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.
Flow diagram for recruitment, enrolment and completion of trial. Withdrawals were not related to the study vaccine and all new and medically relevant information that was detected at screening were communicated to the candidate volunteers' General Practitioners with their permission.
