This is critical on a number of levels. "Colloi
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"Colloidal Gold is a rapid POC test that uses a drop of blood from a finger prick to determine whether an individual has produced antibodies to in response to COVID-19. "
To see who has and has had.
I believe scientists may even want / need to test people who have recently passed from "flu ike" symptoms to get an overall picture of how wide spread it is.