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Background: Severe community-acquired pneumonia was associated with high morbidity and mortality in children. However, species-level microbiome of lower airway was sparse, and we used shotgun metagenomic next-generation sequencing to explore microbial signatures.

Methods: We conducted a prospective cohort study to recruit children under 18 who required admission to an intensive care unit for community-acquired pneumonia between December 2019 and February 2022.

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We report the case of a 77-year-old Japanese woman with neuromyelitis optica spectrum disorder, treated with 15 mg of prednisolone daily, who presented with acute septic shock and altered consciousness due to Dolosigranulum pigrum bacteremia. Intravenous extracellular fluids and broad-spectrum antibiotics were administered as an initial treatment. However, the patient died shortly after admission.

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Background: Bacterial pathogens such as Staphylococcus aureus colonize body surfaces of part of the human population, which represents a critical risk factor for skin disorders and invasive infections. However, such pathogens do not belong to the human core microbiomes. Beneficial commensal bacteria can often prevent the invasion and persistence of such pathogens by using molecular strategies that are only superficially understood.

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Article Synopsis
  • Nasal colonization by certain bacteria increases infection risk, while others are linked to health; this study used human nasal epithelial organoids (HNOs) to explore these dynamics.
  • HNOs were successfully colonized with three bacterial species for up to 48 hours, showing minimal harm and allowing for the bacteria to localize in the mucus.
  • The research identified specific immune responses to the bacterial species, indicating that some bacteria trigger inflammation while others modulate immune signaling without causing infection.
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Although gastroesophageal reflux has been recognized as one of the risk factors of nontuberculous mycobacterial pulmonary disease (NTM-PD) progression, the effect of reflux on the lower respiratory tract microbiota has not been studied in detail. We investigated the composition of the lower respiratory tract microbiota in patients with clinically suspected NTM-PD, comparing them based on the presence of reflux. Forty-seven patients suspected of having NTM-PD were enrolled and assigned according to presence of reflux (n = 22) and non- reflux (n = 25).

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