Re: Important Issue for Immunity Credentials

While few (none?) of us on the mailing list know the details, I think this
is where a governance framework comes in.  Each verifier will want to know
the basis under which the issuer issued the credential.  In a closed
ecosystem (one jurisdiction), that will be easy. In order to accept a
credential from another issuer, a verifier will want to know the science
used by the issuer and decide how from there to trust (or not) the
credentials. The framework for disclosing that information will be needed.
It's a good use case for this as the issuers will be relatively small (at
least initially), as will the ecosystems in which they are used.

On Wed, Apr 8, 2020 at 9:21 AM Xiao Zhang <> wrote:

> IgG antibody is a signal of ‘old’ infection (one had COVID-19 weeks/months
> ago)
> IgM is of current or very recent infection.
> Regards,
> Xiao Zhang
> > 在 2020年4月9日,上午12:14,Steven Rowat <> 写道:
> >
> > On 2020-04-07 11:35 pm, Victoriano Giralt wrote:
> >> From my work with the lab at Kings college, the "good" tests provide a
> >> triplet of ternary results:
> >> Overall "result": Yes/No/unclear
> >> IgM: High/Medium/Low
> >> IgG: High/Medium/Low
> >>
> >> IgM and IgG are the real immunity results showing how long ago it has
> >> developed.
> >
> > Although I'm not a doctor, I can add that yesterday the doctor in NY
> Governor Cuomo's press conference explained that there is a key difference
> between these IgM and IgG, which is that one of them shows past infection,
> and one shows current. He was explaining that an immunity certificate needs
> to reflect this difference accurately in order to show that people are over
> it and do not still have it.
> >
> > If my memory of what he said is correct, he was saying that the test
> they're developing only uses one of them, the one that shows that the
> infection is 'old' and not current, and that this is sufficient and what is
> required for an immunity certificate.
> >
> > Steven
> >
> >


Stephen Curran
Principal, Cloud Compass Computing, Inc. (C3I)
Technical Governance Board Member - Sovrin Foundation (

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Received on Wednesday, 8 April 2020 16:36:17 UTC