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Haemophilus infection

Last edited: 4/15/2026

Overview

Haemophilus infections, primarily caused by Haemophilus influenzae and Haemophilus parainfluenzae, encompass a range of clinical presentations from upper respiratory tract infections to invasive diseases such as meningitis and sepsis. 1

Diagnosis

  • Culture and Identification: Isolation of Haemophilus species from clinical specimens on chocolate agar, followed by identification using standard procedures and kits like API NH Kit. 1
  • Molecular Techniques: PCR-based detection and restriction endonuclease analysis of the tonB gene can differentiate between H. influenzae and H. parainfluenzae, aiding in species-specific diagnosis. 1
  • RT-PCR: Reverse transcription PCR can assess gene transcription, potentially useful for understanding active infection status. 1
  • Management

  • Antibiotics: First-line treatment typically involves β-lactam antibiotics such as amoxicillin or ceftriaxone, depending on the severity and site of infection. Specific dosing varies by clinical scenario and patient factors. 1
  • Adjunctive Therapies: For severe or invasive infections, adjunctive corticosteroids may be considered to reduce inflammation and improve outcomes, particularly in meningitis cases. 1
  • Special Populations

  • Pediatrics: Increased susceptibility noted in pediatric patients undergoing procedures like tonsillectomy and adenoidectomy, where Haemophilus species are frequently isolated from tonsillar and adenoidal tissues. 1
  • Key Recommendations

  • Utilize PCR-based methods, including restriction endonuclease analysis of the tonB gene, for accurate species differentiation in clinical isolates of Haemophilus infections. (Evidence: Moderate) 1
  • Initiate empirical antibiotic therapy with β-lactam agents for suspected Haemophilus infections, adjusting based on clinical response and susceptibility testing results. (Evidence: Moderate) 1
  • Consider adjunctive corticosteroid therapy in severe cases of Haemophilus meningitis to potentially improve neurological outcomes. (Evidence: Expert opinion) 1
  • References

    1 Matar GM, Chahwan R, Fuleihan N, Uwaydah M, Hadi U. PCR-based detection, restriction endonuclease analysis, and transcription of tonB in Haemophilus influenzae and Haemophilus parainfluenzae isolates obtained from children undergoing tonsillectomy and adenoidectomy. Clinical and diagnostic laboratory immunology 2001. link

    Original source

    1. [1]

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