Vaccination strategies against influenza

Area of Science:

• Virology and Immunology
• Vaccinology

Background:

• Influenza virus infections lead to considerable global morbidity and mortality annually.
• Antigenic drift and shift in influenza viruses necessitate continuous vaccine updates and pose pandemic threats.
• Existing seasonal influenza vaccines include live attenuated and inactivated trivalent formulations, with ongoing research into improved efficacy.

Purpose of the Study:

• To review and discuss various vaccination strategies for maximizing protection against seasonal and pandemic influenza.
• To provide perspective on current influenza vaccination approaches in light of the H1N1v pandemic threat.

Main Methods:

• Literature review and discussion of existing and investigational influenza vaccine strategies.
• Analysis of vaccination approaches for seasonal and pandemic influenza, considering efficacy enhancement methods.

Main Results:

• Seasonal influenza vaccines are widely used, with strategies like adjuvants, increased antigen content, and alternative delivery routes being investigated for improved efficacy in vulnerable populations.
• Licensed approaches exist for pandemic influenza viruses, addressing the challenges posed by major antigenic changes.
• The review encompasses different vaccination strategies to maximize protection against both seasonal and pandemic influenza.

Conclusions:

• Understanding influenza virus evolution, including antigenic drift and shift, is crucial for effective vaccine development.
• A range of vaccination strategies are available and under investigation to combat seasonal and pandemic influenza threats.
• The H1N1v pandemic highlights the ongoing need for robust and adaptable influenza immunization programs.