Figure 1.
Potential stage in the evolution of an immunisation programme, vaccine safety. Diagram adapted from Chen et al. The Vaccine Adverse Effect Reporting System (VAERS). Vaccine 1994:12(6):542–50.
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.