This is interesting indeed.
In 2018 Robert Webster (New Zealander) published his book FLU HUNTER
His profile is available at this LINK
We purchased it immediately as its a subject that has long interested us.
I just pulled if from our library to see if I could find any reference to precurses to Covid-19 in his work.
To my astonishment on pages 142 and 143 there it is.
See what you think. We should have seen this coming. So many parallels.
Click on the image to read the larger file.