Diseases and Viruses
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Hey /sci/, I come to you with a hypothetical question for a story I want to write.
A disease (or virus, I don't know exactly the definitions?) affects a few people but they are able to find a treatment or cure in time for some of them at least to survive.
The disease then mutates and affects others, much more seriously, and the treatment from before no longer works, but those that had it the first time around are now immune to it.
Does that make biological sense?