Answer: I think the narrator meant in a non-literal way. He/she may mean that the disease made them more aware of it and knows how to prevent it next time.
May not be 100 percent correct. Wait and see if other people agrees with me.
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B. He considered his disease to be nervousness.
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It is kind of like what happened with this Corona. We heard about the "disease" and became more weary and careful. Also: sharpened our senses.
Explanation: Do you like wolves I ABSOLUTELY LOVE THEM!