Influenza Vaccine Effectiveness in Young Children
- Here's a breakdown of the key findings from the provided text regarding influenza vaccine efficacy and effectiveness in children:
- * Efficacy (clinical trials): * 1 dose: 51% (95% CI, 39%-60%) against any influenza.
- * Effectiveness (real-world use, vaccine-naive patients): * 1 dose: 35% (95% CI, 18%-48%) in children under 9 years.
Here’s a breakdown of the key findings from the provided text regarding influenza vaccine efficacy and effectiveness in children:
LAIV (Live Attenuated Influenza Vaccine):
* Efficacy (clinical trials):
* 1 dose: 51% (95% CI, 39%-60%) against any influenza.
* 2 doses: 82% (95% CI, 69%-89%) against any influenza.
IIV (Inactivated Influenza vaccine):
* Effectiveness (real-world use, vaccine-naive patients):
* 1 dose: 35% (95% CI, 18%-48%) in children under 9 years.
* 2 doses: 43% (95% CI, 34%-50%) in children under 9 years.
* 1 dose: 14% (95% CI, -9.8% to 33%) in children under 3 years.
* 2 doses: 41% (95% CI, 29%-51%) in children under 3 years.
* effectiveness (partially vs. fully vaccinated):
* Under 9 years: 32% (partially vaccinated) vs. 54% (fully vaccinated).
* Under 3 years: 19% (partially vaccinated) vs. 43% (fully vaccinated).
Key Conclusions:
* Children under 3: benefit from 2 doses of IIV in their frist year of vaccination, providing more protection then 1 dose.
* Children under 9: Do not show a notable benefit from 2 doses of the influenza vaccine overall.
* Data Gaps: The study highlights the need for more research with larger sample sizes to better understand the impact of 2-dose schedules by age and disease severity. There was insufficient data to compare 1- and 2-dose LAIV effectiveness.