why vaccination is given to a healthy person
class 8 science chapter 2
Microorganisms friend and foe
Answers
Answer:
Vaccines are one of our most effective health interventions, but are often misunderstood.
We’re protected from infectious disease by our immune system, which destroys disease-causing germs – also known as pathogens – when they invade the body. If our immune system isn’t quick or strong enough to prevent pathogens taking hold, then we get ill.
We use vaccines to stop this from happening. A vaccine provides a controlled exposure to a pathogen, training and strengthening the immune system so it can fight that disease quickly and effectively in future. By imitating an infection, the vaccine protects us against the real thing.
They protect us from dangerous diseases.
In some regions or populations, dangerous diseases are constantly present (endemic). Examples include hepatitis B, cholera and polio. So long as these diseases are around, we need vaccines to bolster our immune systems and protect us from harm.