Active immunity is generated by

Exposure to a live pathogen

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Exposure to a dead pathogen

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By transfer of antibodies from a healthy person

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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.

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Similar questions

Immunity produced by antibodies on exposure to antigens is for short period.

Q. The immune response occurring on the first exposure to a pathogen is called response.

Regarding the assertion and reason, select the right option

(A) Vaccination exploits the fact that the immune system’s response to a second exposure to pathogens is much faster and more vigorous than it is the first time around.

(R) Vaccines mimic live pathogens.

Q. If a person is infected with deadly pathogen/toxin against which quick immune response is required, ready-made antibodies are directly given to protect that person based on the principle of passive immunity. Select the option that does not represent a case of passive immunity.

Active immunity is elicited by exposure to
i. Toxoids
ii. Subclinical infection
iii. Antitoxins
iv. Immunoglobulins
v. Antigen exposure

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