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Comparison of techniques for primary isolation of respiratory Mycoplasma pulmonis from rats
Abstract:
Studies were performed to determine the optimal sites for primary isolation of Mycoplasma pulmonis from the respiratory system of laboratory rats. In a preliminary study, a group of 42 rats was cultured for respiratory M. pulmonis at several sites. Tracheal washes yielded the highest number of positive cultures (61.9%) and ground lung tissue yielded the lowest (19.0%), with the nasopharyngeal culture in the middle (52.38%). In a subsequent study, the tracheal wash was again the optimal method since 76.7% of 103 rats were positive for M. pulmonis, whereas culture of the nasopharyngeal area resulted in 53.9% positive cultures. In a third study, all 45 rats were positive for M. pulmonis when the tracheal wash method was used, whereas only 51% were positive when the nasopharyngeal area was cultured, indicating that the tracheal wash was the most reliable of the commonly used procedures. Other aspects of these experiments demonstrated the tympanic cavity of animals with otitis media to be an excellent source for obtaining material to culture for M. pulmonis.
Insights
For optimal Mycoplasma pulmonis isolation in rats, tracheal washes are the most reliable method. Nasopharyngeal cultures are less effective, but tympanic cavities can also yield positive results.
Area of Science:
- Veterinary Microbiology
- Rodent Health
Background:
- Mycoplasma pulmonis is a common respiratory pathogen in laboratory rats.
- Accurate isolation methods are crucial for disease diagnosis and control.
Purpose of the Study:
- To identify the optimal anatomical sites for primary isolation of Mycoplasma pulmonis from rats.
- To compare the efficacy of different sampling methods for Mycoplasma pulmonis detection.
Main Methods:
- Culturing respiratory samples from laboratory rats at various sites, including tracheal washes, nasopharyngeal swabs, and ground lung tissue.
- Evaluating the percentage of positive cultures for Mycoplasma pulmonis from each site.
Main Results:
- Tracheal washes yielded the highest percentage of positive Mycoplasma pulmonis cultures across multiple studies (ranging from 61.9% to 100%).
- Nasopharyngeal cultures showed lower positive rates (51-53.9%), and ground lung tissue yielded the lowest (19.0%).
- The tympanic cavity was identified as a potential source for isolation in rats with otitis media.
Conclusions:
- Tracheal washes are the most reliable method for the primary isolation of Mycoplasma pulmonis in laboratory rats.
- Nasopharyngeal culturing is less sensitive than tracheal washes for detecting Mycoplasma pulmonis.
- Sampling the tympanic cavity can be effective in specific cases, such as otitis media.