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Haemophilus influenzae: recent advances in the understanding of molecular pathogenesis and polymicrobial infections

Farshid Jalalvand1, Kristian Riesbeck

  • 1Medical Microbiology, Department of Laboratory Medicine Malmö, Lund University, Malmö, Sweden.

Current Opinion in Infectious Diseases
|April 5, 2014
PubMed
Abstract

Insights

Non-typeable Haemophilus influenzae (NTHi) uses sophisticated strategies to colonize the human respiratory tract, evade immunity, and survive in harsh conditions. Further research is essential to fully understand NTHi pathogenesis and host-pathogen interactions.

Area of Science:

  • Microbiology
  • Pathogenesis
  • Bacterial Infections

Background:

  • Non-typeable Haemophilus influenzae (NTHi) is a significant human-specific mucosal pathogen.
  • NTHi is a common cause of infections in children and patients with chronic obstructive pulmonary disease (COPD).
  • NTHi frequently participates in polymicrobial superinfections, complicating treatment and understanding.

Purpose of the Study:

  • To review recent advances in understanding the molecular mechanisms of NTHi pathogenesis.
  • To highlight the strategies NTHi employs for colonization, survival, and interaction with hosts and other microbes.
  • To identify areas requiring further investigation in NTHi research.

Main Methods:

  • Utilizing experimental human colonization models to study NTHi behavior.
  • Employing whole-genome approaches to identify virulence factors and compare strains.
  • Analyzing molecular mechanisms of NTHi adaptation and interaction.

Main Results:

  • NTHi employs diverse strategies including mucociliary elevator escape, immune evasion, and nutrient scavenging.
  • Lipooligosaccharide branching, adhesins, metabolic adaptation, and scavenging systems are key to NTHi virulence.
  • Genome-based studies reveal numerous hypothetical proteins as potential virulence determinants, indicating much remains unknown.

Conclusions:

  • NTHi is an opportunistic pathogen specialized in colonizing the human respiratory tract.
  • Intricate mechanisms enable NTHi's growth and survival within the human host.
  • Further research is crucial to elucidate NTHi host-pathogen and pathogen-pathogen interactions.

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