THE ANTIGENIC POTENCY OF EPIDEMIC INFLUENZA VIRUS FOLLOWING INACTIVATION BY ULTRAVIOLET RADIATION

Area of Science:

• Virology
• Immunology
• Vaccine Development

Background:

• Influenza virus inactivation is crucial for vaccine production.
• Understanding the impact of inactivation methods on viral antigenicity is essential.

Purpose of the Study:

• To assess the antigenic potency of influenza virus inactivated by ultraviolet (UV) radiation.
• To compare the immunizing efficacy of UV-inactivated virus with active virus.
• To investigate factors affecting the rate of UV inactivation.

Main Methods:

• Influenza virus was inactivated using ultraviolet radiation.
• Immunization studies were conducted in mice via intraperitoneal injection.
• Quantitative comparisons of induced immunity were performed using different viral dilutions.
• Inactivation rates were compared between virus in lung suspensions and tissue culture medium.

Main Results:

• UV-inactivated influenza virus retains immunizing capacity in mice.
• High concentrations of inactivated virus showed comparable effectiveness to active virus.
• A hundredfold reduction in immunizing capacity was observed during UV inactivation.
• Virus in lung suspensions inactivated more rapidly than virus in tissue culture medium.

Conclusions:

• UV inactivation is a viable method for producing influenza virus immunizing agents, albeit with reduced potency.
• A standardized method for comparing epidemic influenza virus vaccines is proposed based on these findings.
• The rate of UV inactivation is influenced by the virus's suspending medium.