Why do we get a lifetime immunity against particular diseases like smallpox ?
Why don't we get immunity against all diseases we have already been through ?
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1You don't get lifetime immunity with vaccination against smallpox– Graham ChiuCommented Mar 26, 2020 at 19:38
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1Welcome to Medical Sciences! Please take the tour and read the help center. For reasons mentioned in this post and in How to Ask, we require some degree of prior research when asking questions. See this list of helpful resources. Please help us to help you and edit your question to provide more information on what you have read on this subject, what made you ask this question, and any problems you are having understanding your research. If you found nothing, what did you Google?– Carey Gregory ♦Commented Mar 26, 2020 at 19:45
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