UPDATE 1 MAY 2020: Apparently this article I linked to is no longer available at the above listed url. I went to check it out again, after seeing a newer article on another nationally known training center doing this same thing. Again, I will say, I think this is a dangerous road to go down. Here is the newer article; Investigating whether dogs can detect coronavirus
I found this article while perusing a news site. I’m not entirely sure about the particulars.
I’m not sure that I would train any dog under my control for this, at least until more research is done; but then, that’s my own personal opinion.
This link is no longer available. I’m unsure as to why, but I do have my own personal suspicions. https://www.afp.com/en/news/3954/dogs-being-trained-sniff-out-covid-19-charity-doc-1q78e11