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The problem with looking at symptomatic and a symptomatic numbers is that the vaccines when they fail tend to produce more asymptomatic cases, and that is what you can see in the data. So they should use total cases. There is a question of how the symptomatic and asymptomatic cases differ in their infectiveness because if they do then the effect on reproduction number will be different than we would expect, and just from newspaper reports that seems to be happening and the vaccines are more effective than would be predicted from the trials. It is a case of if I get covid with no symptoms and I don't infect anyone else, does it matter.

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