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If they come out with a Covid vaccine, how effective will it be?

Will it be like the flu vaccine? Many take it and still catch the flu.
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SW-User
It is likely to be effective for around 50 to 60% of people if it's successful. Achieving more than that would be beyond expectation. That's my take on it.
ProfessorPlum77 · 70-79, MVIP
@SW-User Not encouraging.
SW-User
@ProfessorPlum77 that's about normal in most vaccines