I got mononucleosis when I was 15 or so and was reading up on it recently because why not. The Wikipedia article says the Epstein-Barr virus *usually* causes it but that other viruses can do as well. How would two different viruses cause one disease? Shouldn’t they be two different diseases even if they have similar symptoms?
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Mononucleosis is a symptom, not a disease. Just like a fever or cough, it could have a number of different underlying causes. It’s the result of your immune system responding to something that isn’t supposed to be there. A disease is a collection of symptoms that have a known pattern or cause.
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