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Updated: Jun 9, 2026

A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii

A Robust Pneumonia Model in Immunocompetent Rodents to Evaluate Antibacterial Efficacy against S. pneumoniae, H. influenzae, K. pneumoniae, P. aeruginosa or A. baumannii

Published on: January 2, 2017

A rat model for pneumococcal otitis media.

A Hermansson¹, P Emgård, K Prellner

¹Department of Oto-Rhino-Laryngology, University Hospital, Lund, Sweden.

American Journal of Otolaryngology

|May 1, 1988

Summary

This summary is machine-generated.

This study demonstrates that rats are a suitable animal model for bacterial otitis media research. Different pneumococci strains and concentrations induced varying middle ear effusion responses in rats.

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Area of Science:

Microbiology
Otolaryngology
Animal Models

Background:

Bacterial otitis media is a common infection.
Developing reliable animal models is crucial for understanding disease pathogenesis and testing treatments.

Purpose of the Study:

To evaluate the Sprague-Dawley rat as an animal model for bacterial otitis media.
To investigate the effects of different pneumococci strains and concentrations on the middle ear.

Main Methods:

Male Sprague-Dawley rats were inoculated in the middle ear with Streptococcus pneumoniae (types 3 or 6A).
Otomicroscopy and bacterial analysis of middle ear effusions, blood, and nasopharyngeal samples were performed.
Animal responses and recovery were monitored.

Main Results:

Inoculation led to three distinct outcomes: otitis media with purulent effusion, otitis media with serous effusion, or no observable reaction.
The observed responses varied based on pneumococci type and concentration.
Low mortality rates and full recovery without lasting damage were noted.

Conclusions:

The Sprague-Dawley rat serves as a viable and responsive animal model for studying bacterial otitis media.
This model allows for the investigation of different pathogen types and their effects on middle ear infections.