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Non-typeable Haemophilus influenzae, an under-recognised pathogen.

Johan Van Eldere1, Mary P E Slack2, Shamez Ladhani3

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Non-typeable Haemophilus influenzae (NTHi) causes significant mucosal and invasive infections, particularly in vulnerable populations. The rise of ampicillin-resistant NTHi strains necessitates updated treatment guidelines and enhanced surveillance.

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Area of Science:

  • Medical Microbiology
  • Infectious Diseases
  • Antimicrobial Resistance

Background:

  • Non-typeable Haemophilus influenzae (NTHi) is a primary pathogen responsible for mucosal infections like otitis media, sinusitis, and conjunctivitis.
  • NTHi also contributes to exacerbations of chronic obstructive pulmonary disease and lower respiratory tract infections.
  • There has been a documented global increase in invasive NTHi infections over the last two decades, posing risks to infants, children, and the elderly.

Purpose of the Study:

  • To highlight the increasing global incidence of invasive NTHi infections.
  • To address the growing concern of antimicrobial resistance, particularly the emergence of beta-lactamase-negative ampicillin-resistant strains.
  • To advocate for improved surveillance and research into NTHi pathobiology.

Main Methods:

  • Review of epidemiological trends in NTHi infections.
  • Analysis of antimicrobial resistance mechanisms, focusing on beta-lactamase production and emerging resistance patterns.
  • Assessment of at-risk populations and associated mortality.

Main Results:

  • NTHi is a significant cause of various mucosal and invasive infections, with increasing incidence worldwide.
  • Individuals with comorbidities, perinatal infants, young children, and the elderly are most susceptible to severe NTHi infections.
  • Beta-lactamase production is common, but beta-lactamase-negative ampicillin-resistant NTHi strains are a growing global concern.

Conclusions:

  • The rise of resistant NTHi strains may require revisions to antibiotic treatment guidelines for respiratory infections.
  • Enhanced, standardized surveillance and typing methodologies are crucial for monitoring NTHi.
  • Increased international focus on NTHi pathobiology and clinical impact is warranted.