Which is an example of passive immunity?

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Study for the Success! In Clinical Laboratory Science – Immunology Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

Which is an example of passive immunity?

Explanation:
Passive immunity is protection conferred by preformed antibodies received from another person, not produced by the recipient’s own immune system. Maternal IgG crossing the placenta provides the newborn with immediate antibodies against pathogens the mother has encountered, offering protection at birth that is temporary as these antibodies wane over time. This contrasts with active immunity, where the individual’s immune system responds to an antigen and generates its own antibodies, as happens with vaccination or natural infection. Therefore, maternal IgG transfer is the clear example of passive immunity.

Passive immunity is protection conferred by preformed antibodies received from another person, not produced by the recipient’s own immune system. Maternal IgG crossing the placenta provides the newborn with immediate antibodies against pathogens the mother has encountered, offering protection at birth that is temporary as these antibodies wane over time. This contrasts with active immunity, where the individual’s immune system responds to an antigen and generates its own antibodies, as happens with vaccination or natural infection. Therefore, maternal IgG transfer is the clear example of passive immunity.

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