at the Peking Union Medical College Hospital between 2011 and 2021. Pathogenic bacteria and fungi were identified using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry.

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Article Synopsis
  • * A new method called Coulter counter-based antimicrobial susceptibility testing (CAST) was developed, allowing for fast analysis of bacterial growth after just 2 hours of exposure to antibiotics.
  • * Testing showed that CAST performed effectively, with results matching traditional methods 90.18% of the time, making it a promising tool for clinical use.
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  • Targeting single tumor antigens can lead to toxicity and treatment failure, especially in solid tumors, prompting a need for improved selectivity in T cell engagers (TCEs).
  • The research introduced trispecific T cell engagers (TriTCEs) that enhance tumor selectivity by simultaneously targeting two tumor antigens, leading to a significant increase in T cell activation and tumor cell killing compared to traditional single antigen approaches.
  • In vivo studies showed that TriTCEs effectively accumulate in tumor tissues and facilitate T cell infiltration, resulting in better tumor growth inhibition and extended survival in mice, highlighting their potential for safer and more effective cancer treatment.
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Ceftolozane/tazobactam (an antipseudomonal cephalosporin) in combination with a well-established β-lactamase inhibitor has not been approved to date in clinical practice in China. The aim of this study was to evaluate the in-vitro activity of ceftolozane/tazobactam and comparator agents against Pseudomonas aeruginosa with various resistance patterns. P.

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  • Candida albicans is the leading cause of invasive candidiasis, and a study examined the genetic structure of 551 strains globally, testing antifungal susceptibilities of 370 of them.
  • Among the resistant strains, 66.6% were part of Clade 1, and further analysis identified two nested subclades, Clade 1-R and Clade 1-R-α, with high rates of azole resistance (75.0% and 100% respectively).
  • The findings highlight an alarming trend of antifungal resistance linked to specific genetic lineages, emphasizing the need for ongoing monitoring of these resistant strains' spread in clinical settings.
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  • Type II complex is linked to both invasive and non-invasive infections in humans, with 11 strains identified from samples collected in China using advanced laboratory techniques.
  • Whole genome sequencing was performed to analyze genotypes, revealing high minimum inhibitory concentrations (MICs) to amphotericin B and one isolate showing extreme resistance to 5-flucytosine.
  • These findings suggest that the strains primarily pose a risk to patients with weakened immune systems, and the resistance to key antifungal treatments could complicate clinical management.
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What Is This Summary About?: Molds are types of fungus that can cause sickness and death. Mold infections are increasing in China. Until 2022, medicines that can effectively treat all mold infections were still lacking in China.

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Article Synopsis
  • A rare fungal variant has been linked to human infections, necessitating accurate identification through DNA sequencing techniques, specifically targeting the rDNA internal transcribed spacer (ITS) region.
  • This study involved collecting two strains from a Chinese hospital to compare the identification capabilities of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and VITEK 2 YST ID biochemical methods against conventional ITS sequencing.
  • Results showed that both strains were misidentified at the species level by the MS methods and exhibited significant drug resistance, highlighting the emergence of drug-resistant fungal species in China that pose a risk for invasive diseases.
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Objective: To investigate the baseline levels of microorganisms' growth on the hands of anesthesiologists and in the anesthesia environment at a cancer hospital.

Methods: This study performed in nine operating rooms and among 25 anesthesiologists at a cancer hospital. Sampling of the hands of anesthesiologists and the anesthesia environment was performed at a ready-to-use operating room before patient contact began and after decontamination.

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The use of morphology to diagnose invasive mould infections in China still faces substantial challenges, which often leads to delayed diagnosis or misdiagnosis. We developed a model called XMVision Fungus AI to identify mould infections by training, testing, and evaluating a ResNet-50 model. Our research achieved the rapid identification of nine common clinical moulds: complex, complex, complex, complex, , , , spp.

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A Gram-negative, non-motile rod and strictly aerobic bacterium, designated as 18B16333, was isolated from vertebral puncture tissue of a patient at Peking union medical college hospital in China. Growth occurred in NaCl concentrations of 0-1% (w/v) (optimum growth at 0% NaCl), at temperatures of 25-40 °C (optimum growth at 37 °C) and at pH 6.0-9.

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Objective: The purpose of this study was to help to promote a better understanding of the male fertility preservation status in China.

Methods: In this cross-sectional survey, 1,912 healthcare providers and oncologists were surveyed anonymously using 16 questions carried out at community oncology practices in China from September 2018 to April 2021. 16 questions were designed to evaluate their knowledge on male fertility preservation in cancer patients, assess the factors they considered when deciding whether to discuss male fertility preservation with their patients.

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Recently, the prevalence of macrolide-resistant has been reported, especially among Chinese children. The fitness cost of resistance is reported to render the resistant bacteria less virulent. To investigate the correlation between macrolide susceptibility of and pathogenicity, the whole genome of 70 isolates belonging to four clonal complexes with different macrolide susceptibilities was sequenced.

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This study aimed to assess the diagnostic values of peptidoglycan (PGN), lipopolysaccharide (LPS) and (1,3)-Beta-D-Glucan (BDG) in patients with suspected bloodstream infection. We collected 493 heparin anticoagulant samples from patients undergoing blood culture in Peking Union Medical College Hospital from November 2020 to March 2021. The PGN, LPS, and BDG in the plasma were detected using an automatic enzyme labeling analyzer, GLP-F300.

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Serological testing (immunoassay) for Helicobacter pylori (H. pylori) is widely available and inexpensive, and does not require medication modifications before testing. It can also determine the type of infection, which helps with clinical diagnosis and treatment, and guides the use of medication.

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Purpose: Monitoring antifungal susceptibility patterns for new or established antifungals is imperative. Antifungal resistance is frequent in molds, frequently leading to invasive mold infections (IMIs) in immunocompromised patients with high morbidity and mortality. Limited availability of effective antifungals for treatment of IMIs in China is an enormous challenge.

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