Publications by authors named "Takahiro Takazono"

is an emerging pathogenic fungus that is highly resistant to existing antifungal drugs. Manogepix is a novel antifungal agent that exerts antifungal activity by inhibiting glycosylphosphatidylinositol anchor biosynthesis. Although the mechanisms of resistance of species to manogepix have been reported previously, those of are yet to be studied.

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Background: The factors contributing to the development of severe coronavirus disease 2019 (COVID-19) following infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) remain unclear. Although the presence of immune complexes (ICs), formed between antibodies and their antigens, has been linked to COVID-19 severity, their role requires further investigation, and the antigens within these ICs are yet to be characterized.

Method: Here, a C1q enzyme-liked immunosorbent assay and immune complexome analysis were used to determine IC concentrations and characterize IC antigens, respectively, in the sera of 64 unvaccinated COVID-19 patients with PCR-confirmed SARS-CoV-2 infection, enrolled at seven participating centers in 2020.

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  • Fungi are classified into four Risk Groups based on their potential to harm humans, with Risk Group 3 indicating significant dangers, including fatalities.
  • This review highlights dangerous fungi like Blastomyces dermatitidis and Cladophialophora bantiana, which are known for severe health impacts and high mortality rates due to laboratory-acquired infections.
  • Strict biosafety measures are essential in labs handling these fungi due to their associated risks and documented cases of infections and deaths.
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Exophiala dermatitidis is an emerging black fungus that causes pulmonary infections that may be underestimated by conventional culture methods. We encountered one case that initially appeared to be yeast and was misidentified as Rhodotorula spp. using a commercial identification kit.

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  • A 63-year-old man with relapsed acute myeloid leukemia underwent a third stem cell transplant and was given voriconazole to prevent fungal infections.
  • On day 42 post-transplant, he developed septic arthritis without the typical skin signs associated with fungal infections.
  • Despite surgery and treatment with liposomal amphotericin B, he died due to a resistant fungal infection, highlighting the need to consider azole-resistant infections as potential causes of septic arthritis in similar patients.
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Background: Azithromycin has favorable effects on critical respiratory diseases owing to its antimicrobial and anti-inflammatory properties. During the early stages of the coronavirus disease 2019 (COVID-19) pandemic, azithromycin was frequently administered before specific treatments were developed. However, the efficacy of this treatment has not been verified.

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  • - The study investigates how periodontal pathogens cause severe inflammation by examining the role of neutrophils and the potential treatment effects of macrolides like clarithromycin on this inflammation.
  • - Researchers tested clarithromycin on human airway epithelial cells exposed to pathogen supernatants, finding it reduced the production of the inflammatory marker IL-8 by interfering with specific signaling pathways.
  • - Results suggest that the extracellular signal-regulated kinases (ERK) are activated by pathogen exposure and that clarithromycin pretreatment can inhibit this activation, pointing to its therapeutic potential for managing inflammation caused by periodontal pathogens in lung tissues.
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Non-tuberculous mycobacterial pulmonary disease (NTM-PD) is a refractory chronic respiratory infectious disease and its prevalence is increasing globally. The standard treatment regimen for NTM-PD involves long-term multidrug therapy including macrolides. The incidence of adverse events is high given the advanced age of many NTM-PD patients.

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Introduction: The diagnostic tools of nucleic acid amplification tests and antigen tests have been extensively employed for the detection of Coronavirus disease 2019 (COVID-19). Although the reverse-transcriptase polymerase chain reaction (RT)-PCR test has high sensitivity and specificity, it is a time-consuming and labor-intensive process. On the other hand, antigen tests are simple and prompt, however, their low sensitivity and potential for false positives have been identified as limitations.

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This retrospective cohort study analyzed data from a Japanese health insurance database to assess the effectiveness of baloxavir (n = 4822) for preventing severe events compared with oseltamivir (n = 10,523) in patients with influenza B. The primary endpoint was hospitalization incidence (Days 2-14). The secondary endpoints included intravenous antibacterial drug use, pneumonia hospitalization, heart failure hospitalization, inhalational oxygen requirement, and use of other anti-influenza drugs.

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Introduction: This case report presents the successful detection of an exon 19 deletion using virtual bronchoscopic navigation (VBN) and endobronchial ultrasound with guide sheath (EBUS-GS) brushing, integrated with highly sensitive next-generation sequencing (NGS), even in challenging biopsy scenarios. The growing prevalence of driver gene alterations in non-small cell lung cancer necessitates effective bronchoscopic technology and reliable multiplex gene NGS panels. However, data regarding the optimal bronchoscopic techniques when using highly sensitive NGS panels are limited.

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  • Functional decline often occurs during the start of hemodialysis, especially when it’s unplanned, prompting researchers to investigate factors surrounding its initiation and patient outcomes in Japan.
  • A study involving 257 patients revealed that unplanned hemodialysis is linked to conditions like heart failure and infections, leading to poorer health outcomes compared to planned dialysis starts.
  • To enhance patient care, the findings suggest that improving hygiene and managing heart failure could minimize unplanned dialysis occurrences and enhance overall patient health.
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Introduction: This study aimed to evaluate the effectiveness of ensitrelvir, an oral antiviral, in reducing hospitalization risk in outpatients at high-risk for severe COVID-19 during the Omicron era.

Methods: This was a retrospective study using a large Japanese health insurance claims database. It included high-risk outpatients for severe symptoms who received their first COVID-19 diagnosis between November 2022 and July 2023.

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  • Chronic pulmonary aspergillosis (CPA) is a serious lung infection that can lead to high mortality rates, with 1-year rates between 7% to 32% and 5-year rates between 38% to 52%.
  • Key aspects for managing CPA include understanding the fungus itself, risk factors like pulmonary cavitation, and diagnostic methods such as CT scans and IgG antibodies.
  • Treatment options consist of surgery, hemoptysis management, and antifungal drugs, with a focus on long treatment durations and the potential challenges posed by drug resistance and various CPA subtypes.
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  • Cryobiopsy is expected to be increasingly used for diagnosing lung diseases, but traditional methods pose challenges during tracheal intubation with endotracheal tubes.
  • A new method was developed, using a softer endotracheal tube with an externally attached suction tube for safer and simpler Fogarty catheter insertion.
  • The study found that this novel approach resulted in shorter bronchoscopy times without significantly increasing complications, demonstrating its practicality compared to conventional methods.
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  • - A middle-aged Japanese man with no known immunocompromised conditions developed a severe infection (fungemia) after undergoing surgery for ileal diverticulitis, caused by a newly recognized ascomycetous yeast pathogen.
  • - Initial treatment with micafungin was ineffective, prompting a switch to a combination of liposomal amphotericin B and caspofungin, which ultimately cleared the infection.
  • - Despite the presence of septic emboli in the lungs and spleen, the patient showed no signs of heart infection after extensive testing, and he remained symptom-free after receiving prolonged antifungal therapy.
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Background And Objective: The identification of factors associated with long-term prognosis after community-onset pneumonia in elderly patients should be considered when initiating advance care planning (ACP). We aimed to identify these factors and develop a prediction score model.

Methods: Patients aged 65 years and older, who were hospitalized for pneumonia at nine collaborating institutions, were included.

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Purpose: Despite the importance of abscess lesions in clinical decisions regarding anaerobic bacteremia (AB), their impact on clinical characteristics remains unclear. Herein, we aimed to elucidate the clinical factors associated with AB that were unaccompanied by detectable abscess lesions during the initial phase of infection.

Methods: This was a multicenter retrospective observational study involving patients with culture-proven AB at six tertiary hospitals in Japan between January 2012 and March 2022.

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Background: No comprehensive analysis of the pulmonary sequelae of coronavirus disease 2019 (COVID-19) in Japan based on respiratory function tests and chest computed tomography (CT) has been reported. We evaluated post-COVID-19 conditions, especially focusing on pulmonary sequelae assessed by pulmonary function tests and chest CT.

Methods: For this prospective cohort study, we enrolled 1069 patients who presented pneumonia at the time of admission in 55 hospitals from February 2020 to September 2021.

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  • Invasive aspergillosis (IA) and mucormycosis are severe infections predominantly affecting immunocompromised individuals, and drug-resistant strains present a significant clinical challenge.* -
  • This research explores the potential of Vγ9Vδ2 T cells, a unique subset of T cells, in fighting these infections, showing strong antifungal properties against resistant strains by direct interaction with fungal hyphae.* -
  • The study highlights the promising role of Vγ9Vδ2 T cells as a new therapy for treating IA and mucormycosis, which could offer an effective alternative to traditional antifungal treatments that often have harmful side effects.*
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  • * Out of 672 patients analyzed, only 9 (1.3%) developed complicated NTM infections, leading to a higher mortality rate in those patients compared to others.
  • * The findings suggest that while NTM complications are rare among those on biologics, they can be severe, especially in patients taking higher doses of corticosteroids, necessitating vigilant monitoring even in the absence of positive MAC antibody tests.
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Cryptococcosis is a major worldwide disseminated invasive fungal infection. Cryptococcosis, particularly in its most lethal manifestation of cryptococcal meningitis, accounts for substantial mortality and morbidity. The breadth of the clinical cryptococcosis syndromes, the different patient types at-risk and affected, and the vastly disparate resource settings where clinicians practice pose a complex array of challenges.

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Background: Nursing- and healthcare-associated pneumonia (NHCAP) constitutes most of the pneumonia in elderly patients including aspiration pneumonia in Japan. Lascufloxacin (LSFX) possesses broad antibacterial activity against respiratory pathogens, such as Streptococcus spp. And anaerobes inside the oral cavity.

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