#9 also little data beyond 35 days. Don’t know how these tests will hold up for longer duration seroprevalence surveys, or testing for infection which might have occured >5 weeks ago. Antibodies will wain and we don't know when.
Not really what I'm seeing in the longitudinal studies. Finland, Switzerland, etc all either maintain a similar % positive or go up week by week
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All IgG have a serum half life around 21 days, so seems unlikely that titers would go below detection within a few weeks specifically in those with mild symptoms.
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