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Effects of gaseous ammonia on Mycoplasma pulmonis infection in mice and rats
Abstract:
Effects of gaseous ammonia on Mycoplasma pulmonis infection in mice and rats were investigated with special reference to growth of the organism in the respiratory organs and formation of pneumonic lesions. Multiplication of the organism was enhanced in both mice and rats exposed to 50 and 100 ppm ammonia, but the growth enhancement of the organism was not evident in the animals exposed to 20 ppm ammonia. The enhanced multiplication of the organism was especially remarkable in the lung of mice, showing a difference of about 10(4) organisms/g lung tissue between the exposed and unexposed mice. However, no formation of pneumonic lesions was observed in exposed and unexposed groups of both species of animals.
Insights
Gaseous ammonia exposure, particularly at 50 and 100 ppm, significantly enhanced Mycoplasma pulmonis growth in mouse and rat respiratory organs. However, this enhanced bacterial growth did not lead to the formation of pneumonic lesions in either species.
Area of Science:
- Veterinary Microbiology
- Environmental Toxicology
- Respiratory Pathology
Background:
- Mycoplasma pulmonis is a common respiratory pathogen in rodents.
- Gaseous ammonia is an environmental contaminant often found in animal housing.
- The interaction between ammonia exposure and respiratory infections requires further elucidation.
Purpose of the Study:
- To investigate the effects of gaseous ammonia on Mycoplasma pulmonis infection in mice and rats.
- To assess the impact of ammonia on organism growth in respiratory organs.
- To determine if ammonia exposure influences the formation of pneumonic lesions.
Main Methods:
- Mice and rats were exposed to varying concentrations of gaseous ammonia (20, 50, and 100 ppm).
- Mycoplasma pulmonis was inoculated into the animals.
- Bacterial load in respiratory organs and the presence of pneumonic lesions were evaluated.
Main Results:
- Ammonia exposure at 50 and 100 ppm significantly enhanced Mycoplasma pulmonis multiplication in both mice and rats.
- Enhanced growth was most pronounced in the lungs of mice, with approximately a 10^4 organisms/g lung tissue difference.
- No pneumonic lesions were observed in any of the exposed or unexposed groups.
Conclusions:
- Gaseous ammonia at moderate to high concentrations can promote the growth of Mycoplasma pulmonis in rodent respiratory tracts.
- Despite enhanced bacterial proliferation, ammonia exposure did not induce pneumonic lesion formation in this study.
- These findings highlight a complex interaction between ammonia, microbial load, and host response in respiratory infections.