eons
a vaccine
vaccine
vaccines
Antigens are important because they trigger responses to pathogens by the immune system. Without them, no prevention against pathogens would take place.
Smoking is a cancer-causing irritant which can trigger viruses. Smoking can cause allergies which can lead to a weakened immune system.
They put in dead or biologically weakened bacteria or virus strains that cauase your immune system to create antibodys against theese otherwise virulent pathogens.
Because our bodies have evolved to defend ourselves from these pathogens. We have an "immune system".
immune
Type your answer here... pathogens
The propose of vaccination is to trigger the immune system and help it recognize a disease organism.
Immunity.
A vaccine usually contains a weakened form of the virus, strong enough to trigger your immune response but weak enough to be defeated by it.