Why are here some cures but not adjectives?

1. Has for influenza some strains there is a cure.
2.There is a cure for some virues
3.Has for TB some strains there is a cure


Why is that?
Answers:
there is not a cure for various viruses because they can mutate to look differect to reeceptor cells but still cause alike simptoms.
also some things just aren't meant to be known.
The motivation for some strains of disease not having a cure is because the virus has evolved. In sense it has changed it's makeup and developed an imperviousness to our treatments. Most of the time this happens so fast that we can't come up with a strange vaccine or treatment for this new resilient type of virus.

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