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Question

Active immunity is generated by



A

Exposure to a live pathogen

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B

Exposure to a dead pathogen

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C

By transfer of antibodies from a healthy person

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D

Both A and C

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Solution

The correct options are
A

Exposure to a live pathogen


B

Exposure to a dead pathogen


Active immunity could be developed in the body on being exposed to a live pathogen. Here the pathogen establishes an infection, which is then subdued in time and immunity is built due to the formation of memory cells. Exposure to a dead pathogen as in the case of vaccines, wherein dead and weakened pathogens are administered, also induces active immunity.


Biology

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