The rationale for quadrivalent influenza vaccines

Area of Science:

• Virology
• Immunology
• Vaccinology

Background:

• Two distinct influenza B virus lineages have circulated globally since 1985.
• Current trivalent influenza vaccines contain only one lineage, leading to limited cross-lineage protection.
• Predicting the dominant influenza B lineage for seasonal vaccines has historically been unreliable.

Purpose of the Study:

• To evaluate the potential improvement of seasonal influenza vaccines by including both influenza B lineages.
• To assess the feasibility and impact of quadrivalent influenza vaccines on global influenza epidemiology.
• To review the current status of quadrivalent influenza vaccine development and clinical evaluation.

Main Methods:

• Review of historical influenza B lineage circulation and vaccine composition.
• Analysis of the limitations of trivalent vaccines in providing broad influenza B protection.
• Assessment of manufacturing capacity and strain selection methods for quadrivalent vaccines.
• Monitoring of ongoing clinical studies for quadrivalent influenza vaccines.

Main Results:

• Trivalent vaccines offer incomplete immunity due to the co-circulation of two distinct influenza B lineages.
• Quadrivalent vaccines, containing both lineages, are being developed to enhance vaccine effectiveness.
• Manufacturing capacity and strain selection methods are adequate for quadrivalent vaccine production.

Conclusions:

• Quadrivalent influenza vaccines represent a significant improvement over trivalent vaccines for seasonal influenza prevention.
• Further data from clinical trials and epidemiological studies are needed to establish the full safety and effectiveness of quadrivalent vaccines.
• The adoption of quadrivalent vaccines could lead to more effective influenza vaccination campaigns globally.