Figure 4.
Forest plot of vaccine effectiveness against all influenza by covariate adjustment. Abbreviations: CI, confidence interval; VE, vaccine effectiveness.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.