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[Interfering and interferonogenic activity of attenuated and original para-influenza viral strains]
Abstract:
A higher interfering activity of attenuated (vaccine) strains of parainfluenza virus types 1, 2 and 3 which had undergone a long-term adaptation to cell cultures as compared to the original viruses was established. The interferon-inducing activity of vaccine parainfluenza virus types 2 and 3 was also higher than that of the original viruses. The high interfering and interferon-inducing activity of attenuated parainfluenza virus strains of type 2 and 3 correlated with reduced virulence of these variants for man. These tests may be used for the assessment of virulence of parainfluenza virus strains type 2 and 3 in the laboratory.
Insights
Attenuated parainfluenza virus vaccine strains exhibit enhanced interfering and interferon-inducing activities compared to original strains. This heightened activity in parainfluenza virus types 2 and 3 correlates with reduced human virulence, suggesting a potential laboratory assessment method.
Area of Science:
- Virology
- Immunology
- Vaccine Development
Background:
- Parainfluenza viruses are significant respiratory pathogens.
- Attenuated virus strains are developed for vaccine purposes.
- Understanding the properties of attenuated strains is crucial for vaccine efficacy and safety.
Purpose of the Study:
- To compare the interfering and interferon-inducing activities of attenuated parainfluenza virus strains with their original counterparts.
- To investigate the correlation between these activities and the virulence of attenuated strains.
- To evaluate the potential of these assays for assessing parainfluenza virus strain virulence.
Main Methods:
- Long-term adaptation of parainfluenza virus types 1, 2, and 3 to cell cultures to generate attenuated strains.
- Assay of interfering activity of original and attenuated virus strains.
- Assay of interferon-inducing activity of original and attenuated virus strains.
- Correlation analysis between interfering/interferon-inducing activity and human virulence data.
Main Results:
- Attenuated parainfluenza virus strains (types 1, 2, and 3) showed higher interfering activity than original strains.
- Attenuated parainfluenza virus types 2 and 3 demonstrated higher interferon-inducing activity compared to original strains.
- Increased interfering and interferon-inducing activity in attenuated parainfluenza virus types 2 and 3 correlated with reduced virulence in humans.
Conclusions:
- Long-term cell culture adaptation enhances the interfering and interferon-inducing properties of parainfluenza virus vaccine strains.
- These enhanced activities in attenuated parainfluenza virus types 2 and 3 are linked to decreased virulence.
- Interfering and interferon-inducing activity assays can serve as laboratory tools for assessing the virulence of parainfluenza virus types 2 and 3 strains.