You asked: Are the promised Covid vaccines once in a lifetime, or do they need to be retaken seasonally?
It's not clear yet, @kavitapmd tells Mehdi, but "we hope that they will have long-lasting immunity."
Nov 13, 2020 · 12:47 AM UTC
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You asked: How are scientists assessing side effects to a Covid vaccine as it’s rushed through?
To answer that, we’re going to need “long-term studies conducted over a period of time,” says @syramadad. “This is information that we're going to find out in the years to come.”
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