Can immunity be reverse-engineered simply by using a blood or tissue sample?

I'm working on a novel, in which a character was given a cutting edge vaccination to a deadly disease. She is now valuable because she was the only one given the vaccine and the research to make more is unavailable. Now some people want to "reverse-engineer" the vaccine by studying her (the one who created the vaccine is gone, by the way).

So...my question is: Is it possible to formulate this vaccine by simply using a blood or tissue sample, or would the character herself need to be available for research?

I'm not a scientist, so I'm only guessing (well, researching and guessing), that it's even possible to reverse-engineer a vaccine. Appreciate any input!

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Can immunity be reverse-engineered simply by using a blood or tissue sample?

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