This is more a point of interest.
Does anyone know how the test is done these days?
A contact of mine was involved in early testing at the Queen Victoria Hospital, East Grinstead.
There, live animal tissue was used to detect the presence of the antibodies and a fluorescent marker employed to show the reaction.
Apparently this was a highly reliable test.
I wonder what they use to test today, when I hear stories of it having a 50% false negative result.