Which of the following is an example of passive immunity?

• A. Transfer of antibodies from mother to child through breast milk
• B. Production of antibodies by B-cells
• C. Activation of T-cells by an antigen
• D. Vaccination with a live attenuated virus

Answer: (A)

Verified step by step guidance

1. Understand the concept of passive immunity: Passive immunity involves the transfer of antibodies from one individual to another, providing immediate protection without the recipient's immune system actively producing these antibodies.
2. Identify the examples provided: The options include transfer of antibodies from mother to child through breast milk, production of antibodies by B-cells, activation of T-cells by an antigen, and vaccination with a live attenuated virus.
3. Analyze each option: Consider which options involve the direct transfer of antibodies rather than the body's active immune response.
4. Focus on the transfer of antibodies: Passive immunity is characterized by the direct transfer of antibodies, such as through breast milk, which provides the child with immediate protection.
5. Conclude which option represents passive immunity: The transfer of antibodies from mother to child through breast milk is a classic example of passive immunity, as it involves the direct transfer of antibodies without the child's immune system actively producing them.