Question

why a person suffering Once from smallpox cannot suffer from it again

Answer 1

Because our immune system gets identifies this type of diseases like smallpox ,after the body suffers it once.Hence we get a permanent immunity against it.

Answer 2

A person suffering from smallpox can not suffer from it again as the WBCs present inside the body develops anti body for the particular disease. And hence,if the body is again attacked by the small pox virus,the body defends itself with the help of that anti body and very rarely our body again gets attacked from smallpox. Hope it will help u...Pls mark as the brainliest. _____________________________