Effect of respiratory syncytial virus on adherence, colonization and immunity of non-typable Haemophilus influenzae: implications for otitis media

Janak Patel, H. Faden, Sanjay Sharma, P. L. Ogra

Research output: Contribution to journalArticle

63 Scopus citations


Adherence of non-typable Haemophilus influenzae to respiratory epithelium was evaluated in a cotton rat model of respiratory syncytial virus (RSV) infection. Colonization with non-typable H. influenzae increased to a maximum within 4 days of RSV infection compared to RSV negative controls (4.58 ± 0.17 vs 3.82 ± 0.23 log colony forming units (CFU) per ml, P < 0.05) and then declined over the subsequent 10 days (2.0 ± 0 vs 3.78 + 0.39 CFU per ml, P < 0.0001). In a second series of experiments, attachment of non-typable H. influenzae to epithelial cells collected from RSV infected cotton rats at the time of maximum virus replication was not different from controls (57.4 ± 18.3 vs 52.0 ± 24.3 bacteria per 50 cells). Systemic immunity to non-typable H. influenzae as measured by IgG-specific antibody to the outer membrane complex and bactericidal antibody did not influence colonization. These data suggest that colonization with non-typable H. influenzae is significantly affected by a concurrent infection with RSV; however, the site of bacterial attachment is not known.

Original languageEnglish (US)
Pages (from-to)15-23
Number of pages9
JournalInternational Journal of Pediatric Otorhinolaryngology
Issue number1
StatePublished - 1992
Externally publishedYes



  • Bacterial adherence
  • Nasopharyngeal colonization
  • Non-typable Haemophilus influenzae
  • Otitis media
  • Respiratory syncytial virus

ASJC Scopus subject areas

  • Otorhinolaryngology
  • Pediatrics, Perinatology, and Child Health
  • Pulmonary and Respiratory Medicine
  • Surgery

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