What is the difference between Natural Immunity and Acquired Immunity?

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The difference between Natural Immunity and Acquired Immunity are as follows:

Natural Immunity

(i) Blood

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In our blood there are white blood corpuscles. They oppose microorganisms and form anti toxins in the body. They have the capacity to fight germs. When germs of any disease enter our body these WBCs put up a fight. If they are strong we are safe but if the germs are stronger then we catch the disease.

(ii) Mother’s milk

Mother’s milk is a gift of God to the child. After delivery there is a yellowish thick secretion from mother’s breast. It is called colostrums. It is a protein substance with the protective quality. It pro­vides immunity to babies.

It has been seen that babies who did not get their mother’s milk in the early days of their life were more susceptible to infections. Another important thing is that the milk goes directly in the baby’s body from mother’s body. There is no contact with air. So no chances of contamina­tion are there.

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(iii) Skin

Skin also provides protection as it covers our internal organs and doesn’t allow germs to enter our body.

(iv) Nasal hair

Hair present in the nose blocks the germs from the air to enter our body.

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(v) Epithelial layer. Our whole body is covered with epithelial layer which protects us from the germs as it has mucus cells.

Acquired Immunity

This is achieved in two ways:

(i) By inoculation

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(ii) By falling ill once

(i) By inoculation

Dead germs of a disease are injected in the patient’s body. The body immediately produces antibodies. The antibodies provide immunity for that disease. Immunity for typhoid, diphtheria, TB, and measles is achieved with this way.

(ii) By falling ill once

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If a person con­tracts a disease, then antibodies of that par­ticular disease are produced in the body, so chances of getting the same disease again are very low, e.g., chickenpox.

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