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Well, I’m not much for Chinese virology ever since Wuhan…. Prefer EU CDC:Review of Influenza Virus Vaccines: The Qualitative Nature of Immune Responses to Infection and Vaccination Is a Critical Consideration - PMC
Factors affecting the immunogenicity of influenza vaccines in human - BMC Infectious Diseases
Background The influenza viruses pose a threat to human health and medical services, and vaccination is an important way to prevent infection. However, the effectiveness of influenza vaccines is affected by various aspects. This study aimed to explore factors related to the immune response to...link.springer.com
Key Facts About Seasonal Flu Vaccine
Vaccination has been shown to reduce the risk of flu illness, hospitalization and flu-related death.www.cdc.gov
Early seasonal influenza vaccine effectiveness estimates were calculated for the period week 41-49 2025, by influenza subtype and age (when data stratifications allowed). It was not possible to estimate vaccine effectiveness separately for individuals aged 65 years and older, due to the low number of influenza cases included in the study.
Across the total population (all age groups), vaccine effectiveness was:
Age-specific vaccine effectiveness estimates for A(H3N2) were 52% (95% CI: 21-72) among those aged 0–17 years and 57% (95% CI: 4-84) among those aged 18–64 years. Due to the dominance of influenza A(H3N2), estimates for other influenza subtypes are imprecise at this time in the season.
- 44% (95% CI: 25–59) against any influenza;
- 52% (95% CI: 29–69) against influenza A(H3N2);
- 16% (95% CI: -43–54) against influenza A(H1N1)pdm09.
https://www.ecdc.europa.eu/en/news...ine-effectiveness-against-influenza-requiring












