Here is an article from November, 2008. The Goverment has already started with experimenting with the RFID concept. This is real and it is coming unless you wake up and put a stop to it.
Boston launches flu shot tracking
City to pinpoint areas of low rates of vaccination
By Stephen Smith
Globe Staff / November 21, 2008
Using technology originally developed for mass disasters, Boston disease trackers are embarking on a novel experiment - one of the first in the country - aimed at eventually creating a citywide registry of everyone who has had a flu vaccination. The resulting vaccination map would allow swift intervention in neighborhoods left vulnerable to the fast-moving respiratory illness.
The trial starts this afternoon, when several hundred people are expected to queue up for immunizations at the headquarters of the Boston Public Health Commission. Each of them will get a bracelet printed with a unique identifier code. Information about the vaccine's recipients, and the shot, will be entered into handheld devices similar to those used by delivery truck drivers.