Question

Edward Jenner’s contribution for the eradication of smallpox is
A. His proposition that smallpox has possibly spread throughout the world from India and china.
B. His discovery of transformation procedure.
C. His finding that rubbing of the skin crust of smallpox victims on the arm of a healthy person would develop resistance against smallpox.
D. His finding that the cowpox infection protects the person from subsequent infection from smallpox.

Answer 1

He showed his analysis in 1796, while he inoculated a boy with cowpox after which uncovered him to smallpox numerous weeks later. He posted his effects in An Inquiry into the Causes and Effects of the Variolae Vaccinae (1798).

Complete answer:
To answer this question, first, we need to know about Edward Jenner’s contribution. Jenner's great contribution to clinical science is his discovery of immunity to smallpox conferred through relatively moderate cowpox from which he advanced the method referred to as vaccination (vacca-a cow).
Now, let us find the solution from the option.
His proposition did not explain that smallpox has possibly spread throughout the world from India and china.
He hypothesized that exposure to cowpox rendered the body immune from smallpox. After almost two decades of experiments, he made the primary vaccine. So, he did not discover any transformation method.
Edward Jenner found that the person that has suffered from cowpox contamination develops immunity in opposition to smallpox. This is because of the improvement of the antibodies in opposition to the contamination in the first reaction which could combat the viruses, stopping contamination for the duration of the second one attack. According to Edward Jenner, the cow-pox contamination protects the character from small-pox because of improvement of greater quantities of antibodies because the secondary reaction.

Hence, the correct answer is option (D)

Note: Jenner started to take a look at the connection among cowpox (a relatively innocent disease) and the greater risky and disfiguring smallpox. He found that dairymaids, a lot of whom had reduced in size cowpox from their exposure to cows, hardly ever got down here with smallpox. He hypothesized that exposure to cowpox rendered the body immune from smallpox. After almost two decades of experiments, he advanced the primary vaccine.