Question

Question 30 1 pts In times before vaccination (or even Germ theory, for that matter), it was commonly observed that people who worked with dairy cattle tended to not contract smallpox. Edward Jenner famously demonstrated in 1796 that infection with cowpox conferred immunity to smallpox. This phenomenon is a good example of o artificially acquired active immunity O naturally acquired active immunity O artificially acquired passive immunity O naturally acquired passive immunity

Answer 1

Solution:

Correct option- B Natural acquired active immunity

• Natural acquired active immunity-When the immunity develops due to antigens in the course of daily routine or direct exposure. It forms the memory cells and antibodies on infection of antigen and, providing the long term immunity. For example- Development of memory cells for smallpox, due to direct exposure of cowpox virus.
• Artificially acquired active immunity-When the immunity develops as the result of vaccination or immunization. Specially engineered, attenuated antigens are introduced in body for the formation of memory cells and the production of antibodies. It also provides long term immunity. For example- Polio vaccination, BCG vaccination
• Natural acquired passive immunity- When the immunity is due to direct antibodies transfer naturally. For example-transfer of antibodies to the fetus from the mother through the placenta. Short term immunity, till the antibodies, is present.
• Artificially acquired passive immunity: When the immunity is due to passively injecting the pre-formed antibody molecules into the body, For example- Antivenom serum.

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