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No. That's basic math. A vaccine that can prevent symptoms but not infection would result in a reduction of cases, as vaccination rates increase, up until the point that the total number of cases outweighs the suppression provided by the vaccine.
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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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