Question

Passive immunity is provided through

• A. Exogenous supply of antigens
• B. Exogenous supply of antibodies
• C. Endogenous supply of antigens
• D. Endogenous supply of antibodies

Answer 1

The correct option is B Exogenous supply of antibodies

Passive immunity is the transfer of active humoral immunity of ready-made antibodies (exogenous). Passive immunity can occur naturally, when maternal antibodies are transferred to the fetus through the placenta, and it can also be induced artificially when high levels of antibodies specific to a pathogen or toxin are transferred to non-immune persons through blood products that contain antibodies. Passive immunization can be provided when people cannot synthesize antibodies, and when they have been exposed to a disease against which a person is not immunized.

So, the correct answer is 'Exogenous supply of antibodies'.