If you don't understand those topics, you can't properly understand epidemiology. In any case, I have more formal education than a person who might burn through a doctorate degree. It's spread out, because I went for breadth. But that allows me to see the bigger picture.
A vaccine that prevents symptoms but not infection would not reduce cases at all. I assume this is some sort of misunderstanding of the pertussis vaccine, wherein protection against infection wanes over time despite a long-term benefit in terms of symptoms if you are infected
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> A vaccine that prevents symptoms but not infection would not reduce cases at all. Holy shit. SERIOUSLY?! If there are no symptoms, then by definition there are no cases.
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It does, of course, depend on what we're talking about - chronic diseases don't always have specific definitions in the same way infectious diseases do - but a 'case' of infectious disease is almost always characterized as an infection by the pathogen
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