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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What we perceive as the disease is often the signs /symptoms caused by the body’s immune response in action
For example, pneumonia is the lungs filling with fluid and keeping a patient from breathing. We can see the fluid in an x ray.
But what caused the fluid? Bacteria? Virus? Other injury or pathogens? They’re all pneumonia and lungs with fluid.
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