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Related Experiment Videos

A pathologic and bacteriologic study on otitis media in swine.

A Shimada1, T Adachi, T Umemura

  • 1Department of Veterinary Pathology, Tottori University, Koyama, Japan.

Veterinary Pathology
|July 1, 1992
PubMed
Summary

Otitis media is common in swine, affecting nearly 70% of pigs studied. This common swine ear infection often involves the middle ear and auditory tube, with severity increasing with age.

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Area of Science:

  • Veterinary Pathology
  • Swine Health
  • Otolaryngology

Background:

  • Otitis media is a prevalent condition in swine, often presenting with subclinical manifestations.
  • Understanding the pathology and prevalence of otitis in swine is crucial for herd health management.

Purpose of the Study:

  • To conduct a pathologic and bacteriologic study of otitis in swine.
  • To determine the incidence and characteristics of otitis media, otitis externa, and otitis interna in a swine population.
  • To investigate the age-related progression and severity of otitis media.

Main Methods:

  • Post-mortem examination of 237 swine (1 day to 1 year old) from eight farms.
  • Macroscopic and microscopic evaluation of ear lesions, including middle, external, and internal ear structures.

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  • Age-specific analysis of otitis incidence and pathology.

    • Main Results:

    • Otitis affected 68.8% of swine, with 63.7% having middle ear involvement (otitis media).
    • Otitis media was frequently bilateral (75.5%) and always associated with auditory tube inflammation.
    • Lesions progressed with age, with severe otitis media and tympanic bulla bone lysis observed in younger pigs (1-4 months).

    Conclusions:

    • Otitis media is a significant pathologic finding in swine, often subclinical.
    • The auditory tube plays a critical role in the pathogenesis of otitis media in swine.
    • Age is a key factor influencing the severity and progression of otitis media in pigs.