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Detection of Mycoplasma hyorhinis in porcine eustachitis
T Morita1, Y Muraki, T Awakura
1Department of Veterinary Pathology, Faculty of Agriculture, Tottori University, Japan.
Abstract:
Pathologic study of the ear was performed on 179 young swine, ranging in age from 1 day to 18.6 weeks. Histologically, eustachitis was the most common and its inflammatory reaction appeared to precede otitis. Immunohistochemically, Mycoplasma hyorhinis (Mhr) antigens were detected on the luminal surface of the auditory epithelia in 19 of 179 cases (10.6%). All the cases, positive for Mhr antigens, were associated with an acute eustachitis. Ultrastructural examination of two piglets confirmed these immunohistochemical data. The present results indicate that Mhr may be a primary cause of acute eustachitis in young swine.
Insights
Mycoplasma hyorhinis (Mhr) may cause acute eustachitis in young swine. This study found Mhr antigens linked to inflammation in the auditory epithelia, suggesting Mhr as a primary pathogen in swine eustachitis.
Area of Science:
- Veterinary Pathology
- Swine Diseases
- Microbiology
Background:
- Eustachitis is a common condition in young swine.
- The etiology of eustachitis and its relationship with otitis require further investigation.
Purpose of the Study:
- To investigate the pathological and etiological basis of eustachitis in young swine.
- To determine the role of Mycoplasma hyorhinis (Mhr) in the pathogenesis of eustachitis.
Main Methods:
- Histopathological examination of 179 young swine ears.
- Immunohistochemical detection of Mhr antigens in auditory epithelia.
- Ultrastructural analysis of affected tissues.
Main Results:
- Eustachitis was the most frequent finding, often preceding otitis.
- Mhr antigens were detected in 10.6% of cases, exclusively in those with acute eustachitis.
- Ultrastructural findings corroborated the immunohistochemical results.
Conclusions:
- Mycoplasma hyorhinis is identified as a potential primary causative agent of acute eustachitis in young swine.
- The findings highlight the importance of Mhr in swine ear pathology.