Question

Active immunity may be gained by
1.natural infection
2. vaccines
(ü) toxoids
(iv) All of the above​

Answer 1

Answer:

Active immunity may be gained by 2. vaccines

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Answer 2

The answer is 2 Vaccine

Extra point :

active immunity can be induced by a vaccine, a substance that contains antigen. A vaccine stimulates a primary response against the antigen without causing symptoms of the disease.

Immune is the balanced state of multicellular organisms having adequate biological defenses to fight infection, disease, or other unwanted biological invasion, while having adequate tolerance to avoid allergy, and autoimmune diseases.

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