factually
Index/Topics/Influenza VE Studies

Influenza VE Studies

Studies on the effectiveness of influenza vaccines

Fact-Checks

2 results
Jan 11, 2026

How does flu vaccine effectiveness compare to natural immunity across different age groups?

Seasonal influenza vaccines provide moderate, variable protection that is generally higher in children than in adults and lower in older adults, while immunity from natural infection tends to be more ...

Jan 9, 2026

What methodological biases should be examined in vaccinated vs. unvaccinated observational studies?

Observational comparisons of vaccinated and unvaccinated populations are fertile ground for misleading conclusions unless a range of methodological biases are actively sought and addressed; the litera...