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[A morphological study of pneumopathies caused by associated para-influenza and influenza viruses]
M Petica1, A Petrescu, P Athanasiu
1Institut de Virologie Stefan S. Nicolau, Bucarest, Roumanie.
Abstract:
Histological examination of lungs collected from mice inoculated with influenza A/PR 8/34 (H0N0) and/or parainfluenza type 3 viruses revealed the existence of lymphohistiocytic interstitial bronchopneumonia lesions. Necrosis zones were found in the lungs of influenza virus infected animals. Associated infection by the two viruses induced also the fibroblast and fibrocyte proliferation, at same average ratios.
Insights
Influenza and parainfluenza virus infections in mice caused lung inflammation and necrosis. Combined infections also led to fibroblast and fibrocyte proliferation in lung tissues.
Area of Science:
- Veterinary Pathology
- Virology
- Immunology
Background:
- Influenza and parainfluenza viruses are significant respiratory pathogens.
- Understanding viral interactions in the respiratory tract is crucial for disease management.
Purpose of the Study:
- To investigate the histological lung changes induced by influenza A/PR 8/34 (H0N0) and parainfluenza type 3 viruses, individually and in combination.
- To characterize the inflammatory and proliferative responses in mouse lungs following viral inoculation.
Main Methods:
- Histological examination of lung tissues from mice inoculated with influenza A/PR 8/34 (H0N0) and/or parainfluenza type 3 viruses.
- Microscopic analysis to identify and quantify pathological lesions, including inflammation, necrosis, and cellular proliferation.
Main Results:
- Both influenza A/PR 8/34 (H0N0) and parainfluenza type 3 viruses induced lymphohistiocytic interstitial bronchopneumonia lesions.
- Necrosis zones were observed in the lungs of mice infected with influenza virus alone.
- Co-infection with both viruses resulted in fibroblast and fibrocyte proliferation at comparable ratios.
Conclusions:
- Influenza and parainfluenza type 3 viruses cause distinct yet overlapping pathological changes in mouse lungs.
- Combined viral infections can lead to significant interstitial pneumonia and cellular proliferation.
- Further research is warranted to explore the synergistic or additive effects of these viral co-infections on respiratory health.