Generally speaking, vaccinations are inoculations that attempt to confer immunity against a specific disease. Our anti-body defenses are stimulated when weakened versions of bacteria or viruses are injected into our system.
Bacterial vaccinations are grown in petri dishes but viral vaccinations require a live host. Recent medical advances have widened the sphere of what ”live host” actually means. This require a look into how they are made and to what we are exposing ourselves to.