Matt Taibbi points out the CDC’s quiet change to its definition of “vaccine”:

In December 2021, the Centers for Disease Control made a change to its definition of “vaccine.” The old one read, “A product that stimulates a person’s immune system to produce immunity to a specific disease, protecting the person from that disease.” The new definition removed “immunity,” reading, “A preparation that is used to stimulate the body’s immune response against diseases.”

The change was made just ahead of the widespread administration of a Covid vaccine that did not produce immunity: