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Vaccinations

Vaccinations

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Updated: Dec 2, 2025

Influenza A Virus Studies in a Mouse Model of Infection

Influenza A Virus Studies in a Mouse Model of Infection

Published on: September 7, 2017

Projecting influenza vaccine effectiveness: A simulation study.

Thomas N Vilches¹, Affan Shoukat², Claudia Pio Ferreira³

¹Institute of Mathematics, Statistics and Scientific Computing, University of Campinas, Campinas, SP, Brazil.

|November 3, 2020

Summary

This summary is machine-generated.

Influenza vaccine effectiveness (VE) declines due to strain mutations and waning immunity. Early vaccination is key to reducing illness, especially in high-risk groups, despite potential VE reductions.

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Area of Science:

Epidemiology
Immunology
Computational Biology

Background:

Influenza vaccine effectiveness (VE) varies seasonally, influenced by viral strain mutations and diminishing immunity post-vaccination.
Understanding the interplay between antigenic drift and waning immunity is crucial for accurate VE assessment.

Purpose of the Study:

To quantify the relative impact of strain mutations and intraseason waning immunity on influenza VE.
To project VE and estimate illness reduction across different vaccine efficacies and epidemic scenarios.

Main Methods:

Developed a stochastic, age-structured agent-based simulation model for influenza transmission.
Incorporated intraseason waning of immunity and mutation-induced antigenic distance between circulating and vaccine strains.
Parameterized the model with published data to project temporal and overall VE.

Main Results:

Both temporal and overall VE decreased with increasing attack rates.
Lower VE was observed with greater antigenic distance between circulating and vaccine strains.
Intraseason waning of immunity led to a more rapid decline in VE and lower overall effectiveness compared to antigenic distance alone.

Conclusions:

Vaccination remains vital for reducing influenza burden, even with moderate VE, particularly for high-risk individuals.
Optimal vaccination timing should consider both strain evolution and the rate of immunity waning within a season.
Early vaccination is a critical strategy for mitigating healthcare utilization and economic impact of seasonal influenza.