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Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture01:26

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Methodology for Sputum Induction and Laboratory Processing
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Bacteria and sputum inflammatory cell counts; a COPD cohort analysis.

Augusta S Beech1,2, Simon Lea3, Umme Kolsum3

  • 1Division of Infection, Immunity and Respiratory Medicine, School of Biological Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK. gbeech@meu.org.uk.

Respiratory Research
|November 2, 2020
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Summary

Persistent Haemophilus influenzae (H. influenzae) colonization in chronic obstructive pulmonary disease (COPD) patients is linked to heightened airway and systemic neutrophilic inflammation. This specific bacterial presence correlates with increased neutrophils and a lower neutrophil-lymphocyte ratio (NLR).

Keywords:
COPDEosinophilHaemophilus influenzaeMicrobiomeSputum

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Area of Science:

  • Pulmonary Medicine
  • Microbiology
  • Immunology

Background:

  • Bacterial colonization in Chronic Obstructive Pulmonary Disease (COPD) is associated with increased neutrophilic airway inflammation.
  • This study investigated whether distinct bacterial phyla and species elicit varied inflammatory profiles in COPD patients.

Purpose of the Study:

  • To test the hypothesis that different bacterial species in COPD patients induce different inflammatory responses.
  • To identify specific bacterial culprits associated with distinct inflammatory profiles in COPD.

Main Methods:

  • Sputum samples were analyzed using quantitative polymerase chain reaction (qPCR) for bacterial load and 16S rRNA gene sequencing for taxonomic composition.
  • Differential cell counts (DCC) of sputum and blood were performed at baseline and 6 months.
  • Patients were grouped based on bacterial load, absence of potentially pathogenic microorganisms (PPM), or colonization by specific bacteria like Haemophilus influenzae (H. influenzae), Moraxella catarrhalis (M. catarrhalis), or Streptococcus pneumoniae (S. pneumoniae).

Main Results:

  • COPD patients colonized with H. influenzae exhibited significantly higher sputum neutrophils, blood neutrophils, and neutrophil-lymphocyte ratio (NLR) compared to those without PPM colonization.
  • These inflammatory markers remained elevated at both baseline and 6-month follow-up.
  • A positive correlation was observed between H. influenzae bacterial load and sputum neutrophil percentage over time.

Conclusions:

  • A distinct subgroup of COPD patients experiences persistent H. influenzae colonization.
  • This persistent colonization is significantly associated with increased airway and systemic neutrophilic inflammation.
  • The findings suggest H. influenzae drives a specific neutrophilic inflammatory phenotype in COPD, potentially with less eosinophilic involvement.