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How many are example of passive immunity...

How many are example of passive immunity?
P. Vaccination
Q. crossing of antibodies from mother to foetus through the placenta
R. Graft rejection
S. Injections given to patents of snakebite
T. Tetanus antitoxin

A

Two

B

Three

C

Four

D

Five

Text Solution

AI Generated Solution

The correct Answer is:
To determine how many examples of passive immunity are present in the given options, let's analyze each one step by step. 1. **Vaccination (P)**: - Vaccination involves the introduction of antigens into the body to stimulate the immune system to produce antibodies. This process leads to the development of active immunity, as the body produces its own antibodies in response to the vaccine. - **Conclusion**: This is NOT an example of passive immunity. 2. **Crossing of antibodies from mother to fetus through the placenta (Q)**: - This process involves the transfer of maternal antibodies to the fetus, providing the fetus with immediate immunity. Since these antibodies are produced by the mother and transferred to the fetus, this is a classic example of passive immunity. - **Conclusion**: This IS an example of passive immunity. 3. **Graft rejection (R)**: - Graft rejection is a process where the immune system recognizes the transplanted tissue as foreign and mounts an immune response against it. This involves cellular immunity rather than antibody-mediated immunity. - **Conclusion**: This is NOT an example of passive immunity. 4. **Injections given to patients of snakebite (S)**: - In cases of snakebite, patients are often given antivenom, which contains antibodies that neutralize the venom. This is a direct transfer of antibodies into the patient’s body, making it a form of passive immunity. - **Conclusion**: This IS an example of passive immunity. 5. **Tetanus antitoxin (T)**: - Tetanus antitoxin is an injection of antibodies that provides immediate protection against tetanus. Like the snakebite antivenom, this involves the administration of antibodies produced outside the body. - **Conclusion**: This IS an example of passive immunity. Now, let's summarize the findings: - Passive immunity examples: - Q (Crossing of antibodies from mother to fetus) - S (Injections for snakebite) - T (Tetanus antitoxin) Thus, there are **3 examples of passive immunity** in the given options. ### Final Answer: The number of examples of passive immunity is **3**.
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