ArticleThe Journal of infectious diseases2025
Prevotella intermedia Synergistically Exacerbates Pneumonia Induced by Oral Streptococci.
Article in The Journal of infectious diseases, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
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Who cites it
5 citing papers in PubMed.
- Article
- Prevotella melaninogenica Alleviate Mycoplasma pneumoniae Infection Through the Butyrate Based on Multi-Omic Analysis and Experimental Validation.Chemical biology & drug design · 2026Article
- Beyond the Lungs: ICU Oral Care and Gut Resilience-A Hypothesis-Generating Narrative Review.Microorganisms · 2026Review
- Solithromycin mitigatesFrontiers in cellular and infection microbiology · 2026Article
- Microbial Coaggregation in the Oral Cavity: Molecular Interactions and Current Insights.International journal of molecular sciences · 2025Review
Corrections and comments
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Authors and funding
18 authors.
Funding
Abstract
backgroundThe precise mechanisms of respiratory infection caused by oral anaerobic bacteria remain elusive. Unexpectedly, bacterial microbiota analysis with 16S rRNA revealed "hidden" mixed infections of anaerobic bacteria and commensal oral Streptococcus species in patients with community-acquired pneumonia. The study aimed to elucidate the mechanisms by which Prevotella intermedia exacerbates oral streptococcal pneumonia.
methodsOral streptococci were oropharyngeally administered with the culture supernatants of P intermedia (PiSup) in mice to assess survival, microbial burden, inflammatory responses, and host response via unbiased bulk RNA sequencing. Additionally, genetically engineered strains of P intermedia were used to identify pathogenic factors.
resultsSeven-week-old female C57BL/6J mice treated with the combination of Streptococcus spp and PiSup exhibited significantly worse survival and increased microbial burden in the lungs and spleen when compared with Streptococcus spp and control medium. RNA sequencing of whole lung revealed disruption of neutrophilic bactericidal activity due to NADPH downregulation, accompanied by reduced myeloperoxidase production in mixed infections, leading to dysfunctional neutrophil accumulation in the lungs. Notably, PiSup from strains bearing mutations in the type IX secretion pathway (ΔporT or ΔporK) failed to worsen the mixed infection.
conclusionsP intermedia exacerbates pneumonia caused by commensal oral streptococci by inducing neutrophilic dysfunction in mixed infection. Products of the type IX secretion system should be investigated as novel targets independent of reported virulence factors.
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Registered trials
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