Vaccine dream meaning is explained below using 2 different sources. Each interpretation is shown with its source.

Interpretation 1 — Dr. Mıchael Lennox

A vaccine protects from certain diseases by introducing a small and manageable amount of the infectious agent into the system, creating an immune response that is ultimately protective. In this way, the sensibility being expressed by a vaccine connects to moving toward something in order to build up an ability to tolerate it. In a dream, this symbol suggests that your fears would be best conquered by facing them a little at a time.
Source: Complete Dictionary of Dreams Author: Dr. Mıchael Lennox

Interpretation 2 — Nancy Wagaman

Guarding or strengthening yourself against attack or intrusion.

Protection or insurance.

Preparing for the future.

Preemptive action to avoid a problem later.

A feeling or fear of attack somewhere in your life.

See Injection

Source: The Curious Dreamer’s Dream Dictionary Author: Nancy Wagaman