Ideas or feelings received from someone else— depending upon how you feel in the dream, what has been received can aid in meeting negative influences in life; influence of other people in your life; may be similar to injection and suggest sexual intercourse. See injection. ... A Guide to Dreams and Sleep Experiences
Vision: Dreaming about being vaccinated: people are dishonest and trying to make life difficult tor you—defend yourself! Watching a child being vaccinated: you are protecting a defenseless person from being attacked (with a sharp, “piercing tongue”).
Depth Psychology: The dream is a sign that you want to immunize yourself against other people’s hostilities, nastiness, and malice. These people are not important—don’t take them seriously. Besides, everyone is entitled to his own brand of meanness!... Dreamers Dictionary
Material aspects: In normal everyday life, vaccination is an action that initially hurts but is ultimately for our benefit.
To dream that we are being vaccinated therefore suggests we are likely to be hurt by someone (perhaps emotionally), though ultimately it will be for our own good. Consult the entries for injection and needle for further clarification.... Dream Meanings of Versatile