Increasing herd immunity with influenza revaccination

Area of Science:

• Epidemiology
• Public Health
• Mathematical Modeling

Background:

• Seasonal influenza poses a global public health challenge.
• Influenza vaccines are crucial for reducing illness and death.
• Debate exists regarding the benefits of repeated seasonal vaccinations.

Purpose of the Study:

• To model the impact of continuous seasonal influenza vaccination.
• To assess how vaccination continuity affects public health burden.
• To evaluate the role of revaccination in protecting highly connected individuals.

Main Methods:

• Developed a two-season influenza epidemic contact network model.
• Simulated influenza transmission dynamics.
• Analyzed results on empirical contact networks with assortativity.

Main Results:

• Increasing vaccination continuity across seasons reduces overall public health burden.
• Revaccination lowers the influenza attack rate by reducing susceptible individuals.
• Consistent vaccination disproportionately protects highly connected individuals, curbing transmission.

Conclusions:

• Continuous seasonal influenza vaccination is beneficial for public health.
• Public health policy should consider individual vaccination histories.
• Consistent vaccination strategies enhance influenza control and reduce disease impact.