Related Experiment Videos
Chronologic localization of mycoplasma hyopneumoniae in experimentally infected pigs
Abstract:
The chronologic localization of Mycoplasma hyopneumoniae was examined by in situ hybridization in experimentally infected pigs for a period of 35 days after intratracheal inoculation. M. hyopneumoniae DNA was detected in bronchial and bronchiolar epithelial cells from infected pigs at 7, 14, 21, and 28 days postinoculation (DPI) and in alveolar and interstitial macrophages and type I pneumocytes from infected pigs at 14, 21, 28, and 35 DPI. Strong hybridization signals for M. hyopneumoniae were detected mainly at the luminal surface of bronchial and bronchiolar lining epithelial cells. When a hybridization signal was detected at the luminal surface of bronchial and bronchiolar lining epithelial cells, a given bronchus or bronchiole also exhibited peribronchiolar lymphoid cuffing. These observations suggested that the presence of M. hyopneumoniae in different tissues could be due to a difference in the duration of the infection.
Insights
This study tracked Mycoplasma hyopneumoniae in pigs for 35 days. The bacteria were found in lung tissues, with location varying by infection duration.
Area of Science:
- Veterinary Pathology
- Microbiology
- Animal Science
Background:
- Mycoplasma hyopneumoniae is a significant respiratory pathogen in swine.
- Understanding its tissue distribution is crucial for disease control.
Purpose of the Study:
- To chronologically map the localization of Mycoplasma hyopneumoniae in the pig respiratory tract.
- To correlate bacterial presence with host inflammatory responses.
Main Methods:
- Experimental infection of pigs with Mycoplasma hyopneumoniae via intratracheal inoculation.
- In situ hybridization technique used to detect bacterial DNA in lung tissues.
- Histopathological examination for inflammatory markers like lymphoid cuffing.
Main Results:
- Mycoplasma hyopneumoniae DNA detected in bronchial and bronchiolar epithelial cells from 7 to 28 days postinoculation (DPI).
- Bacterial DNA also found in alveolar macrophages, interstitial macrophages, and type I pneumocytes from 14 to 35 DPI.
- Strong hybridization signals observed on the luminal surface of bronchial/bronchiolar epithelial cells, often associated with peribronchiolar lymphoid cuffing.
Conclusions:
- The location of Mycoplasma hyopneumoniae in pig lungs changes over the course of infection.
- Bacterial presence in different cell types and locations may indicate varying infection durations.
- Findings suggest a dynamic interaction between Mycoplasma hyopneumoniae and the host respiratory system.